CN103928769A - Antenna matching method and circuit and electronic device - Google Patents
Antenna matching method and circuit and electronic device Download PDFInfo
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- CN103928769A CN103928769A CN201410114761.XA CN201410114761A CN103928769A CN 103928769 A CN103928769 A CN 103928769A CN 201410114761 A CN201410114761 A CN 201410114761A CN 103928769 A CN103928769 A CN 103928769A
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Abstract
The invention discloses an antenna matching method and circuit and an electronic device. The method comprises the steps that a first frequency band control switch unit is connected with a second capacitive unit or an induction unit; the first capacitive unit is controlled to change capacitive values presented by itself so as to enable the unit connected with the first capacitive unit and the switch unit to conduct impedance matching on an antenna unit, wherein the first frequency band is the frequency band which deviates from the antenna unit and has the resonant frequency not exceeding the first threshold value; a second frequency band controls the switch unit to switch over a unit connected with the switch unit; the first capacitive unit and the unit which is switched over by and connected with the switch unit are controlled to conduct impedance matching on the antenna unit, wherein the second frequency band is the frequency band which deviates from the antenna unit and has the resonant frequency larger than the first threshold value and smaller than the second threshold value, and the second threshold value is larger than the first threshold value. According to the method, when the antenna unit works on a wide frequency band, the performance of the antenna unit is ensured.
Description
Technical field
The present invention relates to the communication technology, relate in particular to a kind of aerial matching method, circuit and electronic equipment.
Background technology
At present, the structure of the mobile terminals such as mobile phone becomes increasingly complex, and the space of leaving antenna for is more and more less.The space of antenna is little means that the bandwidth of antenna can narrow down.Meanwhile, in actual use, owing to will covering multiple different communication standard, antenna often need to cover a plurality of frequency ranges.The general low-frequency range of antenna need to cover 824～960 megahertzes (MHz) at present, and high band need to cover 1710～2170MHz.And along with Long Term Evolution (LTE, Long Term Evolution) comes into the market fast, antenna also needs to cover LTE frequency range.In LTE frequency range, frequency band is minimum to 698MHz.This just means that antenna low-frequency range need to cover 698～960MHz frequency range, and under the steric requirements that antenna can utilize at present, correlation technique is difficult to cover such wide-band.The solution generally adopting is at present to adopt switching device or adjustable device (as tunable capacitor) to regulate antenna, utilizes a plurality of states of antenna to go to realize a wide band covering.
Because the adjustable extent of the tunable capacitor of non-switchtype is conventionally all very limited, if increase the electric capacity regulating ratio of tunable capacitor or adopt switch to regulate, in the situation that frequency departure original resonance frequency is larger, the numerical value of the return loss of antenna (absolute value) can obviously reduce, and has affected the performance of antenna.
Summary of the invention
The embodiment of the present invention provides a kind of aerial matching method, circuit and electronic equipment, when antenna element works in broadband, guarantees the performance of antenna element.
The technical scheme of the embodiment of the present invention is achieved in that
The embodiment of the present invention provides a kind of aerial matching method, be applied to have in the electronic equipment of antenna element and radio frequency unit, described electronic equipment also comprises antenna match unit, and described antenna match unit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described the first capacitive unit is connected with described antenna element, and the second terminal of described the first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
The second terminal of described switch element is connected with the first terminal of described the second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit, described inductive unit, described switch element is supported a unit in the second capacitive unit and described inductive unit described in conducting;
Described method comprises:
In the first frequency range, control described in described switch element conducting inductive unit described in the second capacitive unit or conducting;
The unit of controlling described the first capacitive unit and the conducting of described switch element institute in described the first frequency range, carries out impedance matching to described antenna element; Wherein, described the first frequency range is that the resonance frequency that departs from described antenna element does not surpass the frequency range of first threshold;
In the second frequency range, control the unit that described switch element switches institute's conducting;
The unit of controlling described the first capacitive unit and described switch element institute switched conductive in described the second frequency range carries out impedance matching to described antenna element; Wherein,
Described the second frequency range is that the resonance frequency that departs from described antenna element surpasses described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
The embodiment of the present invention also provides a kind of antenna-matching circuit, is applied to have in the electronic equipment of antenna element and radio frequency unit, and described antenna-matching circuit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described the first capacitive unit is connected with described antenna element, and the second terminal of described the first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
The second terminal of described switch element is connected with the first terminal of described the second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit, described inductive unit, described switch element is supported a unit in the second capacitive unit and described inductive unit described in conducting;
Described antenna-matching circuit also comprises:
Control unit, for controlling described in described switch element conducting inductive unit described in the second capacitive unit or conducting in the first frequency range;
The unit of controlling described the first capacitive unit and the conducting of described switch element institute in described the first frequency range, carries out impedance matching to described antenna element; Wherein, described the first frequency range is that the resonance frequency that departs from described antenna element does not surpass the frequency range of first threshold;
Described control unit, also switches the unit of institute's conducting for control described switch element in the second frequency range;
The unit of controlling described the first capacitive unit and described switch element institute switched conductive in described the second frequency range carries out impedance matching to described antenna element; Wherein,
Described the second frequency range is that the resonance frequency that departs from described antenna element surpasses described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
The embodiment of the present invention also provides a kind of electronic equipment, and described electronic equipment comprises above-described antenna-matching circuit.
