CN104577343A - Compact dual-circular-polarization RFID (radio frequency identification) microstrip antenna - Google Patents
Compact dual-circular-polarization RFID (radio frequency identification) microstrip antenna Download PDFInfo
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- CN104577343A CN104577343A CN201310493688.7A CN201310493688A CN104577343A CN 104577343 A CN104577343 A CN 104577343A CN 201310493688 A CN201310493688 A CN 201310493688A CN 104577343 A CN104577343 A CN 104577343A
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Abstract
The invention discloses a compact dual-circular-polarization RFID (radio frequency identification) microstrip antenna. An upper foam medium layer, an air medium layer and a lower foam medium layer are arranged on the compact dual-circular-polarization RFID microstrip antenna from top to bottom sequentially; a patch is arranged between the upper foam medium layer and the air medium layer; a bottom plate is arranged between the air medium layer and the lower foam medium layer; a microstrip line is arranged on the lower surface of the lower foam medium layer; a crossed gap formed by orthogonal intersection of two straight-line gaps same in length is formed in the center of the patch; a square through hole concentric with the crossed gap is formed in the center of the patch; the side length of the square through hole is 1/5 to 1/3 of that of one straight-line gap of the crossed gap. According to the compact dual-circular-polarization RFID microstrip antenna, through formation of the square through hole in the center of the patch, the current of the patch can be constrained, a relatively high port isolation degree can be obtained, the port isolation higher than 20 dB can be achieved, and requirements of narrowband communication of an RFID system can be completely met.
Description
Technical field
The present invention relates to a kind of RFID microstrip antenna, particularly relate to a kind of compact double-circle polarization RFID microstrip antenna.
Background technology
Usually, in order to realize low section and feeder line and radiation patch be separated, many use slot-coupled microstrip antennas, such antenna enables designer according to microwave integrated circuit application requirement, selects the medium being different from radiating layer.For the dual circularly polarized antenna of rfid system microwave frequency band, generally determine the microwave network of coupler or other complexity based on 3dB branch line style, come two separate, mutually isolated couple feed cutler feeds.But this structure exists a structural bottleneck: separate couple feed gap and feeding network limit the miniaturization of antenna and radio-frequency card, use microwave network, require larger wiring area, limit the layout of back-end circuit.As everyone knows, the RFID antenna of microwave frequency band, though can telecommunication be realized, but exist and the invalid defect of standing wave occurs sometimes, therefore, be necessary the antenna of microwave frequency band and coil to integrate, this coil can be used for providing power to low frequency system by inductance coupling high, needs the wiring area reducing feeder line as far as possible like this.In order to save the wiring area of feeder network, breaking bottleneck, needing to design the slot-coupled microstrip antenna not using complicated feeder network to have cramped construction, realizing double-circle polarization.In RFID application, in general data communication amount is not very large, even sometimes, only has several byte, therefore rfid system does not generally require broadband, and circular polarization modulation system can carry out arrowband communication, realize the data communication simplified, so just need to design the dual circularly polarized antenna that two feed port that can be used for circular polarization modulation have good isolation.Positive pole of the present invention proposes based on this kind of designing requirement.
Summary of the invention
Object of the present invention is just to provide a kind of compact double-circle polarization RFID microstrip antenna to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
Compact double-circle polarization RFID microstrip antenna of the present invention, from top to bottom be provided with foam medium layer, air dielectric layer, lower foam medium layer successively, paster is provided with between described upper foam medium layer and described air dielectric layer, base plate is provided with between described air dielectric layer and described lower foam medium layer, the lower surface of described lower foam medium layer is provided with microstrip line, and the center of described paster is provided with by two isometric orthogonal " ten " font gaps formed, " one " font gap; The center of described paster is provided with and the concentric square through-hole in described " ten " font gap, and the length of side of described square through-hole is 1/1 to three/5th of wherein " one " font gap length in described " ten " font gap.
As preferably, the length of side of described square through-hole is 1/4th of wherein " one " font gap length in described " ten " font gap.
Further, described paster is square corner cut paster, and its structure is: removed by wherein a pair cutting on the cross of square patch.
As preferably, the described diagonal angle of excision is isosceles triangle, and its isosceles length of side is 1/1 to four/8th of the described square patch length of side, is more preferably 1/5th.
Beneficial effect of the present invention is:
The present invention by arranging square through-hole at paster center, thus can retrain paster electric current, to obtain better interport isolation, can realize the port isolation higher than 20dB; After changing traditional square patch into square corner cut paster, can improve circular polarization performance and the port performance of antenna further, its compact conformation, volume are little, meet the requirement of rfid system arrowband communication completely.
