WO2017024669A1

WO2017024669A1 - Combined antenna system and mobile terminal

Info

Publication number: WO2017024669A1
Application number: PCT/CN2015/091365
Authority: WO
Inventors: 姚德才; 杨攀
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2015-08-12
Filing date: 2015-09-30
Publication date: 2017-02-16
Also published as: CN105006645A

Abstract

Provided are a combined antenna system and a mobile terminal. The combined antenna system comprises: a metal shell arranged at the rear part of a mobile terminal and a multi-interval tunable antenna, wherein the metal shell comprises a first side shell, a middle shell and a first gap arranged between the first side shell and the middle shell, and the multi-interval tunable antenna covers a low frequency band, a middle frequency band and a high frequency band at the same time, and comprises a first metal wire and a second metal wire, with the first metal wire being electrically connected to the first side shell and a radio frequency power supply inside the mobile terminal respectively, the second metal wire and the first metal wire being arranged at an interval, and the second metal wire being electrically connected to the first side shell. The combined antenna system provided by the present invention matches an all-metal shell, and can realize coupling tuning by adjusting the size of a coupling interval on a first metal wire and a second metal wire, thereby relatively improving the radiation efficiency of a product, and enabling the product to meet performance requirements of various network standards of a mobile terminal in the future.

Description

Combined antenna system and mobile terminal

Technical field

The present invention relates to the field of wireless communication technologies, and in particular to a combined antenna system and a mobile terminal having the combined antenna system.

Background technique

In the mobile terminal equipment industry such as mobile phones and tablet computers, as the user's experience requirements for the appearance and feel of the products continue to increase, the metal touch mobile products with good touch and excellent wear resistance become the mainstream of consumption in the industry. However, due to the special shielding performance of the metal back shell and metal frame decoration, the reliability of the antenna is seriously reduced. Therefore, in line with the development trend of the product, the design of the antenna is higher for the major manufacturers. Claim.

In order to solve the technical problem, an antenna system composed of a PIFA/slot antenna is proposed in the prior art, and the system controls the on and off of the grounding point through a switch on the circuit board to generate a required frequency band, but a large number of switch structures in the radio frequency link The introduction increases the additional loss of the antenna system, thereby reducing the radiation efficiency of the antenna system; in addition, the system has a large dependence on the feed/land position and the length and width of the whole machine, and the height of both sides of the feed is high. There is a deep mutual influence between the frequency branch and the low frequency branch. Since the resonant frequency of the antenna system itself is not easy to debug, any size deviation occurring in the production process will cause the resonance frequency of the antenna system to shift. The loss of the antenna system is increased, and on the other hand, the stability of the high frequency and ultra high frequency parts of the antenna is easily reduced, and the frequency bands of the high frequency and the ultra high frequency are narrowed, thereby reducing the reliability of the whole product.

Summary of the invention

In order to solve at least one of the above technical problems, it is an object of the present invention to provide a combined antenna system that can match a full metal casing, has high radiation efficiency, and can cover a high frequency band, a medium frequency band, and a low frequency band.

Another object of the present invention is to provide a mobile terminal having the above combined antenna system.

To achieve the above object, an embodiment of the first aspect of the present invention provides a combined antenna system for a mobile terminal, including: a metal case disposed at a rear portion of the mobile terminal, and the metal case includes a first side case a middle case and a first gap disposed between the first side shell and the middle case; a multi-interval tunable antenna covering the low frequency band, the middle frequency band and the high frequency band, including: the first metal trace, respectively Electrically connecting with the first side shell and the RF feed source inside the mobile terminal; and the second metal trace, spaced apart from the first metal trace, and the second metal trace and the The first side of the shell is electrically connected.

It should be noted that, in the present scheme, the low frequency band refers to a frequency of 0.68 GHz to 1 GHz, the middle frequency band refers to a frequency of 1.5 GHz to 2.2 GHz, and the high frequency band refers to a frequency of 2.2 GHz to 2.7 GHz.

The combined antenna system provided by the embodiment of the first aspect of the present invention utilizes the first side shell as the radiation main body, thereby solving the problem that the antenna and the metal coexist in a large area, thereby realizing the matching of the product with the full metal outer shell, and further, the scheme passes Designing the electrical length of the first metal trace and the second metal trace, the feeding position, and the coupling strength between the two or the branches thereof can control the covering of the low frequency, the intermediate frequency and the high frequency, and by adjusting the first metal trace and the first The size of the coupling spacing on the two metal traces can be further tuned to the multi-interval tunable antenna, which reduces the dependence of the product on the processing accuracy of the metal back shell and enables the product to have a low frequency band, a medium frequency band and a high frequency band. Maximum radiation efficiency, so that the product meets the performance requirements of various network standards for future mobile terminals.

