CN104241824A - Combined type general reader antenna - Google Patents
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- CN104241824A CN104241824A CN201410466676.XA CN201410466676A CN104241824A CN 104241824 A CN104241824 A CN 104241824A CN 201410466676 A CN201410466676 A CN 201410466676A CN 104241824 A CN104241824 A CN 104241824A
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- 230000005855 radiation Effects 0.000 claims abstract description 60
- 230000003071 parasitic effect Effects 0.000 claims abstract description 57
- 239000004020 conductor Substances 0.000 claims abstract description 16
- 239000000523 sample Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000010287 polarization Effects 0.000 description 6
- 238000002955 isolation Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
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- 230000005540 biological transmission Effects 0.000 description 2
- DSEPKSLFXGYPIU-UHFFFAOYSA-N 8-(dipropylamino)-6,7,8,9-tetrahydro-3h-benzo[e]indole-1-carbaldehyde Chemical compound C1=C2NC=C(C=O)C2=C2CC(N(CCC)CCC)CCC2=C1 DSEPKSLFXGYPIU-UHFFFAOYSA-N 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005388 cross polarization Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The invention discloses a combined type general reader antenna which comprises a circularly polarized antenna body and a linearly polarized antenna body. The circularly polarized antenna body provides a four-feedback structure guided by an annular micro-strip feeder wire. Thick air dielectric layers are adopted between the annular micro-strip conduction wire and a first main radiation patch and between the first main radiation patch and a first parasitic patch. The linearly polarized antenna body is arranged in a square notch of the first parasitic patch in the middle of the circularly polarized antenna body. The first parasitic patch of the circularly polarized antenna body and a ring-shaped conductor strip serve as reflection plates of the linearly polarized antenna body. Space is utilized fully, and the overall size of the antenna is reduced.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly the universal combined reader antenna of one.
Background technology
Along with the development of society, radio-frequency (RF) identification (RFID) technology plays more and more important effect in people's life.REID can carry arbitrarily the object of electronic tag by the identification of electromagnetic wave medium.In the process of this technology sustainable development, the design of reader antenna act as key player.In view of decipherment distance is far away, the advantages such as the fast and high transmission rates of read or write speed, the rfid system of hyperfrequency (UHF) wave band is widely used in actual life, such as animal identification, supply chain management, and E-Payment etc.But the RFID in country variant or area permits that UHF waveband is not quite similar, such as, 840.5-844.5MHz and 920.5-924MHz of China, the 866-869MHz in Europe, the 920-926MHz of Australia, the 902-928MHz of North America, and the 952-955MHz of Japan.So if rfid system can cover the whole uhf band of 840-955MHz, the installation that so just effectively can simplify system regulates, and reduces and builds cost, and then realize global general-use.
Owing to covering the reader of general ultrahigh frequency RFID application band and microwave frequency band 2.45/5.8GHz under same scene, may have required simultaneously, such double frequency or multifrequency reader just have the realistic meaning of application, and can simplify system further, reduce and build cost.
Rfid system is generally made up of reader and label two parts, and label carry be generally linear polarized antenna.Consider that the uncertainty in orientation put by label, in order to avoid the serious polarization mismatch be coupled between reader with label, improve the reliability of information transmission, circular polarized antenna is used widely in RFID reader.Under the scene that aspect ratio comparatively determines put by some labels, the RFID reader of carrying linear polarized antenna also has corresponding application prospect.
Summary of the invention
In order to overcome the shortcoming of prior art existence with not enough, the invention provides a kind of universal combined reader antenna.
The present invention is the combined antenna organically combined by circular polarized antenna and linear polarized antenna, wherein circular polarized antenna has high-gain, excellent impedance matching and axial ratio performance, can cover the general hyperfrequency recognition circular polarization reader antenna of 840MHz-960MHz frequency band, linear polarized antenna is the Linear polarization reader antenna covering 2.45GHz microwave frequency band.
