CN101572356B - Loop antenna device - Google Patents
Loop antenna device Download PDFInfo
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- CN101572356B CN101572356B CN 200810095973 CN200810095973A CN101572356B CN 101572356 B CN101572356 B CN 101572356B CN 200810095973 CN200810095973 CN 200810095973 CN 200810095973 A CN200810095973 A CN 200810095973A CN 101572356 B CN101572356 B CN 101572356B
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- radiation
- loop
- antenna device
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Abstract
The invention relates to a loop antenna device which comprises a base plate, a grounding part, a first loop radiation part and a second loop radiation part, wherein the base plate has a surface and isprovided with a first feed-in point, a second feed-in point, a first grounding point and a second grounding point which are formed on the surface; the first loop radiation part is used for working in a specific frequency band and is provided with a first signal feed-in terminal connected with the first feed-in point and a first grounding terminal connected with the first grounding point; the seco nd loop radiation part has the shape and size which are essentially the same as those of the first loop radiation part, is used for working in the specific frequency band, and is provided with a second signal feed-in terminal connected with the second feed-in point and a second grounding terminal connected with the second grounding point; and the grounding part is arranged on the surface of the base plate, and part of the grounding part is positioned between the first loop radiation part and the second loop radiation part for separating same.
Description
Technical field
The invention relates to a kind of loop antenna device, refer to that especially a kind of employing multiple antenna design is to reach the loop antenna device of diversity (Diversity) effect.
Background technology
Just carry out like a raging firely about the research and development of WiMAX (Worldwide Interoperability for Microwave Access, global microwave access intercommunication interface) technology at present, and be about to release market.
The frequency range of WiMAX can be divided into licensed band (Licensed Band) and unlicensed band (Unlicensed Band).Wherein, licensed band is divided into again U.S. WCS (WirelessCommunication Services) frequency range (2.305GHz-2.320GHz, 2.345GHz-2.360GHz), U.S. MMDS (Multi-point Microwave Distribution System or Multi-channelMulti-point Distribution System) frequency range (2.50GHz-2.69GHz), international FWA (FixedWireless Access) frequency range (3.4GHz-3.7GHz).Unlicensed band then comprises industry science doctor (ISM) frequency range (2.4000GHz-2.4835GHz).
Therefore, the design work must be with the frequency range of Frequency Design at 2300MHz～2700MHz and 3300MHz～3800MHz at the antenna of WiMAX frequency range.
Summary of the invention
Therefore, purpose of the present invention just provides a kind of loop antenna device of the WiMAX of being applied to frequency range.
So loop antenna device of the present invention comprises a substrate, a grounding parts, one first loop Department of Radiation and a second servo loop Department of Radiation.
Substrate has a surface, is formed on one first load point on surface, is formed on one second surperficial load point, is formed on one first surperficial earth point, is formed on one second surperficial earth point.
The first loop Department of Radiation is in order to being operated in a special frequency channel, and has a first signal feed side that links to each other with the first load point, and one first earth terminal that links to each other with the first earth point.
The shape size of second servo loop Department of Radiation is identical in fact with the first loop Department of Radiation, in order to being operated in this special frequency channel, and has a secondary signal feed side that links to each other with the second load point, and one second earth terminal that links to each other with the second earth point.
Grounding parts is arranged on the surface of substrate, and the part between the first loop Department of Radiation and second servo loop Department of Radiation, in order to the interval both.
Preferably, the surface of the first loop Department of Radiation of part and substrate separately.
Description of drawings
Fig. 1 illustrates the stereogram of a substrate of the loop antenna device of the preferred embodiments of the present invention;
Fig. 2 illustrates the stereogram of the loop antenna device of the preferred embodiments of the present invention;
Fig. 3 illustrates the loop antenna device of the preferred embodiments of the present invention at the correlation field pattern figure of 2500MHz;
Fig. 4 illustrates the loop antenna device of the preferred embodiments of the present invention at the correlation field pattern figure of 3500MHz;
Fig. 5 illustrates the measurement result figure of the voltage standing wave ratio (VSWR) of the loop antenna device of the preferred embodiments of the present invention, wherein, (a) curve is the voltage standing wave ratio that the first loop Department of Radiation measures, (b) voltage standing wave ratio that then measures for the second servo loop Department of Radiation of curve;
Fig. 6 illustrates the first loop Department of Radiation of loop antenna device of the preferred embodiments of the present invention at the radiation pattern figure of 2500MHz;
Fig. 7 illustrates the second servo loop Department of Radiation of loop antenna device of the preferred embodiments of the present invention at the radiation pattern figure of 2500MHz;
Fig. 8 illustrates the first loop Department of Radiation of loop antenna device of the preferred embodiments of the present invention at the radiation pattern figure of 3500MHz;
Fig. 9 illustrates the second servo loop Department of Radiation of loop antenna device of the preferred embodiments of the present invention at the radiation pattern figure of 3500MHz; And
Figure 10 illustrates the approximate dimension schematic diagram of the loop antenna device of the preferred embodiments of the present invention.