In the present embodiment, departing from the frequency range of large (between first threshold and Second Threshold) of antenna element resonance frequency, by switching in the unit (the second capacitive unit or inductive unit) of the heterogeneity impedance that the first frequency range used, input impedance to antenna element is mated, the return loss numerical value (absolute value) of guaranteeing antenna element can obviously not reduce, and has guaranteed the performance of antenna element.
Accompanying drawing explanation
Fig. 1 a is the structural representation of electronic equipment in the embodiment of the present invention one;
Fig. 1 b is the schematic flow sheet of aerial matching method in the embodiment of the present invention one;
Fig. 1 c be in correlation technique antenna element operating frequency and antenna element return loss be related to schematic diagram;
Fig. 1 d be in the embodiment of the present invention one antenna element operating frequency and antenna element return loss be related to schematic diagram;
Fig. 2 a is the structural representation of antenna-matching circuit in the embodiment of the present invention two;
Fig. 2 b be in correlation technique antenna element operating frequency and antenna element return loss be related to schematic diagram;
Fig. 2 c be in the embodiment of the present invention two antenna element operating frequency and antenna element return loss be related to schematic diagram;
Fig. 3 a is the structural representation of electronic equipment in the embodiment of the present invention three;
Fig. 3 b be in correlation technique antenna element operating frequency and antenna element return loss be related to schematic diagram;
Fig. 3 c be in the embodiment of the present invention three antenna element operating frequency and antenna element return loss be related to schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment mono-
The present embodiment is recorded a kind of aerial matching method, be applied in electronic equipment as shown in Figure 1a, described electronic equipment comprises antenna element 11 and radio frequency unit 12, described electronic equipment also comprises antenna match unit 13 and control unit 14, and described antenna match unit 13 comprises: the first capacitive unit 131, switch element 132, the second capacitive unit 133 and inductive unit 134;
The first terminal of described the first capacitive unit 131 is connected with described antenna element 11, and the second terminal of described the first capacitive unit 131 is connected with the first terminal of described radio frequency unit 12 and described switch element 132;
The second terminal of described switch element 132 is connected with the first terminal of described the second capacitive unit 133, the first terminal of described inductive unit 134 respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit 133, described inductive unit 134, described switch element 132 is supported a unit in the second capacitive unit 133 and described inductive unit 134 described in conductings;
In practical application, described control unit 14 can be realized by the baseband chip in electronic equipment; Described switch element 132 can have the electronic devices and components of gating function in electronic equipment to be realized as triode, applies different voltage control signals, with conducting the second capacitive unit 133 or inductive unit 134 by control unit 14 at switch element 132; Described the first capacitive unit 131 can realize by the tunable capacitor in electronic equipment, or the lc circuit being comprised of inductance and tunable capacitor is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be lower than the first frequency range, and described the first frequency range is that the resonance frequency that departs from described antenna element 11 does not surpass the frequency range of first threshold; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be higher than the second frequency range, and described the second frequency range is the frequency range of resonance frequency between first threshold and Second Threshold that departs from described antenna element 11, and described Second Threshold is greater than described first threshold;
Described the second capacitive unit 133 can realize by the electric capacity in electronic equipment, or the lc circuit being comprised of inductance and electric capacity is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be lower than described the first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be higher than described the second frequency range.
Described inductive unit 134 can realize by the inductance in electronic equipment, or the lc circuit of inductance and electric capacity composition is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be higher than described the first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be lower than described the second frequency range.
Inventor finds in implementing process of the present invention, in correlation technique, when realizing electronic equipment to wide band support, departing from the frequency range of antenna element 11 resonance frequencys over first threshold, the numerical value of the return loss of antenna element 11 (absolute value) does not obviously reduce, show the impedance matching of antenna element 11 better, but exceed first threshold departing from antenna element 11 resonance frequencys, the frequency range (described Second Threshold is greater than described first threshold) that does not exceed Second Threshold, the numerical value of the return loss of antenna element 11 (absolute value) obviously reduces, show the impedance matching of antenna element 11 poor, with antenna element 11, be operated in when departing from antenna element 11 resonance frequencys and not surpassing first threshold below, how to make the return loss numerical value of antenna element 11 maintain high value, the input impedance of antenna element 11 carry out optimum Match (make the imaginary part of input impedance approach zero or be zero), and antenna element 11 is operated in and departs from antenna element 11 resonance frequencys and exceed first threshold, while not exceeding Second Threshold, how to make the return loss numerical value of antenna element 14 maintain high value, the input impedance of antenna element 11 being carried out to optimum Match describes.
As shown in Figure 1 b, the aerial matching method that the present embodiment is recorded comprises the following steps:
Step 101, controls described in described switch element 132 conductings inductive unit 134 described in the second capacitive unit 133 or conducting in the first frequency range.