The present invention adopts following technical scheme:
A kind of universal combined reader antenna, comprises circular polarized antenna and linear polarized antenna;
Described circular polarized antenna adopts stacked structure, comprise the first parasitic patch, the first primary radiation paster, the first feeding network and the first floor from top to bottom successively, described first feeding network comprises ring shaped microstrip call wire and four metal probes, described four metal probes are along the ring shaped microstrip call wire sense of current, successively interval 1/4 λ
0evenly be placed on ring shaped microstrip call wire, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz, described first primary radiation paster is connected by four metal probes with the first parasitic patch, described first parasitic patch and the first primary radiation paster center all have square groove, also comprise finger ring shape conductor belt structure, described finger ring shape conductor belt structure is enclosed within the edge of the first parasitic patch;
Described linear polarized antenna is arranged on above the square groove of the first parasitic patch, adopt stacked structure, comprise the second parasitic patch, the second primary radiation paster and the second feeding network from top to bottom successively, described second primary radiation paster and the second parasitic patch are square structure, described second primary radiation paster is made up of two U-shaped microstrip lines of centrosymmetric unequal arm, described second feeding network is opened apertured second floor by equiarm U-shaped microstrip line call wire coupling middle part and is formed, and cuts the rectangular cutout of formed objects for two jiaos above the left and right on described second floor.
The upper left corner and the lower right corner of described second parasitic patch have isosceles right triangle corner cut, and the waist length of described isosceles right triangle is 0.049 λ
1, wherein λ
1the wavelength of free space corresponding to the centre frequency 2.45GHz of microwave frequency band.
Described second primary radiation paster is made up of two U-shaped microstrip lines of centrosymmetric unequal arm, the both sides, bottom of the U-shaped microstrip line of described unequal arm all have isosceles right triangle corner cut, the long half for the U-shaped micro belt line width of unequal arm of waist of isosceles right triangle, the entire length of described two U-shaped microstrip lines of centrosymmetric unequal arm is 0.552 λ
1, be widely about 0.083 λ
1, wherein λ
1the wavelength of free space corresponding to the centre frequency 2.45GHz of microwave frequency band.
The brachium of the U-shaped microstrip line call wire of described equiarm is 0.155 λ
1, bottom width is 0.06 λ
1, arm is wide is 0.016 λ
1, the second floor is that length and width is respectively 0.22 λ
1with 0.189 λ
1rectangle, and the center line on the second floor to have length be 0.22 λ
1, wide is 0.024 λ
1gap, floor is divided into two parts, and the rectangular cutout length on described second floor is 0.045 λ
1, wide is 0.02, wherein λ
1the wavelength of free space corresponding to microwave frequency band centre frequency 2.45GHz.
Described first primary radiation paster and the first parasitic patch are round outside but spuare inside GUTONGBI structure, described first primary radiation paster becomes cornerwise two ends of 45 degree to have arc-shaped slot with horizontal plane positive direction, the radiation angle of two arc-shaped slots is 20 degree, and symmetrical about this diagonal, the radius of described first primary radiation paster is 0.27 λ
0, the radius of the first parasitic patch is 0.23 λ
0, the height of finger ring shape conductor belt structure is 0.012 λ
0, wherein λ
0the wavelength of free space corresponding to the centre frequency 900MHz of overclocking wave band.
First primary radiation paster and the first parasitic patch core all have square groove, and the square groove length of side of the first primary radiation paster is 0.09 λ
0, the square groove length of side of the first parasitic patch is 0.072 λ
0, described arc-shaped slot length is 0.031 λ
0, wherein λ
0the wavelength of free space corresponding to the centre frequency 900MHz of shf band.
The upper edge of described linear polarized antenna and finger ring shape conductor belt structure is in same level, and the square groove distance of described second primary radiation paster distance the first parasitic patch is 4mm.
The initial segment lower edges of described ring shaped microstrip call wire has rectangle breach, and the rectangle breach length at the edge, top of ring shaped microstrip call wire is 0.045 λ
0, wide is 0.006 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
Beneficial effect of the present invention:
(1) circular polarized antenna by excite two spatially orthogonal, in phase place differ 90 ° constant amplitude degenerate mode realize.The feeding network of circular polarized antenna of the present invention is made up of micro-band call wire of a ring-type and four metal probes, the position of four probes spatially orthogonal, can excite and isolate mutually orthogonal degenerate mode, define the phase difference of 90 °, thus meet two conditions producing circularly polarised wave.
(2) circular polarized antenna adopts four feedback structures of the micro-band call wire guiding of ring-type, has the feature of symmetrical configuration, can realize the covering of broad frequency band, form symmetrical hemispherical antenna pattern.
(3) adopt thicker air dielectric layer between circular polarized antenna primary radiation paster and parasitic patch, can effectively improve bandwidth sum gain.