In addition, the combined antenna system in the above embodiment provided by the present invention may further have the following additional technical features:

According to an embodiment of the present invention, the multi-interval tunable antenna further includes: an adjustable device disposed inside the mobile terminal and electrically connected to the second metal trace, and logic of the adjustable device The value is adjustable.

Specifically, the tunable device includes a capacitor, an inductor, an RF switch, or a matching circuit composed of a capacitor and an inductor. Accordingly, the logic value may be a capacitance value and/or an inductance value or a logic signal of the RF switch, and the logic value may be changed. To change the coupling state of the third metal trace to realize multi-interval tunable antenna tuning; further, the software of the mobile terminal can be matched with the logic value, and the logic is realized by updating the software during the use of the product. Control of the value.

According to an embodiment of the present invention, the metal shell further includes a second side shell and a second slit disposed between the second side shell and the middle shell; wherein the second side shell is provided with At least one stereo coupling antenna covering a high frequency band.

The structure utilizes the second side shell as the radiation main body to enhance the radiation performance of the product in the high frequency portion while avoiding the influence on the low frequency band and the middle frequency band.

According to an embodiment of the invention, the second side shell is provided with two stereo coupling antennas covering a high frequency band, and the two stereo coupling antennas are respectively located at two ends of the second side shell.

According to an embodiment of the present invention, the second side shell includes a bottom plate and an end plate and a side plate connected to the bottom plate; the stereo coupling antenna includes a third metal trace, the third metal trace and the The radio frequency feed internal connection of the mobile terminal is electrically connected, and the third metal trace has a first gap, a second gap and a third gap respectively between the bottom plate, the end plate and the side plate, The third metal trace is simultaneously coupled with the bottom plate, the end plate, and the side plate to transfer energy.

According to an embodiment of the present invention, the combined antenna system further includes: a grounding device located in the second slit, and grounding the second side shell, and the grounding device separating the second slit into a plurality of sub-slits; wherein the stereo coupling antenna is disposed opposite to the sub-slot.

According to an embodiment of the invention, the sub-slit opposite the stereo coupling antenna has a length of 10 mm to 30 mm.

Specifically, a middle portion of the second side shell is connected with the middle shell (main ground) by a steel sheet, and two stereo coupling antennas are disposed at both ends of the second side shell to ensure two stereo coupling antennas by using a spatial distance. In addition, the steel sheet divides the second slit into a plurality of sub-slits, and by setting the position of the steel sheet on the second slit, the length of the sub-slot opposite to the stereo-coupled antenna is controlled to be 10 mm to 30 mm. To tuned the IF portion of the combined antenna system.

It can be understood by those skilled in the art that in this solution, the dominant length of the third metal trace can be controlled by adjusting the electrical length, shape and feeding position of the third metal trace. In addition, the third metal trace in the structure is respectively connected to the bottom plate. The side plate and the end plate are coupled to feed, and the respective frequency bands of the stereo coupling antenna can be tuned by adjusting the sizes of the first gap, the second gap and the third gap, thereby reducing the radiation loss.

According to an embodiment of the present invention, a camera aperture is disposed on the bottom plate between two of the stereo coupling antennas; and/or an earphone hole is disposed on the end plate between the two stereo coupling antennas.

The isolation between the two stereocoupled antennas is increased by this structure to further attenuate current and signal interaction between the two stereocoupled antennas.

According to an embodiment of the invention, the second side shell is located on an upper side of the middle shell, and the first side shell is located on a lower side of the middle shell.

By setting the structure, the multi-interval tunable antennas of the dominant low frequency band and the dominant mid-band are located at the lower part of the mobile terminal, thereby reducing the influence of the human hand and the head on the signal when the mobile terminal performs the call function.

In addition, in the present scheme, the first slit and the second slit may be filled with a non-metal substance.

An embodiment of the second aspect of the present invention provides a mobile terminal comprising the combined antenna system described in any of the above embodiments.

The mobile terminal provided by the embodiment of the second aspect of the present invention has all the beneficial effects of the combined antenna system by providing the combined antenna system described in any of the above embodiments, and details are not described herein again.

