CN104241824B - A kind of universal combined reader antenna - Google Patents
A kind of universal combined reader antenna Download PDFInfo
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- CN104241824B CN104241824B CN201410466676.XA CN201410466676A CN104241824B CN 104241824 B CN104241824 B CN 104241824B CN 201410466676 A CN201410466676 A CN 201410466676A CN 104241824 B CN104241824 B CN 104241824B
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- 230000003071 parasitic effect Effects 0.000 claims abstract description 55
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- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000000523 sample 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
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000009467 reduction 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention discloses a kind of universal combined reader antenna, including circular polarized antenna and linear polarized antenna, circular polarized antenna provides the four feedback structures that a kind of annular microstrip feed line is introduced, in annular micro-strip call wire and the first primary radiation paster, and first employ thicker air dielectric layer between primary radiation paster and the first parasitic patch, linear polarized antenna is built in the square notch of the first parasitic patch in the middle part of circular polarized antenna, first parasitic patch and finger ring-shaped conductor band of circular polarized antenna serve as the reflecting plate of linear polarized antenna, take full advantage of space, reduce the overall volume of antenna.
Description
Technical field
The present invention relates to field of radio frequency identification, more particularly to a kind of universal combined reader antenna.
Background technology
With the development of society, RF identification (RFID) technology plays more and more important effect in people's life.
REID can pass through the object that the identification of electromagnetic wave medium arbitrarily carries electronic tag.In the technology sustainable development
During, the design of reader antenna act as key player.In view of identification distance is remote, read or write speed is fast and high transmission rates etc. are excellent
Point, the RFID system of hyperfrequency (UHF) wave band are widely used in actual life, such as animal identification, supply chain management, with
And pay by mails etc..However, the RFID licenses UHF waveband in country variant or area is not quite similar, and such as, the 840.5- of China
844.5MHz and 920.5-924MHz, the 866-869MHz in Europe, the 920-926MHz, the 902- of North America of Australia
928MHz, and the 952-955MHz of Japan.Then, if RFID system can cover the whole uhf bands of 840-955MHz, that
Just can the installation of effectively simplified system adjust, cost is built in reduction, and then realizes global general-use.
Due to covering the reader of general ultrahigh frequency RFID application band and microwave frequency band 2.45/5.8GHz in same field
Under scape, may have required simultaneously, such double frequency or multifrequency reader just have the realistic meaning applied, and can further letter
Change system, reduction build cost.
RFID system is typically made up of reader and label two parts, and the generally linear polarized antenna that label is carried.
The uncertainty in orientation is put in view of label, in order to avoid the serious polarization mismatch coupled between reader and label, is improved
The reliability of information transfer, circular polarized antenna are used widely in RFID reader.Some labels put aspect ratio compared with
It is determined that scene under, carry linear polarized antenna RFID reader also have corresponding application prospect.
The content of the invention
In order to overcome the shortcoming that prior art is present with a kind of not enough, universal combined reader antenna of present invention offer.
The present invention is the combined antenna organically combined by circular polarized antenna and linear polarized antenna, wherein circular polarized antenna
It is, than performance, the general hyperfrequency entelechy of 840MHz-960MHz frequency bands can be covered with high-gain, excellent impedance matching and axle
Change reader antenna, linear polarized antenna is the Linear polarization reader antenna for covering 2.45GHz microwave frequency bands.
The present invention is adopted the following technical scheme that：
A kind of universal combined reader antenna, including circular polarized antenna and linear polarized antenna；
The circular polarized antenna adopts stacked structure, includes that the first parasitic patch, the first primary radiation are pasted from top to bottom successively
Piece, the first feeding network and the first floor, first feeding network include annular micro-strip call wire and four metal probes, institute
Four metal probes are stated along the annular micro-strip call wire sense of current, 1/4 λ is spaced successively0Annular micro-strip conduction is placed on uniformly
On line, wherein λ0Centered on free space corresponding to frequency 900MHz wavelength, the first primary radiation paster is parasitic with first
Paster is provided with square groove with the first primary radiation paster center by four metal probe connections, first parasitic patch,
Also include referring to ring-shaped conductor band structure, the finger ring-shaped conductor band structure is enclosed within the edge of the first parasitic patch；
The linear polarized antenna is arranged on above the square groove of the first parasitic patch, using stacked structure, from top to bottom according to
It is secondary including the second parasitic patch, the second primary radiation paster and the second feeding network, the second primary radiation paster and second parasitic
Paster is square structure, and the second primary radiation paster is made up of the U-shaped microstrip line of two centrosymmetric unequal arms, and described
Two feeding networks are opened apertured second floor by the U-shaped microstrip line call wire coupling middle part of equiarm and are constituted, second floor
Two jiaos of rectangular cutouts for cutting with formed objects above left and right.