Accompanying drawing explanation
Fig. 1 is the transparent effect plan structure schematic diagram of compact double-circle polarization RFID microstrip antenna of the present invention;
Fig. 2 is the relative position relation structural representation of compact double-circle polarization RFID microstrip antenna of the present invention at its thickness direction.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As depicted in figs. 1 and 2, compact double-circle polarization RFID microstrip antenna of the present invention, from top to bottom be provided with foam medium layer 8 successively, air dielectric layer 9, lower foam medium layer 10, paster 4 is provided with between upper foam medium layer 8 and air dielectric layer 9, base plate 3 is provided with between air dielectric layer 9 and lower foam medium layer 10, the lower surface of lower foam medium layer 10 is provided with microstrip line 6, the center of paster 4 is provided with by two isometric orthogonal " ten " font gaps 5 formed, " one " font gap, the center of paster 4 is also provided with and the concentric square through-hole 7 in " ten " font gap 5, the length of side of square through-hole 7 is 1/4th of wherein " one " font gap length in " ten " font gap 5, also can be other ratio between 1/to three/5th, paster 4 is square corner cut paster, its structure is: excised at wherein a pair diagonal angle 2 of square patch, the diagonal angle 2 of excision is isosceles triangle, and its isosceles length of side is 1/5th of the square patch length of side, also can be other ratio between 1/to four/8th.Also show two port ones of microstrip line 6, in 90 degree of angles between the axis of two port ones in Fig. 1.
By the emulation testing to this compact double-circle polarization RFID microstrip antenna, this microstrip antenna meets the requirement of RFID application, and high port isolation and circular polarization performance enable system use circular polarization to modulate.This antenna has small size, low section characteristic, use this coupling and feeding classification to achieve port isolation higher than 20dB and good circular polarization performance simultaneously, and do not use 3dB branch line style directional coupler or other complicated feed network, so just save wiring space for IC designs, antenna miniaturization is only limited to the size of paster 4.This compact double-circle polarization RFID microstrip antenna is mainly used in general rfid system, also can be applicable to some identification cards and some other wireless telecommunication system.
Claims (5)
1. a compact double-circle polarization RFID microstrip antenna, from top to bottom be provided with foam medium layer, air dielectric layer, lower foam medium layer successively, paster is provided with between described upper foam medium layer and described air dielectric layer, base plate is provided with between described air dielectric layer and described lower foam medium layer, the lower surface of described lower foam medium layer is provided with microstrip line, and the center of described paster is provided with by two isometric orthogonal " ten " font gaps formed, " one " font gap; It is characterized in that: the center of described paster is provided with and the concentric square through-hole in described " ten " font gap, the length of side of described square through-hole is 1/1 to three/5th of wherein " one " font gap length in described " ten " font gap.
2. compact double-circle polarization RFID microstrip antenna according to claim 1, is characterized in that: the length of side of described square through-hole is 1/4th of wherein " one " font gap length in described " ten " font gap.
3. compact double-circle polarization RFID microstrip antenna according to claim 1 and 2, is characterized in that: described paster is square corner cut paster, and its structure is: removed by wherein a pair cutting on the cross of square patch.
4. according to the compact double-circle polarization RFID microstrip antenna that right 3 is stated, it is characterized in that: the described diagonal angle of excision is isosceles triangle, its isosceles length of side is 1/1 to four/8th of the described square patch length of side.
5. according to the compact double-circle polarization RFID microstrip antenna that right 4 is stated, it is characterized in that: the described isosceles length of side is 1/5th of the described square patch length of side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310493688.7A CN104577343A (en) | 2013-10-21 | 2013-10-21 | Compact dual-circular-polarization RFID (radio frequency identification) microstrip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310493688.7A CN104577343A (en) | 2013-10-21 | 2013-10-21 | Compact dual-circular-polarization RFID (radio frequency identification) microstrip antenna |
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| Publication Number | Publication Date |
|---|---|
| CN104577343A true CN104577343A (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310493688.7A Pending CN104577343A (en) | 2013-10-21 | 2013-10-21 | Compact dual-circular-polarization RFID (radio frequency identification) microstrip antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107978865A (en) * | 2017-12-06 | 2018-05-01 | 北京华镁钛科技有限公司 | A kind of wide scan angle S-band double-circle polarization microstrip antenna and its array for phased array |
| CN113437530A (en) * | 2021-07-06 | 2021-09-24 | 上海航天测控通信研究所 | Broadband miniaturized stripline dual-circular polarization network |
| US11387568B2 (en) | 2018-05-09 | 2022-07-12 | Huawei Technologies Co., Ltd. | Millimeter-wave antenna array element, array antenna, and communications product |
-
2013
- 2013-10-21 CN CN201310493688.7A patent/CN104577343A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107978865A (en) * | 2017-12-06 | 2018-05-01 | 北京华镁钛科技有限公司 | A kind of wide scan angle S-band double-circle polarization microstrip antenna and its array for phased array |
| CN107978865B (en) * | 2017-12-06 | 2023-10-24 | 北京华镁钛科技有限公司 | Wide scanning angle S-band double circularly polarized microstrip antenna for phased array and array thereof |
| US11387568B2 (en) | 2018-05-09 | 2022-07-12 | Huawei Technologies Co., Ltd. | Millimeter-wave antenna array element, array antenna, and communications product |
| CN113437530A (en) * | 2021-07-06 | 2021-09-24 | 上海航天测控通信研究所 | Broadband miniaturized stripline dual-circular polarization network |
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Legal Events
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20150429 |