In practical application, switch element 132 conducting the second capacitive unit 133 or conducting inductive unit 134, can be according in the first frequency range, the first capacitive unit 131 and 133 pairs of antenna elements of the second capacitive unit 11 carry out impedance matching (make antenna element 11 impedance approach zero or be zero) time antenna element 11 return loss (being made as the first return loss), and the first capacitive unit 131 while carrying out impedance matching with 134 pairs of antenna elements of inductive unit 11 return loss (being made as the second return loss) of antenna element 11 determine; For example, in the first frequency range, when the numerical value of the first return loss (absolute value) is greater than the numerical value of the second return loss, because the return loss numerical value of antenna element 11 is larger, illustrate that standing wave is less, the efficiency that signal transmits is higher, therefore, and control switch unit 132 conducting the first capacitive unit 131 in step 101;
Correspondingly, in the first frequency range, if the numerical value of the first return loss is less than the numerical value of the second return loss, control switch unit 132 conducting the second capacitive unit 133 in step 101.
Step 102, controls described the first capacitive unit 131 and changes the capacitance self presenting, so that the unit of described the first capacitive unit 131 and 132 conductings of described switch element carries out impedance matching to described antenna element 11.
In practical application, the capacitance of the first capacitive unit 131 applies different voltage control signals by control unit 14 in the first capacitive unit 131 and realizes.
Step 103, controls described switch element 132 in the second frequency range and switches the unit of institute's conducting.
Step 104, controls described the first capacitive unit 131, with the unit of 132 switched conductive of described switch element, described antenna element 11 is carried out to impedance matching.
Wherein, described the second frequency range is that the resonance frequency that departs from described antenna element 11 surpasses described first threshold and is less than the frequency range of Second Threshold.
Conducting the second capacitive unit 133 in step 101 of take is example, and inventor implements to find in process of the present invention, in the first frequency range, the numerical value of the first return loss is during higher than the second return loss numerical value, correspondingly, in the second frequency range, the numerical value of the first return loss, by the numerical value lower than the second return loss; That is to say, control unit 14 control switch unit 132 switch in the unit of step 101 conducting, will make antenna element 11 have larger return loss in the second frequency range, antenna element 11 are realized to optimum Match in the input of the second frequency range.
Form due to the first capacitive unit 131 employing tunable capacitors, therefore, in the present embodiment, control unit 14 can be by applying different voltage control signals in described the first capacitive unit 131, the capacitance self being presented to change the first capacitive unit 131, thereby can with the unit of 132 switched conductive of switch element described in control unit 14, jointly described antenna element 11 is carried out to impedance matching in the second frequency range.
For the beneficial effect that illustrates that the present embodiment brings, inventor is to supporting the electronic equipment of 698-960MHz frequency range in correlation technique, and the electronic equipment of implementing technical solution of the present invention is tested, Fig. 1 c is while realizing electronic equipment support 698-960MHz frequency range in correlation technique, the operating frequency of antenna element and the schematic diagram of antenna return loss, from Fig. 1 c, can find out, frequency range f1～the f2 that does not exceed first threshold at deflects electrons device antenna unit resonance frequency, the return loss of antenna element is for obviously reducing, but exceed first threshold departing from antenna element 11 resonance frequencys, frequency range f2～the f3 that does not exceed Second Threshold, the return loss of antenna element 11 occurs obviously to reduce, had a strong impact on the performance of antenna element,
When Fig. 1 d is the electronic equipment support 698-960MHz frequency range of the present embodiment record, the operating frequency of antenna element 11 and the schematic diagram of antenna return loss, as shown in Figure 1 d, frequency range f1～the f2 that does not exceed first threshold in deflects electrons device antenna unit 11 resonance frequencys, and depart from frequency range f2～f3 that antenna element 11 resonance frequencys exceed first threshold, do not exceed Second Threshold, the return loss of antenna element 11 (corresponding ordinate) does not occur obviously to reduce, and has proved feasibility and the validity of the present embodiment technical scheme; First threshold described in the present embodiment and Second Threshold are determined according to the situation of change of the return loss of antenna element in correlation technique 11, for example, the return loss of antenna element 11 can be reduced to the frequency range of relatively little (being no more than 2 decibels as reduced), as the frequency range that departs from antenna element 11 resonance frequencys and do not exceed first threshold; The return loss of antenna element 11 is reduced to the frequency range of relatively large (surpassing 2 decibels as reduced), as departing from the frequency range of antenna element 11 resonance frequencys between first threshold and Second Threshold.
In the present embodiment, departing from the frequency range of large (between first threshold and Second Threshold) of antenna element resonance frequency, by switching in the unit (the second capacitive unit 131 or inductive unit 134) of the heterogeneity impedance that the first frequency range used, input impedance to antenna element 11 is mated, the return loss numerical value (absolute value) of guaranteeing antenna element 11 can obviously not reduce, and has guaranteed the performance of antenna element 11.