The upper left corner and the lower right corner of second parasitic patch has isosceles right triangle corner cut, and the isosceles are straight
A length of 0.049 λ of waist of angle triangle1, wherein λ1The wavelength of free space corresponding to the mid frequency 2.45GHz of microwave frequency band.
The second primary radiation paster is made up of the U-shaped microstrip line of two centrosymmetric unequal arms, and the unequal arm is U-shaped micro-
The bottom both sides of band wire are provided with isosceles right triangle corner cut, the U-shaped microstrip line of a length of unequal arm of waist of isosceles right triangle
The half of width, the entire length of the U-shaped microstrip line of two centrosymmetric unequal arms is 0.552 λ1, wide about 0.083 λ1,
Wherein λ1The wavelength of free space corresponding to the mid frequency 2.45GHz of microwave frequency band.
The brachium of the U-shaped microstrip line call wire of the equiarm is 0.155 λ1, bottom width is 0.06 λ1, a width of 0.016 λ of arm1, second
Floor is that length and width is respectively 0.22 λ1With 0.189 λ1Rectangle, and on the centrage on the second floor, be provided with a length of 0.22 λ1, it is wide
For 0.024 λ1Gap, floor is divided into into two parts, a length of 0.045 λ of rectangular cutout on second floor1, it is a width of
0.02, wherein λ1The wavelength of free space corresponding to microwave frequency band mid frequency 2.45GHz.
The first primary radiation paster and the first parasitic patch are round outside but spuare inside GUTONGBI structure, the first main spoke
Penetrate paster and have arc-shaped slot, the radiation angle of two arc-shaped slots into 45 degree of cornerwise two ends with horizontal plane positive direction
20 degree are, and it is symmetrical with regard to the diagonal, and the radius of the first primary radiation paster is 0.27 λ0, the half of the first parasitic patch
Footpath is 0.23 λ0, refer to that the height of ring-shaped conductor band structure is 0.012 λ0, wherein λ0For the mid frequency 900MHz institutes of overclocking wave band
The wavelength of correspondence free space.
First primary radiation paster and the first parasitic patch core are provided with square groove, the first primary radiation paster it is square
A length of 0.09 λ of trough rim0, the square groove length of side of the first parasitic patch is 0.072 λ0, the arc-shaped slot length is 0.031 λ0, its
Middle λ0The wavelength of free space corresponding to the mid frequency 900MHz of shf band.
In same level, second primary radiation is pasted for the upper edge of the linear polarized antenna and finger ring-shaped conductor band structure
The square groove distance of the first parasitic patch of piece distance is 4mm.
The initial segment lower edges of the annular micro-strip call wire are provided with rectangular v notch v, the top of annular micro-strip call wire
A length of 0.045 λ of rectangular v notch v at edge0, a width of 0.006 λ0, wherein λ0Centered on free space corresponding to frequency 900MHz
Wavelength.
Beneficial effects of the present invention：
(1) circular polarized antenna can be orthogonal in two spaces by exciting, and the constant amplitude degenerate mode that 90 ° are differed in phase place is realized.
The feeding network of circular polarized antenna of the present invention is made up of the micro-strip call wire and four metal probes of a ring-type, four probes
Position spatially orthogonal, can excite and isolate mutually orthogonal degenerate mode, define 90 ° of phase contrast, so as to meet
Produce two conditions of circularly polarised wave.
(2) four feedback structures of the circular polarized antenna using the guiding of ring-type micro-strip call wire, the characteristics of with symmetrical configuration, can
The covering of broad frequency band is realized, symmetrical hemispherical antenna pattern is formed.
(3) thicker air dielectric layer is adopted between circular polarized antenna primary radiation paster and parasitic patch, can be effectively
Improve bandwidth and gain.
(4) circular polarisation primary radiation paster and parasitic patch adopt round outside but spuare inside GUTONGBI shape structure, primary radiation paster
Can be used to other electronic devices be installed with the notch at parasitic patch center, such as put the miniature antenna that can cover higher frequency band,
So as to realize the modular antenna of double frequency or multifrequency.
(5) the finger ring-shaped conductor band of circular polarized antenna parasitic patch came forms a ring current, equivalent to one
Individual magnetic dipole, can effectively improve impedance matching and improve 3-dB axles and compare performance.