(4) circular polarization primary radiation paster and parasitic patch all adopt round outside but spuare inside GUTONGBI shape structure, the notch at primary radiation paster and parasitic patch center can be used for installing other electronic devices, such as put the miniature antenna that can cover higher frequency band, thus realize the modular antenna of double frequency or multifrequency.
(5) the finger ring shape conductor belt of circular polarized antenna parasitic patch came forms a ring current, is equivalent to a magnetic dipole, effectively can improve impedance matching and improve 3-dB axial ratio performance.
(6) linear polarized antenna is built in the notch at circular polarized antenna center, the parasitic patch of antenna 1 and finger ring shape conductor belt structure are as the reflecting plate of linear polarized antenna, the combining structure of two antennas can improve space availability ratio effectively, and has excellent impedance matching and high-gain equally at the antenna 2 of microwave frequency band.
(7) there is higher isolation between circular polarized antenna and linear polarized antenna.
Accompanying drawing explanation
Fig. 1 (a) ~ Fig. 1 (b) is that the structure of a kind of universal combined reader antenna of the present invention is overlooked and side-looking structural representation;
Fig. 2 is the structural representation of linear polarized antenna in Fig. 1;
Fig. 3 (a) is the structural representation of the second parasitic patch in Fig. 2, and Fig. 3 (b) is the structural representation of the second primary radiation paster in Fig. 2;
A kind of composite type reader antenna of Fig. 4 (a) reflection coefficient analogous diagram, Fig. 4 (b) is a kind of axial ratio analogous diagram of composite type reader antenna, and Fig. 4 (c) is gain analogous diagram of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Fig. 1 (a) ~ Fig. 1 (b), a kind of universal combined reader antenna, comprises circular polarized antenna and linear polarized antenna,
Described circular polarized antenna adopts stacked structure, comprise the first parasitic patch 2, first primary radiation paster 1, first feeding network and the first floor 11 from top to bottom successively, described first feeding network comprises ring shaped microstrip call wire 4 and four metal probe 9A-9D, described four metal probes are along ring shaped microstrip call wire 4 sense of current, successively interval 1/4 λ
0evenly be placed on ring shaped microstrip call wire, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz, described first primary radiation paster 1 is connected by four metal probe 9A-9D with the first parasitic patch 2, described first parasitic patch 2 and the first primary radiation paster 1 center all have square groove, also comprise finger ring shape conductor belt structure 3, described finger ring shape conductor belt structure 3 vertical sleeve is at the edge of the first parasitic patch 2;
Described linear polarized antenna is arranged on above the square groove 6 of the first parasitic patch, adopt stacked structure, specifically comprise the second parasitic patch 14, second primary radiation paster 13 and the second feeding network, described second primary radiation paster 13 and the second parasitic patch 14 are square structure, described second primary radiation paster 13 is made up of two U-shaped microstrip line 13A-13B of centrosymmetric unequal arm, described second feeding network is made up of the U-shaped microstrip line call wire 16 of equiarm the second floor 17 that middle part has a gap 18 that is coupled, the rectangular cutout 19A-19B of formed objects is cut for two jiaos above the left and right on described second floor 17.
In circular polarized antenna:
Be connected by four phase intervals, 90 ° of metal probes between ring shaped microstrip call wire 4 with the first primary radiation paster 1, then be directly connected to the radio-frequency (RF) signal input end of ring shaped microstrip call wire 4 by the first floor 11 by coaxial line 10, form whole feeding network.
Described first primary radiation paster 1 and the first parasitic patch 2 are round outside but spuare inside GUTONGBI structure, described first primary radiation paster 1 becomes 45 degree of cornerwise two ends to have arc-shaped slot 7A-7B with horizontal plane positive direction, the radiation angle of two arc-shaped slot 7A-7B is 20 degree, and symmetrical about this diagonal, the radius of described first primary radiation paster 1 is 0.27 λ
0, the radius of the first parasitic patch 2 is 0.23 λ
0, the height of finger ring shape conductor belt structure 3 is 0.012 λ
0, wherein λ
0the wavelength of free space corresponding to the centre frequency 900MHz of overclocking wave band.