The main element symbol description
1 substrate
11 surfaces
12 first load points
13 second load points
14 first earth points
15 second earth points
16 solder joints
17 solder joints
18 solder joints
19 solder joints
2 grounding parts
3 first loop Departments of Radiation
31 first signal feed sides
32 first earth terminals
33 first radiant sections
34 second radiant sections
35 the 3rd radiant sections
4 second servo loop Departments of Radiation
41 secondary signal feed sides
42 second earth terminals
43 the 4th radiant sections
44 the 5th radiant sections
45 the 6th radiant sections
The L straight line
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of a following cooperation preferred embodiment with reference to the accompanying drawings, can clearly present.
Consult Fig. 1 and Fig. 2, the preferred embodiment of loop antenna device of the present invention is to be applicable to PCMCIACard or other prefabricated card-inserting device, and its structure comprises a substrate 1, a grounding parts 2, one first loop Department of Radiation 3 and a second servo loop Department of Radiation 4.
The first loop Department of Radiation 3 is to be operated in a special frequency channel (2300MHz～3800MHz), and the length half-wavelength of special frequency channel in fact for this reason, it has one the 3rd radiant section 35 of a first signal feed side 31, one first earth terminal 32, one first radiant section 33, one second radiant section 34 and bending.The first radiant section 33 only with its two ends link to each other with the surface 11 of substrate 1 (be the stage casing part be with the surface 11 of substrate 1 separately), an end wherein is the first signal feed side 31 that links to each other with the first load point 12.One end of the second radiant section 34 links to each other with the other end of the first radiant section 33, and the second radiant section 34 is whole surfaces 11 that are attached at substrate 1, and imposes scolding tin with the second radiant section 34 more sticking being located on the substrate 1 at two solder joints 16,17.The 3rd radiant section 35 contiguous straight line L, and identical with the first radiant section 33 be only with its two ends link to each other with the surface 11 of substrate 1 (be the stage casing part be with the surface 11 of substrate 1 separately), the one end links to each other with the other end of the second radiant section 34, and its other end is the first earth terminal 32 that links to each other with the first earth point 14.It is worth mentioning that the first radiant section 33 and the second radiant section 34 are all generally triangular in shape, and width is all greater than the width of the 3rd radiant section 35.
Second servo loop Department of Radiation 4 also is to be operated in aforesaid special frequency channel (2300MHz～3800MHz), shape size is identical in fact with the first loop Department of Radiation 3, and is symmetrical in perpendicular to substrate 1 and the plane (not shown) by straight line L with the first loop Department of Radiation 3.Second servo loop Department of Radiation 4 has a secondary signal feed side 41 that links to each other with the second load point 13, one second earth terminal 42 that links to each other with the second earth point 15, one the 4th radiant section 43, one the 5th radiant section 44, one the 6th radiant section 45.Because the structure of second servo loop Department of Radiation 4 is identical and symmetrical with the first loop Department of Radiation 3, so its structure is no longer carefully stated.
Be the point branch interval that is grounded section 2 between the first loop Department of Radiation 3 and the second servo loop Department of Radiation 4, the advantage that so designs can improve both isolations (Isolation) and not affect the far-field radiation field pattern of antenna.And will be as the first radiant section 33 and the 4th radiant section 43 design away from each other of signal feed-in section, and will be as the 3rd radiant section 35 of ground section and the design located adjacent one another of the 6th radiant section 45, can improve the isolation of the first loop Department of Radiation 3 and second servo loop Department of Radiation 4, and make both radiation field shapes be unlikely to interfering with each other.Lower page table 1 is the first loop Department of Radiation 3 and the isolation measurement result of second servo loop Department of Radiation 4 in special frequency channel, and its isolation is all greater than 11dB, and more general standard value 10dB is good.Lower page table 2 is the first loop Department of Radiation 3 and correlation (the Envelop Correlation Coefficient) measurement result of second servo loop Department of Radiation 4 in special frequency channel, and its correlation all is lower than 0.1, and more general standard value 0.3 is good.And can be found out also at the field shape figure that 2500MHz, 3500MHz measure respectively that by Fig. 3, Fig. 4 the first loop Department of Radiation 3 is little with the correlation of second servo loop Department of Radiation 4.