Embodiment bis-
The present embodiment is recorded a kind of antenna-matching circuit, be applied in electronic equipment as shown in Figure 2 a, described electronic equipment comprises antenna element 21 and radio frequency unit 22, described electronic equipment also comprises antenna-matching circuit 23 and control unit 24, and described antenna-matching circuit 23 comprises: the first capacitive unit 231, switch element 232, the second capacitive unit 233 and inductive unit 234;
The first terminal of described the first capacitive unit 231 is connected with described antenna element 21, and the second terminal of described the first capacitive unit 231 is connected with the first terminal of described radio frequency unit 22 and described switch element 232;
The second terminal of described switch element 232 is connected with the first terminal of described the second capacitive unit 233, the first terminal of described inductive unit 234 respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit 233, described inductive unit 234, described switch element 232 is supported a unit in the second capacitive unit 233 and described inductive unit 234 described in conductings;
In practical application, described control unit 24 can be realized by the baseband chip in electronic equipment; Described switch element 232 can have the electronic devices and components of gating function in electronic equipment to be realized as triode, applies different voltage control signals, with conducting the second capacitive unit 233 or inductive unit 234 by control unit 24 at switch element 232; Described the first capacitive unit 231 can realize by the tunable capacitor in electronic equipment, or the lc circuit being comprised of inductance and tunable capacitor is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be lower than the first frequency range, and described the first frequency range is that the resonance frequency that departs from described antenna element 21 does not surpass the frequency range of first threshold; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be higher than the second frequency range, and described the second frequency range is the frequency range of resonance frequency between first threshold and Second Threshold that departs from described antenna element 21, and described Second Threshold is greater than described first threshold;
Described the second capacitive unit 233 can realize by the electric capacity in electronic equipment, or the lc circuit being comprised of inductance and electric capacity is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be lower than described the first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be higher than described the second frequency range.
Described inductive unit 234 can realize by the inductance in electronic equipment, or the lc circuit of inductance and electric capacity composition is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be higher than described the first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be lower than described the second frequency range.
Inventor finds in implementing process of the present invention, in correlation technique, when realizing electronic equipment to wide band support, departing from the frequency range of antenna element 21 resonance frequencys over first threshold, the numerical value of the return loss of antenna element 21 (absolute value) does not obviously reduce, show the impedance matching of antenna element 21 better, but exceed first threshold departing from antenna element 21 resonance frequencys, the frequency range (described Second Threshold is greater than described first threshold) that does not exceed Second Threshold, the numerical value of the return loss of antenna element 21 (absolute value) obviously reduces, show the impedance matching of antenna element 21 poor, with antenna element 21, be operated in when departing from antenna element 21 resonance frequencys and not surpassing first threshold below, how to make the return loss numerical value of antenna element 21 maintain high value, the input impedance of antenna element 21 carry out optimum Match (make the imaginary part of input impedance approach zero or be zero), and antenna element 21 is operated in and departs from antenna element 21 resonance frequencys and exceed first threshold, while not exceeding Second Threshold, how to make the return loss numerical value of antenna element 24 maintain high value, the input impedance of antenna element 21 being carried out to optimum Match describes.
Antenna-matching circuit as shown in Figure 2 a, wherein,
Described control unit 24, for controlling described in described switch element 232 conductings inductive unit 234 described in the second capacitive unit 233 or conducting in the first frequency range.
In practical application, switch element 232 conducting the second capacitive unit 233 or conducting inductive unit 234, can be according in the first frequency range, the first capacitive unit 231 and 233 pairs of antenna elements of the second capacitive unit 21 carry out impedance matching (make antenna element 21 impedance approach zero or be zero) time antenna element 21 return loss (being made as the first return loss), and the first capacitive unit 231 while carrying out impedance matching with 234 pairs of antenna elements of inductive unit 21 return loss (being made as the second return loss) of antenna element 21 determine; For example, in the first frequency range, when the numerical value of the first return loss (absolute value) is greater than the numerical value of the second return loss, because the return loss numerical value of antenna element 21 is larger, illustrate that standing wave is less, the efficiency that signal transmits is higher, therefore, and control unit 24 control switch unit 232 conducting the first capacitive unit 231;
Correspondingly, in the first frequency range, if the numerical value of the first return loss is less than the numerical value of the second return loss, control unit 24 control switch unit 232 conducting the second capacitive unit 233.
Described control unit 24, also, for control the unit of described the first capacitive unit 231 and 232 conductings of described switch element in described the first frequency range, carries out impedance matching to described antenna element 21.
Described control unit 24, also when controlling described in described switch element 232 conductings the second capacitive unit 233 in described the first frequency range, control described the first capacitive unit 231 and change the capacitance self presenting, make described the first capacitive unit 231 and described the second capacitive unit 233 to described antenna element 21, carry out impedance matching in described the first frequency range, so that the first return loss is greater than the second return loss;
Described control unit 24, also when controlling described in described switch element 232 conductings inductive unit 234 in described the first frequency range, control described the first capacitive unit 231 and change the capacitance self presenting, make described the first capacitive unit 231 and described inductive unit 234 to described antenna element 21, carry out impedance matching in described the first frequency range, so that described the second return loss is greater than described the first return loss; Wherein,
Described the first return loss is for utilizing described the first capacitive unit 231 and described the second capacitive unit 233 when described the first frequency range is carried out impedance matching to described antenna element 21, the return loss of described antenna element 21; Described the second return loss is for utilizing described the first capacitive unit 231 and described inductive unit 234 when described the first frequency range is carried out impedance matching to described antenna element 21, the return loss of described antenna element 21.
In practical application, the capacitance of the first capacitive unit 231 applies different voltage control signals by control unit 24 in the first capacitive unit 231 and realizes.
Described control unit 24, also switches the unit of institute's conducting for control described switch element 232 in the second frequency range.
Described control unit 24, also carries out impedance matching with the unit of 232 switched conductive of described switch element to described antenna element 21 for control described the first capacitive unit 231 in described the second frequency range.