Additional aspects and advantages of the invention will be apparent from the description of the invention.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic structural diagram of a combined antenna system according to an embodiment of the present invention;

Figure 2 is an enlarged schematic view of the portion A shown in Figure 1;

Figure 3 is an enlarged schematic view of the portion B shown in Figure 1;

4 is a schematic view showing the positional relationship between the third metal trace and the second side shell according to the present invention;

Wherein, the correspondence between the reference numerals in FIG. 1 to FIG. 4 and the component names is:

100 first side shell, 110 multi-section tunable antenna, 112 first metal trace, 111 second metal trace, 200 middle shell, 300 second side shell, 301 bottom plate, 302 end plate, 303 side plate, 310 ( 310a, 310b) a stereo coupling antenna, a 311a third metal trace, a 400 first slit, and a 500 second slit.

detailed description

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It is also possible to implement other embodiments than those described herein, and the scope of the invention is not limited by the specific embodiments disclosed below.

A combined antenna system in accordance with some embodiments of the present invention is described below with reference to FIGS. 1 through 4.

As shown in FIG. 1 and FIG. 2, the combined antenna system provided by the embodiment of the first aspect of the present invention is used for a mobile terminal, including: a metal shell disposed at a rear portion of the mobile terminal, and the metal shell includes a first side shell 100, The middle case 200 and the first slot 400 disposed between the first side case 100 and the middle case 200; and the multi-interval tunable antenna 110 cover both the low band, the middle band, and the high band.

Specifically, the multi-interval tunable antenna 110 includes: a first metal trace 112 at one end of the inner side of the first side shell 100, and the first metal trace 112 is electrically connected to the RF feed source inside the mobile terminal, and is first The side shell 100 is electrically connected; and the second metal trace 111 is located at one end of the first side shell 100 away from the first metal trace 112 and is electrically connected to the first side shell 100.

The combined antenna system provided by the embodiment of the first aspect of the present invention utilizes the first side shell 100 as a radiation main body, thereby solving the problem of coexistence of the antenna and the large area of the metal, thereby achieving matching of the product with the full metal outer casing, and further, the solution By designing the electrical length of the first metal trace 112 and the second metal trace 111, the feeding position, and the coupling strength between the two or its branches, the coverage of the low frequency, the intermediate frequency, and the high frequency can be controlled, and the first The size of the coupling distance between the metal trace 112 and the second metal trace 111 can further tuned the multi-interval tunable antenna 110, which reduces the dependence of the product on the processing accuracy of the metal back shell and enables the product to be in the low frequency band, Both the mid-band and high-band have maximum radiation efficiency, which enables the product to meet the performance requirements of various network standards for future mobile terminals.

In one embodiment of the present invention, the multi-interval tunable antenna 110 further includes: an adjustable device disposed inside the mobile terminal and electrically connected to the second metal trace 111, and the logic value of the adjustable device is adjustable.

Specifically, the tunable device includes a capacitor, an inductor, an RF switch, or a matching circuit composed of a capacitor and an inductor. Accordingly, the logic value may be a capacitance value and/or an inductance value or a logic signal of the RF switch, and the logic value may be changed. In order to change the coupling state on the second metal trace 111, the multi-interval tunable antenna 110 is tuned; further, the software of the mobile terminal can be matched with the logic value, and the software is implemented by updating the software during use of the product. Control of logical values.

Specifically, in the solution, the RF feed feeds energy into the first metal trace 112 and passes through the first The metal traces 112 transfer energy to the first side shell 100 to achieve energy radiation and transfer. Subsequently, the transferred energy passes through the first side shell 100, the adjustable device, and then reaches the second metal trace 111, the second metal. The trace 111 forms a parasitic branch of the middle and high frequency bands of the multi-interval tunable antenna 110, and generates resonances of the high frequency band and the middle frequency band; of course, the first metal trace 112 and the second metal trace in the present scheme The specific shape of 111 is not limited by the drawings 1 and 2, and the designer can control the number of branches of the first metal trace 112 and the second metal trace 111, the length of each branch, and the coupling pitch between the branches. The multi-interval tunable antenna 110 simultaneously dominates each of the low frequency, intermediate frequency, and high frequency bands.

In addition, the first metal trace 112 and the second metal trace 111 are coupled to generate resonance, and the designer can comprehensively determine the working frequency requirement of the product and the size requirement of the mobile terminal, and adjust the first metal trace 112 and the second metal. The coupling pitch on the line 111 can tune the multi-interval tunable antenna in various frequency bands of 0.68 GHz to 1 GHz and 1.5 GHz to 2.7 GHz, thereby reducing the low frequency loss of the whole machine and being effective when the user holds the mobile terminal. Reduce the loss of the left and right hands of the human body.

In one embodiment of the present invention, as shown in FIGS. 1 and 3, the metal shell further includes a second side shell 300 and a second slit 500 disposed between the second side shell 300 and the middle shell 200; The two-sided housing 300 is provided with at least one stereo coupling antenna 310 covering a high frequency band.