Table 1
| Frequency (MHz) | 2300 | 2500 | 2700 | 3300 | 3500 | 3800 |
| Isolation (dB) | 13.8 | 12.0 | 12.0 | 12.5 | 13.0 | 11.8 |
Table 2
| Frequency (MHz) | 2300 | 2500 | 2700 | 3300 | 3500 | 3800 |
| Correlation (ρ omni) | 0.05 | 0.06 | 0.10 | 0.06 | 0.05 | 0.01 |
In addition, the design of the first radiant section 33 and the second radiant section 34 wider width helps to design the impedance matching of low frequency part, and frequency range is increased, and improves gain.Moreover the spacing of adjusting the first radiant section 33 and the 3rd radiant section 35 can be adjusted the impedance matching of HFS, to obtain higher gain and wider frequency range.And the first radiant section 33 and the second radiant section 34 are designed to triangle, and then can make flowing that the aerial radiation electric current can be mild in the turning point, so can reduce the energy leakage of antenna, and the mode that reduces between low-and high-frequency pushes, and then reach the effect of wideband.
Lower page table 3 is depicted as the first loop Department of Radiation 3 in the frequency range, second servo loop Department of Radiation 4 measured efficient (Efficiency) and maximum gain (Peak Gain).(a) curve of Fig. 5 is the voltage standing wave ratio (VSWR) that the first loop Department of Radiation 3 measures, (b) voltage standing wave ratio that then measures for second servo loop Department of Radiation 4 of curve, and by finding out among the figure, the voltage standing wave ratio in the frequency range all can be less than 2.
Table 3
| 2500 | -1.1 | 4.2 | -1.4 | 3.6 |
| 2600 | -1.2 | 4.2 | -1.4 | 3.6 |
| 2700 | -1.0 | 4.7 | -1.2 | 4.3 |
| 3300 | -1.2 | 3.6 | -1.8 | 4.4 |
| 3400 | -1.2 | 3.3 | -1.4 | 4.2 |
| 3500 | -1.1 | 3.1 | -1.2 | 4.4 |
| 3600 | -0.6 | 3.3 | -1.1 | 3.9 |
| 3700 | -1.0 | 3.2 | -1.4 | 4.1 |
| 3800 | -1.1 | 3.2 | -1.5 | 3.2 |
Fig. 6, Fig. 7 is respectively the first loop Department of Radiation 3, the radiation pattern that second servo loop Department of Radiation 4 measures at 2500MHz (Radiation Pattern) figure, Fig. 8, Fig. 9 is respectively the first loop Department of Radiation 3, the radiation pattern figure that second servo loop Department of Radiation 4 measures at 3500MHz, by finding out among the figure, the first loop Department of Radiation 3, the Waveform of second servo loop Department of Radiation 4 has effect complimentary to one another, this phenomenon quite is the effect of a kind of similar diversity (Diversity), so way can significantly reduce the bad situation of multi-path signal that effect causes, and increases the usefulness of integrated antenna.
At last, Figure 10 shows that the approximate dimension sign picture of loop antenna device.
In sum, the loop antenna device of present embodiment is operable in WiMAX frequency range (2300MHz～2700MHz and 3300MHz～3800MHz), and utilize the first loop Department of Radiation 3, second servo loop Department of Radiation 4 to receive simultaneously signal, can reduce the multi-path effect causes signal to receive bad situation, in addition, the first radiant section 33, the second radiant section 34, the 4th radiant section 43 and the 5th radiant section 44 are designed to triangle and widen its width, then capable of increasing bandwidth and increase gain is so really can reach purpose of the present invention.
Above-described, only be the preferred embodiments of the present invention, when not limiting scope of the invention process with this, the simple equivalence of namely generally doing according to content of the present invention changes and modifies, and all still belongs in the scope of the present invention.