First primary radiation paster 1 and the first parasitic patch 2 core all have square groove, and square groove 5 length of side of the first primary radiation paster is 0.09 λ
0, square groove 6 length of side of the first parasitic patch is 0.072 λ
0, it is 20 ° that oblique 45 ° of cornerwise edges of the first primary radiation paster have radiation angle, and length Phi is 0.031 λ
0arc-shaped slot, wherein λ
0the wavelength of free space corresponding to the centre frequency 900MHz of shf band.
The initial segment lower edges of described ring shaped microstrip call wire 4 has rectangle breach 8A-8B, and the breach length at the edge, top of ring shaped microstrip call wire is 0.045 λ in theory
0, wide is 0.006 λ in theory
0, its internal diameter is about Rs_in0.108 λ
0, external diameter Rs_out0.186 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
Distance between first floor 11 and ring shaped microstrip call wire 4 is 5mm, distance between ring shaped microstrip call wire 4 and the first primary radiation paster 1 is 20mm, distance between first primary radiation paster 1 and the first parasitic patch 2 is 10mm, and the height of finger ring shape conductor belt line structure is 4mm.
The square notch of the first primary radiation paster and the first parasitic body piece can strengthen the coupling between two radiation patch, has obvious impact to impedance matching and 3-dB axial ratio performance.
The design of circular polarized antenna multilayer lamination structure, has widened impedance matching bandwidth and axial ratio bandwidth, has improve antenna gain.-25dB return loss the bandwidth of circular polarized antenna can reach 17.4% (807-961MHz), and 3-dB axial ratio bandwidth reaches 14.4% (833-962MHz), and 2-dB axial ratio bandwidth reaches 12.9% (842-958MHz).In working band, gain can reach more than 9.1dBic, and peak gain reaches 9.8dBic.
Linear polarized antenna adopts wideband balun feed to expand the broadband of microblogging frequency range, linear polarized antenna is perpendicular to the feeding network of circular polarized antenna, and the first primary radiation paster of circular polarized antenna and the first parasitic patch have buffer action to linear polarized antenna, thus realize isolation higher between linear polarization and circular polarization.
In linear polarized antenna:
As shown in Figure 2, the medium substrate that described second primary radiation paster 13 and the second parasitic patch 14 etch is square, and size is all about 0.345 λ
1as shown in Fig. 3 (b), described second primary radiation paster is made up of two U-shaped microstrip line 13A-13B of centrosymmetric unequal arm, and described two unequal arm U-shaped microstrip line galianconism ends are connected by medium substrate with galianconism end, and the entire length of two microstrip lines is about 0.552 λ
1, wide W1 is about 0.083 λ
1the U-shaped microstrip line of every bar unequal arm has two corner cuts, the corner cut 22A-22D mono-of the capable microstrip line of described unequal arm U has four, described corner cut is the direct triangles of isosceles, be arranged in the upper and lower both sides (being found out by figure) of unequal arm U-shaped microstrip line bottom, the long Lc1 of waist is the half of the U-shaped micro-bandwidth W1 of unequal arm.
As shown in Fig. 3 (a), the upper left corner and the lower right corner of described second parasitic patch 14 all have isosceles right triangle corner cut, and the corner cut 23A-23B of the second parasitic patch has two, and waist length is for being about 0.049 λ
1, the second parasitic patch shape is square, and its length of side is about 0.278 λ
1, the interval height between the second primary radiation paster and the second parasitic patch is 2.4mm, wherein λ
1the wavelength of free space corresponding to microwave frequency band centre frequency 2.45GHz.
Wherein the brachium FL of the U-shaped micro-band call wire 16 of equiarm is about 0.155 λ
1, bottom width FW is about 0.06 λ
1, micro-bandwidth W2 is about 0.016 λ
1, the second floor 17 is respectively 0.22 λ for long Lg, wide Wg
1with 0.189 λ
1rectangle paster, and on the center line on the second floor 17, have long Lg be 0.22 λ
1, wide Ws is 0.024 λ
1gap, be divided on the second floor and be divided into two parts, rectangular cutout 19A-19B has been cut respectively in two jiaos, the left and right of the top on the second floor 17, and described rectangular cutout L1 length is 0.045 λ
1, wide hs3 is 0.02 λ
1, wherein λ
1the wavelength of free space corresponding to microwave frequency band centre frequency 2.45GHz.