Described control unit 24, also for control described the first capacitive unit 231 in described the second frequency range, change the capacitance self presenting, and control the unit of described the first capacitive unit 231 and 232 switched conductive of described switch element, described antenna element 21 is carried out to impedance matching.
Wherein, described the second frequency range is that the resonance frequency that departs from described antenna element 21 surpasses described first threshold and is less than the frequency range of Second Threshold.
The control unit 24 of take is example in first frequency range conducting the second capacitive unit 233, inventor implements to find in process of the present invention, in the first frequency range, the numerical value of the first return loss is during higher than the second return loss numerical value, correspondingly in the second frequency range, the numerical value of the first return loss, by the numerical value lower than the second return loss; That is to say, control unit 24 control switch unit 232 switch in the unit of the first frequency range institute conducting, will make antenna element 21 have larger return loss in the second frequency range, antenna element 21 are realized to optimum Match in the input of the second frequency range.
Form due to the first capacitive unit 231 employing tunable capacitors, therefore, in the present embodiment, control unit 24 can be by applying different voltage control signals in described the first capacitive unit 231, the capacitance self being presented to change the first capacitive unit 231, thereby can with the unit of 232 switched conductive of switch element described in control unit 24, jointly described antenna element 21 is carried out to impedance matching in the second frequency range.
For the beneficial effect that illustrates that the present embodiment brings, inventor is to supporting the electronic equipment of 698-960MHz frequency range in correlation technique, and the electronic equipment of implementing technical solution of the present invention is tested, Fig. 2 b is while realizing electronic equipment support 698-960MHz frequency range in correlation technique, the operating frequency of antenna element and the schematic diagram of antenna return loss, from Fig. 2 b, can find out, frequency range f1～the f2 that does not exceed first threshold at deflects electrons device antenna unit resonance frequency, the return loss of antenna element is for obviously reducing, but exceed first threshold departing from antenna element 21 resonance frequencys, frequency range f2～the f3 that does not exceed Second Threshold, the return loss of antenna element 21 occurs obviously to reduce, had a strong impact on the performance of antenna element,
When Fig. 2 c is the electronic equipment support 698-960MHz frequency range of the present embodiment record, the operating frequency of antenna element 21 and the schematic diagram of antenna return loss, as shown in Figure 2 c, frequency range f1～the f2 that does not exceed first threshold in deflects electrons device antenna unit 21 resonance frequencys, and depart from frequency range f2～f3 that antenna element 21 resonance frequencys exceed first threshold, do not exceed Second Threshold, the return loss of antenna element 21 (corresponding ordinate) does not occur obviously to reduce, and has proved feasibility and the validity of the present embodiment technical scheme; First threshold described in the present embodiment and Second Threshold are determined according to the situation of change of the return loss of antenna element in correlation technique 21, for example, the return loss of antenna element 21 can be reduced to the frequency range of relatively little (being no more than 2 decibels as reduced), as the frequency range that departs from antenna element 21 resonance frequencys and do not exceed first threshold; The return loss of antenna element 21 is reduced to the frequency range of relatively large (surpassing 2 decibels as reduced), as departing from the frequency range of antenna element 21 resonance frequencys between first threshold and Second Threshold.
In the present embodiment, departing from the frequency range of large (between first threshold and Second Threshold) of antenna element resonance frequency, by switching in the unit (the second capacitive unit 231 or inductive unit 234) of the heterogeneity impedance that the first frequency range used, input impedance to antenna element 21 is mated, the return loss numerical value (absolute value) of guaranteeing antenna element 21 can obviously not reduce, and has guaranteed the performance of antenna element 21.
Embodiment tri-
The present embodiment is recorded a kind of electronic equipment, as shown in Figure 3 a, described electronic equipment comprises antenna element 31 and radio frequency unit 32, described electronic equipment also comprises antenna-matching circuit 33 and control unit 34, and described antenna-matching circuit 33 comprises: the first capacitive unit 331, switch element 332, the second capacitive unit 333 and inductive unit 334;
The first terminal of described the first capacitive unit 331 is connected with described antenna element 31, and the second terminal of described the first capacitive unit 331 is connected with the first terminal of described radio frequency unit 32 and described switch element 332;
The second terminal of described switch element 332 is connected with the first terminal of described the second capacitive unit 333, the first terminal of described inductive unit 334 respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit 333, described inductive unit 334, described switch element 332 is supported a unit in the second capacitive unit 333 and described inductive unit 334 described in conductings;
In practical application, described control unit 34 can be realized by the baseband chip in electronic equipment; Described switch element 332 can have the electronic devices and components of gating function in electronic equipment to be realized as triode, applies different voltage control signals, with conducting the second capacitive unit 333 or inductive unit 334 by control unit 34 at switch element 332; Described the first capacitive unit 331 can realize by the tunable capacitor in electronic equipment, or the lc circuit being comprised of inductance and tunable capacitor is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be lower than the first frequency range, and described the first frequency range is that the resonance frequency that departs from described antenna element 31 does not surpass the frequency range of first threshold; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be higher than the second frequency range, and described the second frequency range is the frequency range of resonance frequency between first threshold and Second Threshold that departs from described antenna element 31, and described Second Threshold is greater than described first threshold;
Described the second capacitive unit 333 can realize by the electric capacity in electronic equipment, or the lc circuit being comprised of inductance and electric capacity is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be lower than described the first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be higher than described the second frequency range.