The structure utilizes the second side shell 300 as a radiation main body to enhance the radiation performance of the product in the high frequency portion while avoiding the influence on the low frequency band and the middle frequency band.

In an embodiment of the present invention, as shown in FIG. 1, the second side shell 300 is provided with two stereo coupling antennas 310 covering a high frequency band, which are respectively a stereo coupling antenna 310a and a stereo coupling antenna 310b. The stereo coupling antenna 310a and the stereo coupling antenna 310b are respectively located at two ends of the second side shell 300.

Further, as shown in FIG. 3 and FIG. 4, the second side shell 300 includes a bottom plate 301 and an end plate 302 and a side plate 303 connected to the bottom plate 301; for example, the stereo coupling antenna 310a includes a third metal trace 311a, specifically The third metal trace 311a is electrically connected to the RF feed source inside the mobile terminal, and the third metal trace 311a and the bottom plate 301, the end plate 302, and the side plate 303 respectively have a first gap, a second gap, and a third The gap is such that the third metal trace 311a simultaneously transfers energy to the bottom plate 301, the end plate 302, and the side plate 303 by coupling.

In addition, the combined antenna system further includes: a grounding device (not shown) located in the second slit 500, and grounding the second side shell 300, and the grounding device separating the second slit 500 into a plurality of sub-seam The gap of the sub-slot opposite to the stereo coupling antenna 310 is 10 mm to 30 mm.

Specifically, the specific shape of the third metal trace 311a in the present solution is not limited by FIG. 3 and FIG. 4. The designer can control the number of branches of the third metal trace 311a and the length of each branch. The stereo coupling antenna 310a is led to operate in a high frequency band, and is coupled to the bottom plate 301, the side plate 303, and the end plate 302 by using the third metal trace 311a, and controls the size of the first gap s1, the size of the second gap s2, and The size of the third gap s3 is used to tune the respective frequency bands of the high frequency; in the above structure, the designer can comprehensively set the working frequency band requirement of the product and the size requirement of the mobile terminal, and set the suitable first gap, second gap and third Preferably, in the present embodiment, the width s1 of the first gap is 4.5 mm to 7.5 mm, the width s2 of the second gap is 0.5 mm to 2.0 mm, and the width s3 of the third gap is 0.5 mm to 2.0. Mm, when the width of the second slit 500 is 1.3 mm to 2.0 mm, the respective frequency bands of the stereocoupled antenna 310a between 1.5 GHz and 2.7 GHz are tuned.

In a specific embodiment of the present invention, in the stereo coupling antenna 310a, the width s1 of the first gap is 5.7 mm, the width s2 of the second gap is 1.1 mm, and the width s3 of the third gap is 1.1 mm; In the antenna 310b, the width s1 of the first gap is 5.7 mm, the width s2 of the second gap is 0.8 mm, the width s3 of the third gap is 0.8 mm, and the width of the second slit 500 is set to 1.8 mm; It is a tunable capacitor (32CK417R) and / or SPDT RF switch (SKY13489).

In another embodiment of the present invention, in the stereo coupling antenna 310a, the width s1 of the first gap is 6 mm, the width s2 of the second gap is 1.1 mm, and the width s3 of the third gap is 1.1 mm; In the antenna 310b, the width s1 of the first gap is 6 mm, the width s2 of the second gap is 1.1 mm, the width s3 of the third gap is 1.1 mm, and the width of the second slit 500 is 1.9 mm; Adjustable capacitor (32CK417R) and / or SPDT RF switch (SKY13489).

In another embodiment of the present invention, in the stereo coupling antenna 310a, the width s1 of the first gap is 6.5 mm, the width s2 of the second gap is 0.8 mm, and the width s3 of the third gap is 0.8 mm; In the coupled antenna 310b, the width s1 of the first gap is 6 mm, the width s2 of the second gap is 1.1 mm, the width s3 of the third gap is 1.1 mm, and the width of the second slit 500 is set to 2 mm; Adjustable capacitor (32CK417R) and / or SPDT RF switch (SKY13489).

Combined with the features given in the above specific embodiments, the combined antenna system provided by the solution can cover the frequency band of 0.68 GHz to 0.96 GHz and the frequency band of 1.7 GHz to 2.7 GHz, and ensure that it has the maximum radiation efficiency in each frequency band, thereby The product meets the performance requirements of various network standards for future mobile terminals.

In an embodiment of the present invention, preferably, the bottom plate 301 between the two stereo coupling antennas 310 is provided with a camera hole; and/or the end plate 302 between the two stereo coupling antennas 310 is provided with an earphone hole.