The medium substrate of linear polarized antenna is thickness is 0.8mm high frequency plate RO4003 sheet material, relative dielectric constant 3.55, and loss angle tangent is 0.0027, the square of wherein parasitic patch and primary radiation paster are etched in be the length of side be 42.2mm.
Coaxial line adopts RG316-SMSM, and diameter is 2.5mm, and characteristic impedance is 50 Ω.
As shown in Fig. 4 (a)-Fig. 4 (c) ,-15dB return loss of linear polarized antenna achieves the covering of 2.395-2.668GHz, and in working frequency range, gain can reach more than 9.0dBi.19.5dB can be reached at the cross polarization ratio of 2.45GHz place antenna 2, can below-19.5dB be reached at the isolation of shf band (840-960MHz) two antenna port, can below-27dB be reached at the isolation of microwave frequency band (2.45GHz) two antenna port.
The four feedback structures that circular polarized antenna of the present invention provides a kind of annular microstrip feed line to introduce, at annular microstrip feed line and primary radiation paster, and have employed thicker air dielectric layer between primary radiation paster and parasitic patch.Linear polarized antenna is built in the square notch in the middle part of circular polarized antenna, and the parasitic patch of circular polarized antenna and finger ring shape conductor belt serve as the reflecting plate of linear polarized antenna, take full advantage of space, reduce the overall volume of antenna.
Utilize the design feature of this invention to design and cover multi-band combined reader antenna.This composite type reader antenna can cover the application band of the general ultrahigh frequency RFID of 840-960MHz, also can cover the microwave applications frequency range of 2.45GHz and 5.8GHz simultaneously, meets the different application demand under different occasion further.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (8)
1. a universal combined reader antenna, is characterized in that, comprises circular polarized antenna and linear polarized antenna;
Described circular polarized antenna adopts stacked structure, comprise the first parasitic patch, the first primary radiation paster, the first feeding network and the first floor from top to bottom successively, described first feeding network comprises ring shaped microstrip call wire and four metal probes, described four metal probes are along the ring shaped microstrip call wire sense of current, successively interval 1/4 λ
0evenly be placed on ring shaped microstrip call wire, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz, described first primary radiation paster is connected by four metal probes with the first parasitic patch, described first parasitic patch and the first primary radiation paster center all have square groove, also comprise finger ring shape conductor belt structure, described finger ring shape conductor belt structure is enclosed within the edge of the first parasitic patch;
Described linear polarized antenna is arranged on above the square groove of the first parasitic patch, adopt stacked structure, comprise the second parasitic patch, the second primary radiation paster and the second feeding network from top to bottom successively, described second primary radiation paster and the second parasitic patch are square structure, described second primary radiation paster is made up of two U-shaped microstrip lines of centrosymmetric unequal arm, described second feeding network is opened apertured second floor by equiarm U-shaped microstrip line call wire coupling middle part and is formed, and cuts the rectangular cutout of formed objects for two jiaos above the left and right on described second floor.
2. reader antenna according to claim 1, is characterized in that, the upper left corner and the lower right corner of described second parasitic patch have isosceles right triangle corner cut, and the waist length of described isosceles right triangle is 0.049 λ
1, wherein λ
1the wavelength of free space corresponding to the centre frequency 2.45GHz of microwave frequency band.
3. reader antenna according to claim 1, it is characterized in that, described second primary radiation paster is made up of two U-shaped microstrip lines of centrosymmetric unequal arm, the both sides, bottom of the U-shaped microstrip line of described unequal arm all have isosceles right triangle corner cut, the long half for the U-shaped micro belt line width of unequal arm of waist of isosceles right triangle, the entire length of described two U-shaped microstrip lines of centrosymmetric unequal arm is 0.552 λ
1, wide is 0.083 λ
1, wherein λ
1the wavelength of free space corresponding to the centre frequency 2.45GHz of microwave frequency band.
4. reader antenna according to claim 1, is characterized in that, the brachium of the U-shaped microstrip line call wire of described equiarm is 0.155 λ
1, bottom width is 0.06 λ
1, arm is wide is 0.016 λ
1, the second floor is that length and width is respectively 0.22 λ
1with 0.189 λ
1rectangle, and the center line on the second floor to have length be 0.22 λ
1, wide is 0.024 λ
1gap, floor is divided into two parts, and the rectangular cutout length on described second floor is 0.045 λ
1, wide is 0.02 λ
1, wherein λ
1the wavelength of free space corresponding to microwave frequency band centre frequency 2.45GHz.