Described inductive unit 334 can realize by the inductance in electronic equipment, or the lc circuit of inductance and electric capacity composition is realized; When adopting LC parallel circuits to realize, the resonance frequency of lc circuit need be higher than described the first frequency range; When adopting LC series circuit to realize, the resonance frequency of lc circuit need be lower than described the second frequency range.
Inventor finds in implementing process of the present invention, in correlation technique, when realizing electronic equipment to wide band support, departing from the frequency range of antenna element 31 resonance frequencys over first threshold, the numerical value of the return loss of antenna element 31 (absolute value) does not obviously reduce, show the impedance matching of antenna element 31 better, but exceed first threshold departing from antenna element 31 resonance frequencys, the frequency range (described Second Threshold is greater than described first threshold) that does not exceed Second Threshold, the numerical value of the return loss of antenna element 31 (absolute value) obviously reduces, show the impedance matching of antenna element 31 poor, with antenna element 31, be operated in when departing from antenna element 31 resonance frequencys and not surpassing first threshold below, how to make the return loss numerical value of antenna element 31 maintain high value, the input impedance of antenna element 31 carry out optimum Match (make the imaginary part of input impedance approach zero or be zero), and antenna element 31 is operated in and departs from antenna element 31 resonance frequencys and exceed first threshold, while not exceeding Second Threshold, how to make the return loss numerical value of antenna element 34 maintain high value, the input impedance of antenna element 31 being carried out to optimum Match describes.
Electronic equipment as shown in Figure 3 a, wherein,
Described control unit 34, for controlling described in described switch element 332 conductings inductive unit 334 described in the second capacitive unit 333 or conducting in the first frequency range.
In practical application, switch element 332 conducting the second capacitive unit 333 or conducting inductive unit 334, can be according in the first frequency range, the first capacitive unit 331 and 333 pairs of antenna elements of the second capacitive unit 31 carry out impedance matching (make antenna element 31 impedance approach zero or be zero) time antenna element 31 return loss (being made as the first return loss), and the first capacitive unit 331 while carrying out impedance matching with 334 pairs of antenna elements of inductive unit 31 return loss (being made as the second return loss) of antenna element 31 determine; For example, in the first frequency range, when the numerical value of the first return loss (absolute value) is greater than the numerical value of the second return loss, because the return loss numerical value of antenna element 31 is larger, illustrate that standing wave is less, the efficiency that signal transmits is higher, therefore, and control unit 34 control switch unit 332 conducting the first capacitive unit 331;
Correspondingly, in the first frequency range, if the numerical value of the first return loss is less than the numerical value of the second return loss, control unit 34 control switch unit 332 conducting the second capacitive unit 333.
Described control unit 34, also, for controlling the unit of described the first capacitive unit 331 and 332 conductings of described switch element, carries out impedance matching to described antenna element 31.
Described control unit 34, also when controlling described in described switch element 332 conductings the second capacitive unit 333 in described the first frequency range, control described the first capacitive unit 331 and change the capacitance self presenting, make described the first capacitive unit 331 and described the second capacitive unit 333 to described antenna element 31, carry out impedance matching in described the first frequency range, so that the first return loss is greater than the second return loss;
Described control unit 34, also when controlling described in described switch element 332 conductings inductive unit 334 in described the first frequency range, control described the first capacitive unit 331 and change the capacitance self presenting, make described the first capacitive unit 331 and described inductive unit 334 to described antenna element 31, carry out impedance matching in described the first frequency range, so that described the second return loss is greater than described the first return loss; Wherein,
Described the first return loss is for utilizing described the first capacitive unit 331 and described the second capacitive unit 333 when described the first frequency range is carried out impedance matching to described antenna element 31, the return loss of described antenna element 31; Described the second return loss is for utilizing described the first capacitive unit 331 and described inductive unit 334 when described the first frequency range is carried out impedance matching to described antenna element 31, the return loss of described antenna element 31.
In practical application, the capacitance of the first capacitive unit 331 applies different voltage control signals by control unit 34 in the first capacitive unit 331 and realizes.
Described control unit 34, also switches the unit of institute's conducting for control described switch element 332 in the second frequency range.
Described control unit 34, also carries out impedance matching with the unit of 332 switched conductive of described switch element to described antenna element 31 for control described the first capacitive unit 331 in described the second frequency range.
Described control unit 34, also for control described the first capacitive unit 331 in described the second frequency range, change the capacitance self presenting, and control the unit of described the first capacitive unit 331 and 332 switched conductive of described switch element, described antenna element 31 is carried out to impedance matching.
Wherein, described the second frequency range is that the resonance frequency that departs from described antenna element 31 surpasses described first threshold and is less than the frequency range of Second Threshold.
The control unit 34 of take is example in first frequency range conducting the second capacitive unit 333, inventor implements to find in process of the present invention, in the first frequency range, the numerical value of the first return loss is during higher than the second return loss numerical value, correspondingly in the second frequency range, the numerical value of the first return loss, by the numerical value lower than the second return loss; That is to say, control unit 34 control switch unit 332 switch in the unit of the first frequency range institute conducting, will make antenna element 31 have larger return loss in the second frequency range, antenna element 31 are realized to optimum Match in the input of the second frequency range.