Claims (14)
1. loop antenna device comprises:
One substrate, have a surface, be formed on this surface one first load point, be formed on this surface one second load point, be formed on this surface one first earth point, be formed on one second earth point on this surface;
One first loop Department of Radiation in order to being operated in a special frequency channel, and has a first signal feed side that links to each other with this first load point, and one first earth terminal that links to each other with this first earth point;
One second servo loop Department of Radiation, shape size is identical in fact with this first loop Department of Radiation, in order to being operated in this special frequency channel, and has a secondary signal feed side that links to each other with this second load point, and one second earth terminal that links to each other with this second earth point; And
One grounding parts is arranged on the surface of this substrate, and part is between this first loop Department of Radiation and second servo loop Department of Radiation, in order to the interval both,
Wherein, this first loop Department of Radiation of part and the surface of this substrate separately,
Wherein, this first loop Department of Radiation has also that an end links to each other with the other end of this first radiant section for one first radiant section, an end of this first signal feed side and one second radiant section, the end that are attached at the surface of this substrate links to each other with the other end of this second radiant section and the other end is one the 3rd radiant section of this first earth terminal.
2. loop antenna device according to claim 1, wherein, this first loop Department of Radiation and second servo loop Department of Radiation generally are a plane that is symmetrical in perpendicular to this substrate, and this plane is by a straight line.
3. loop antenna device according to claim 2, wherein, this first radiant section only links to each other with the surface of this substrate with its two ends.
4. loop antenna device according to claim 3, wherein, the 3rd radiant section only links to each other with the surface of this substrate with its two ends.
5. loop antenna device according to claim 4, wherein, contiguous this straight line of the 3rd radiant section.
6. arbitrary described loop antenna device wherein according to claim 1-5, wherein, this special frequency channel is 2300MHz～3800MHz.
7. loop antenna device according to claim 6, wherein, the length of this first loop Department of Radiation is essentially the half-wavelength of this special frequency channel.
8. loop antenna device according to claim 5, wherein, the width of this first radiant section is greater than the width of the 3rd radiant section.
9. loop antenna device according to claim 8, wherein, the width of this second radiant section is greater than the width of the 3rd radiant section.
10. loop antenna device according to claim 9, wherein, this first radiant section and this second radiant section are all generally triangular in shape.
11. loop antenna device according to claim 10, wherein, this special frequency channel is 2300MHz～3800MHz.
12. loop antenna device according to claim 11, wherein, the length of this first loop Department of Radiation is essentially the half-wavelength of this special frequency channel.
13. loop antenna device according to claim 12, wherein, contiguous this first earth point of this first load point.
14. loop antenna device according to claim 13, wherein, this first load point, this second load point, this first earth point, and this second earth point surrounded by this grounding parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810095973 CN101572356B (en) | 2008-04-30 | 2008-04-30 | Loop antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810095973 CN101572356B (en) | 2008-04-30 | 2008-04-30 | Loop antenna device |
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| Publication Number | Publication Date |
|---|---|
| CN101572356A CN101572356A (en) | 2009-11-04 |
| CN101572356B true CN101572356B (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810095973 Expired - Fee Related CN101572356B (en) | 2008-04-30 | 2008-04-30 | Loop antenna device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI625896B (en) * | 2016-05-13 | 2018-06-01 | Chen Yi Feng | Broadband multi-frequency dual loop antenna |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2484542B (en) * | 2010-10-15 | 2015-04-29 | Microsoft Technology Licensing Llc | LTE antenna pair for mimo/diversity operation in the LTE/GSM bands |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6539207B1 (en) * | 2000-06-27 | 2003-03-25 | Symbol Technologies, Inc. | Component for a wireless communications equipment card |
| CN1190020C (en) * | 2002-06-04 | 2005-02-16 | 智邦科技股份有限公司 | Integrated dual-frequency printed single dipole antenna |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004215152A (en) * | 2003-01-08 | 2004-07-29 | Matsushita Electric Ind Co Ltd | Heat radiator for power amplifier |
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- 2008-04-30 CN CN 200810095973 patent/CN101572356B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6539207B1 (en) * | 2000-06-27 | 2003-03-25 | Symbol Technologies, Inc. | Component for a wireless communications equipment card |
| CN1190020C (en) * | 2002-06-04 | 2005-02-16 | 智邦科技股份有限公司 | Integrated dual-frequency printed single dipole antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI625896B (en) * | 2016-05-13 | 2018-06-01 | Chen Yi Feng | Broadband multi-frequency dual loop antenna |
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|---|---|
| CN101572356A (en) | 2009-11-04 |
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Granted publication date: 20130403 Termination date: 20160430 |