5. reader antenna according to claim 1, it is characterized in that, described first primary radiation paster and the first parasitic patch are round outside but spuare inside GUTONGBI structure, described first primary radiation paster becomes cornerwise two ends of 45 degree to have arc-shaped slot with horizontal plane positive direction, the radiation angle of two arc-shaped slots is 20 degree, and symmetrical about this diagonal, the radius of described first primary radiation paster is 0.27 λ
0, the radius of the first parasitic patch is 0.23 λ
0, the height of finger ring shape conductor belt structure is 0.012 λ
0, wherein λ
0the wavelength of free space corresponding to the centre frequency 900MHz of overclocking wave band.
6. reader antenna according to claim 5, is characterized in that, the first primary radiation paster and the first parasitic patch core all have square groove, and the square groove length of side of the first primary radiation paster is 0.09 λ
0, the square groove length of side of the first parasitic patch is 0.072 λ
0, described arc-shaped slot length is 0.031 λ
0, wherein λ
0the wavelength of free space corresponding to the centre frequency 900MHz of shf band.
7. reader antenna according to claim 1, is characterized in that, the upper edge of described linear polarized antenna and finger ring shape conductor belt structure is in same level, and the square groove distance of described second primary radiation paster distance the first parasitic patch is 4mm.
8. reader antenna according to claim 1, is characterized in that, the initial segment lower edges of described ring shaped microstrip call wire has rectangle breach, and the rectangle breach length at the edge, top of ring shaped microstrip call wire is 0.045 λ
0, wide is 0.006 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
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|---|---|---|---|
| CN201410466676.XA CN104241824B (en) | 2014-09-12 | 2014-09-12 | A kind of universal combined reader antenna |
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|---|---|---|---|
| CN201410466676.XA CN104241824B (en) | 2014-09-12 | 2014-09-12 | A kind of universal combined reader antenna |
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| CN104241824B CN104241824B (en) | 2017-04-05 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105990666A (en) * | 2015-01-30 | 2016-10-05 | 深圳光启尖端技术有限责任公司 | Communication antenna, antenna system and communication device |
| CN107590525A (en) * | 2016-07-07 | 2018-01-16 | 华大半导体有限公司 | A kind of anti-interference RFID |
| CN108281768A (en) * | 2018-01-23 | 2018-07-13 | 深圳星联天通科技有限公司 | A kind of dual-band antenna and its terminal |
| CN108598693A (en) * | 2018-04-09 | 2018-09-28 | 重庆邮电大学 | Impedance easily matched broadband circle polarized UHF RFID readers antenna |
| CN108780949A (en) * | 2016-02-26 | 2018-11-09 | 株式会社电装 | Antenna assembly |
| CN112072302A (en) * | 2020-08-31 | 2020-12-11 | 杭州电子科技大学 | Broadband circularly polarized filter array antenna with sequential rotary feed |
| CN113113762A (en) * | 2021-03-12 | 2021-07-13 | 西安电子科技大学 | Dual-frequency dual-polarization common-aperture base station antenna and mobile communication system |
| CN115598390A (en) * | 2022-11-29 | 2023-01-13 | 深圳市道格特科技有限公司（Cn） | Multi-branch coaxial broadband radio frequency probe |
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| CN105990666A (en) * | 2015-01-30 | 2016-10-05 | 深圳光启尖端技术有限责任公司 | Communication antenna, antenna system and communication device |
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| CN108281768A (en) * | 2018-01-23 | 2018-07-13 | 深圳星联天通科技有限公司 | A kind of dual-band antenna and its terminal |
| CN108598693A (en) * | 2018-04-09 | 2018-09-28 | 重庆邮电大学 | Impedance easily matched broadband circle polarized UHF RFID readers antenna |
| CN112072302A (en) * | 2020-08-31 | 2020-12-11 | 杭州电子科技大学 | Broadband circularly polarized filter array antenna with sequential rotary feed |
| CN113113762A (en) * | 2021-03-12 | 2021-07-13 | 西安电子科技大学 | Dual-frequency dual-polarization common-aperture base station antenna and mobile communication system |
| CN115598390A (en) * | 2022-11-29 | 2023-01-13 | 深圳市道格特科技有限公司（Cn） | Multi-branch coaxial broadband radio frequency probe |
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