Form due to the first capacitive unit 331 employing tunable capacitors, therefore, in the present embodiment, control unit 34 can be by applying different voltage control signals in described the first capacitive unit 331, the capacitance self being presented to change the first capacitive unit 331, thereby can with the unit of 332 switched conductive of switch element described in control unit 34, jointly described antenna element 31 is carried out to impedance matching in the second frequency range.
For the beneficial effect that illustrates that the present embodiment brings, inventor is to supporting the electronic equipment of 698-960MHz frequency range in correlation technique, and the electronic equipment of implementing technical solution of the present invention is tested, Fig. 3 b is while realizing electronic equipment support 698-960MHz frequency range in correlation technique, the operating frequency of antenna element and the schematic diagram of antenna return loss, from Fig. 3 b, can find out, frequency range f1～the f2 that does not exceed first threshold at deflects electrons device antenna unit resonance frequency, the return loss of antenna element is for obviously reducing, but exceed first threshold departing from antenna element 31 resonance frequencys, frequency range f2～the f3 that does not exceed Second Threshold, the return loss of antenna element 31 occurs obviously to reduce, had a strong impact on the performance of antenna element,
When Fig. 3 c is the electronic equipment support 698-960MHz frequency range of the present embodiment record, the operating frequency of antenna element 31 and the schematic diagram of antenna return loss, as shown in Figure 3 c, frequency range f1～the f2 that does not exceed first threshold in deflects electrons device antenna unit 31 resonance frequencys, and depart from frequency range f2～f3 that antenna element 31 resonance frequencys exceed first threshold, do not exceed Second Threshold, the return loss of antenna element 31 (corresponding ordinate) does not occur obviously to reduce, and has proved feasibility and the validity of the present embodiment technical scheme; First threshold described in the present embodiment and Second Threshold are determined according to the situation of change of the return loss of antenna element in correlation technique 31, for example, the return loss of antenna element 31 can be reduced to the frequency range of relatively little (being no more than 2 decibels as reduced), as the frequency range that departs from antenna element 31 resonance frequencys and do not exceed first threshold; The return loss of antenna element 31 is reduced to the frequency range of relatively large (surpassing 2 decibels as reduced), as departing from the frequency range of antenna element 31 resonance frequencys between first threshold and Second Threshold.
In the present embodiment, departing from the frequency range of large (between first threshold and Second Threshold) of antenna element resonance frequency, by switching in the unit (the second capacitive unit 331 or inductive unit 334) of the heterogeneity impedance that the first frequency range used, input impedance to antenna element 31 is mated, the return loss numerical value (absolute value) of guaranteeing antenna element 31 can obviously not reduce, and has guaranteed the performance of antenna element 31.
In the several embodiment that provide in the application, should be understood that disclosed equipment and method can realize by another way.Apparatus embodiments described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual realization, can there is other dividing mode, as: a plurality of unit or assembly can be in conjunction with, maybe can be integrated into another system, or some features can ignore, or do not carry out.In addition, coupling each other of each shown or discussed part or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of equipment or unit or communication connection can be electrical, machinery or other form.
The above-mentioned unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, also can be distributed in a plurality of network element; Can select according to the actual needs part or all of unit wherein to realize the object of the present embodiment scheme.
In addition, each functional unit in various embodiments of the present invention can all be integrated in a processing unit, can be also that each unit is distinguished separately as a unit, also can be integrated in a unit two or more unit; Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that also can adopt hardware to add application function unit realizes.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as movable storage device, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CDs.
Or, if the above-mentioned integrated unit of the present invention usings that the form of applied function module realizes and during as production marketing independently or use, also can be stored in a computer read/write memory medium.Understanding based on such, the part that the technical scheme of the embodiment of the present invention contributes to prior art in essence in other words can embody with the form of application product, these computer application products are stored in a storage medium, comprise that some instructions are used so that method is all or part of described in each embodiment of a computer equipment (can be personal computer, service or the network equipment etc.) execution the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as movable storage device, ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (11)
1. an aerial matching method, be applied to have in the electronic equipment of antenna element and radio frequency unit, it is characterized in that, described electronic equipment also comprises antenna match unit, and described antenna match unit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described the first capacitive unit is connected with described antenna element, and the second terminal of described the first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
The second terminal of described switch element is connected with the first terminal of described the second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit, described inductive unit, described switch element is supported a unit in the second capacitive unit and described inductive unit described in conducting;
Described method comprises:
In the first frequency range, control described in described switch element conducting inductive unit described in the second capacitive unit or conducting;
The unit of controlling described the first capacitive unit and the conducting of described switch element institute in described the first frequency range, carries out impedance matching to described antenna element; Wherein, described the first frequency range is that the resonance frequency that departs from described antenna element does not surpass the frequency range of first threshold;
In the second frequency range, control the unit that described switch element switches institute's conducting;
The unit of controlling described the first capacitive unit and described switch element institute switched conductive in described the second frequency range carries out impedance matching to described antenna element; Wherein,
Described the second frequency range is that the resonance frequency that departs from described antenna element surpasses described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
2. method according to claim 1, it is characterized in that, when control described switch element conducting in the first frequency range described in during the second capacitive unit, the described unit of controlling described the first capacitive unit and the conducting of described switch element institute in described the first frequency range, described antenna element is carried out to impedance matching, comprising:
Control described the first capacitive unit and change the capacitance self presenting, make described the first capacitive unit and described the second capacitive unit to described antenna element, carry out impedance matching in described the first frequency range, so that the first return loss is greater than the second return loss; Wherein,
Described the first return loss is for utilizing described the first capacitive unit and described the second capacitive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element; Described the second return loss is for utilizing described the first capacitive unit and described inductive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element.