The isolation between the two stereo coupling antennas 310 is improved by this structure to further weaken the current and signal interaction between the two stereo coupling antennas 310.

In one embodiment of the present invention, as shown in FIG. 1, the second side shell 300 is located on the upper side of the middle case 200, and the first side case 100 is located on the lower side of the middle case 200.

By setting the structure such that the multi-interval tunable antenna 110 of the dominant low frequency band and the dominant mid-band is located at the lower portion of the mobile terminal, the influence of the human hand and the head on the signal when the mobile terminal performs the call function is reduced.

In summary, the combined antenna system provided by the present invention utilizes the first side shell as the radiation main body, thereby solving the problem that the antenna and the metal coexist in a large area, thereby realizing the matching between the product and the full metal outer casing, and further, the scheme is designed. The electrical length of the first metal trace and the second metal trace, the feed position, and the coupling strength between the two or the branches thereof can be controlled to cover the low frequency, the intermediate frequency, and the high frequency, and the first metal trace and the second pass are adjusted The size of the coupling pitch on the metal trace can further tune the antenna to cover the high frequency, intermediate frequency and low frequency frequency bands, which reduces the dependence of the product on the processing accuracy of the metal back shell and enables the product to be in the low frequency band, the middle frequency band and the high frequency band. Both have the highest radiation efficiency, so that the product meets the performance requirements of various network standards of mobile terminals in the future.

In the present invention, the terms "first", "second", and "third" are used for the purpose of description only, and are not to be construed as indicating or implying relative importance; the term "plurality" means two or two. Above, unless otherwise explicitly defined. The terms "electrical connection", "setting" and the like should be understood broadly. For example, "electrical connection" may be directly connected to achieve current or signal interaction, or may be indirectly connected through an intermediate medium. For those skilled in the art, the specific content of the above terms in the present invention can be understood according to the specific circumstances. Righteousness.

In the description of the present invention, it is understood that the orientation or positional relationship of the terms "upper", "lower" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description. It is not intended or implied that the device or unit referred to has a particular orientation, construction and operation in a particular orientation, and therefore is not to be construed as limiting.

In the description of the present specification, the description of the terms "one embodiment", "specific embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment of the invention or In the example. In the present specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A combined antenna system for a mobile terminal, comprising:

a metal case disposed at a rear portion of the mobile terminal, and the metal case includes a first side case, a middle case, and a first gap disposed between the first side case and the middle case; and

The multi-interval tunable antenna covers the low frequency band, the middle frequency band and the high frequency band at the same time, and includes: a first metal trace electrically connected to the first side shell and the RF feed source inside the mobile terminal respectively;

The second metal trace is spaced apart from the first metal trace, and the second metal trace is electrically connected to the first side shell.
The combined antenna system of claim 1 wherein said multi-interval tunable antenna further comprises:

The adjustable device is disposed inside the mobile terminal and electrically connected to the second metal trace, and the logic value of the adjustable device is adjustable.
The combined antenna system according to claim 1 or 2, wherein the metal shell further comprises a second side shell and a second slit disposed between the second side shell and the middle shell;

Wherein, the second side shell is provided with at least one stereo coupling antenna covering the high frequency band.
The combined antenna system of claim 3 wherein:

The second side shell is provided with two stereo coupling antennas covering a high frequency band, and the two stereo coupling antennas are respectively located at two ends of the second side shell.
The combined antenna system of claim 3 wherein:

The second side shell includes a bottom plate and end plates and side plates connected to the bottom plate;

The stereo coupling antenna includes a third metal trace, the third metal trace is electrically connected to a radio frequency feed inside the mobile terminal, and the third metal trace is connected to the bottom plate, the end plate, and The side plates respectively have a first gap, a second gap and a third gap, so that the third metal trace transmits energy simultaneously with the bottom plate, the end plate and the side plate.
The combined antenna system according to claim 3, further comprising:

a grounding device, located in the second slot, grounding the second side shell, and the grounding device separating the second slot into a plurality of sub-slits;

The stereo coupling antenna is disposed opposite to the sub-slot.
The combined antenna system of claim 6 wherein:

The length of the sub-slit opposite to the stereo coupling antenna is 10 mm to 30 mm.
The combined antenna system of claim 4 wherein:

a camera aperture is disposed on the bottom plate between the two stereo coupling antennas; and/or

An earphone hole is disposed on the end plate between the two stereo coupling antennas.
The combined antenna system of claim 3 wherein:

The second side shell is located on an upper side of the middle shell, and the first side shell is located on a lower side of the middle shell.
A mobile terminal characterized by comprising the combined antenna system according to any one of claims 1 to 9.