3. method according to claim 1, it is characterized in that, when control described switch element conducting in the first frequency range described in during inductive unit, the described unit of controlling described the first capacitive unit and the conducting of described switch element institute in described the first frequency range, described antenna element is carried out to impedance matching, comprising:
Control described the first capacitive unit and change the capacitance self presenting, make described the first capacitive unit and described inductive unit to described antenna element, carry out impedance matching in described the first frequency range, so that the second return loss is greater than the first return loss; Wherein,
Described the first return loss is for utilizing described the first capacitive unit and described the second capacitive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element; Described the second return loss is for utilizing described the first capacitive unit and described inductive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element.
4. method according to claim 1, is characterized in that, the described unit of controlling described the first capacitive unit and described switch element institute switched conductive in described the second frequency range, carries out impedance matching to described antenna element, comprising:
In described the second frequency range, control described the first capacitive unit and change the capacitance self presenting;
The unit of controlling described the first capacitive unit and described switch element institute switched conductive, carries out impedance matching to described antenna element.
5. according to the method described in claim 1 to 4 any one, it is characterized in that,
The type of described the first capacitive unit comprises: adjustable electric perhaps presents the circuit of capacitive;
The type of described the second capacitive unit comprises: electric capacity or present the circuit of capacitive;
The type of described inductive unit comprises: inductance or present perceptual circuit.
6. an antenna-matching circuit, is applied to have in the electronic equipment of antenna element and radio frequency unit, it is characterized in that, described antenna-matching circuit comprises: the first capacitive unit, switch element, the second capacitive unit and inductive unit;
The first terminal of described the first capacitive unit is connected with described antenna element, and the second terminal of described the first capacitive unit is connected with the first terminal of described radio frequency unit and described switch element;
The second terminal of described switch element is connected with the first terminal of described the second capacitive unit, the first terminal of described inductive unit respectively, and the equal ground connection of the second terminal of the second terminal of described the second capacitive unit, described inductive unit, described switch element is supported a unit in the second capacitive unit and described inductive unit described in conducting;
Described antenna-matching circuit also comprises:
Control unit, for controlling described in described switch element conducting inductive unit described in the second capacitive unit or conducting in the first frequency range;
The unit of controlling described the first capacitive unit and the conducting of described switch element institute, carries out impedance matching to described antenna element; Wherein, described the first frequency range is that the resonance frequency that departs from described antenna element does not surpass the frequency range of first threshold;
Described control unit, also switches the unit of institute's conducting for control described switch element in the second frequency range;
The unit of controlling described the first capacitive unit and described switch element institute switched conductive in described the second frequency range carries out impedance matching to described antenna element; Wherein,
Described the second frequency range is that the resonance frequency that departs from described antenna element surpasses described first threshold and is less than the frequency range of Second Threshold, and described Second Threshold is greater than described first threshold.
7. antenna-matching circuit according to claim 6, is characterized in that,
Described control unit, also for described in described the first frequency range is controlled described switch element conducting during the second capacitive unit, control described the first capacitive unit and change the capacitance self presenting, make described the first capacitive unit and described the second capacitive unit to described antenna element, carry out impedance matching in described the first frequency range, so that the first return loss is greater than the second return loss; Wherein,
Described the first return loss is for utilizing described the first capacitive unit and described the second capacitive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element; Described the second return loss is for utilizing described the first capacitive unit and described inductive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element.
8. antenna-matching circuit according to claim 6, is characterized in that,
Described control unit, also for described in described the first frequency range is controlled described switch element conducting during inductive unit, control described the first capacitive unit and change the capacitance self presenting, make described the first capacitive unit and described inductive unit to described antenna element, carry out impedance matching in described the first frequency range, so that described the second return loss is greater than described the first return loss; Wherein,
Described the first return loss is for utilizing described the first capacitive unit and described the second capacitive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element; Described the second return loss is for utilizing described the first capacitive unit and described inductive unit when described the first frequency range is carried out impedance matching to described antenna element, the return loss of described antenna element.
9. antenna-matching circuit according to claim 6, is characterized in that,
Described control unit, also changes for control described the first capacitive unit in described the second frequency range the capacitance self presenting, and controls the unit of described the first capacitive unit and described switch element institute switched conductive, and described antenna element is carried out to impedance matching.
10. according to the antenna-matching circuit described in claim 6 to 9 any one, it is characterized in that,
The type of described the first capacitive unit comprises: adjustable electric perhaps presents the circuit of capacitive;
The type of described the second capacitive unit comprises: electric capacity or present the circuit of capacitive;
The type of described inductive unit comprises: inductance or present perceptual circuit.
11. 1 kinds of electronic equipments, comprise the antenna-matching circuit described in claim 6 to 10 any one.
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