(6) linear polarized antenna is built in the notch at circular polarized antenna center, the parasitic patch and finger ring-shaped conductor of antenna 1
Reflecting plate of the band structure as linear polarized antenna, the combinative structure of two antennas can effectively improve space availability ratio, and micro-
The antenna 2 of wave frequency section equally has excellent impedance matching and high-gain.
(7) there is higher isolation between circular polarized antenna and linear polarized antenna.
Description of the drawings
Fig. 1 (a)～Fig. 1 (b) is that a kind of structure of universal combined reader antenna of the present invention is overlooked and side-looking structure is shown
It is intended to；
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 knot of the second primary radiation paster in Fig. 2
Structure schematic diagram；
A kind of combination type reader antenna reflection coefficient analogous diagrams of Fig. 4 (a), Fig. 4 (b) is a kind of combination type reader antenna
Axle than analogous diagram, Fig. 4 (c) be the present invention gain analogous diagram.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in Fig. 1 (a)～Fig. 1 (b), a kind of universal combined reader antenna, including circular polarized antenna and linear polarization
Antenna,
The circular polarized antenna adopts stacked structure, includes that the first parasitic patch 2, the first primary radiation are pasted from top to bottom successively
Piece 1, the first feeding network and the first floor 11, first feeding network include that annular micro-strip call wire 4 and four metals are visited
Pin 9A-9D, four metal probes are spaced 1/4 λ successively along annular 4 sense of current of micro-strip call wire0Ring is placed on uniformly
On shaped microstrip call wire, wherein λ0Centered on free space corresponding to frequency 900MHz wavelength, the first primary radiation paster 1
It is connected by four metal probe 9A-9D with the first parasitic patch 2, in first parasitic patch 2 and the first primary radiation paster 1
Square groove is provided with the heart, also including ring-shaped conductor band structure 3 is referred to, the finger ring-shaped conductor band structure 3 is vertically enclosed within first and posts
The edge of raw paster 2；
The linear polarized antenna is arranged on above the square groove 6 of the first parasitic patch, using stacked structure, specifically includes the
Two parasitic patch 14, the second primary radiation paster 13 and the second feeding network, the second primary radiation paster 13 and the second parasitic patch
Piece 14 is square structure, and the second primary radiation paster 13 is made up of the U-shaped microstrip line of two centrosymmetric unequal arms, described
Second feeding network is coupled middle part and is provided with second floor 17 in gap 18 and constituted by the U-shaped microstrip line call wire of equiarm 16, and described the
Two jiaos of rectangular cutouts 19A-19B for cutting with formed objects above the left and right on two floors 17.
In circular polarized antenna：
It is connected by four phase intervals, 90 ° of metal probes between annular micro-strip call wire 4 and the first primary radiation paster 1
Connect, then be directly connected to the radio-frequency (RF) signal input end of annular micro-strip call wire 4 by coaxial line 10 by the first floor 11, constitute whole
Feeding network.
The first primary radiation paster 1 and the first parasitic patch 2 are round outside but spuare inside GUTONGBI structure, first master
Radiation patch 1 has arc-shaped slot 7A-7B, two arc-shaped slots into 45 degree of cornerwise two ends with horizontal plane positive direction
The radiation angle of 7A-7B is 20 degree, and symmetrical with regard to the diagonal, and the radius of the first primary radiation paster 1 is 0.27 λ0, the
The radius of one parasitic patch 2 is 0.23 λ0, refer to that the height of ring-shaped conductor band structure 3 is 0.012 λ0, wherein λ0For overclocking wave band
The wavelength of free space corresponding to mid frequency 900MHz.
First primary radiation paster 1 and 2 core of the first parasitic patch are provided with square groove, the side of the first primary radiation paster
5 length of side of shape groove is 0.09 λ0, 6 length of side of square groove of the first parasitic patch is 0.072 λ0, oblique 45 ° of the first primary radiation paster are diagonally
The edge of line is provided with radiation angle for 20 °, and length Phi is 0.031 λ0Arc-shaped slot, wherein λ0For the center of shf band
The wavelength of free space corresponding to frequency 900MHz.
The initial segment lower edges of the annular micro-strip call wire 4 are provided with rectangular v notch v 8A-8B, annular micro-strip call wire
Initial end edge breach length be theoretically 0.045 λ0, it is wide to be theoretically 0.006 λ0, its internal diameter about Rs_in0.108 λ0, outward
0.186 λ of footpath Rs_out0, wherein λ0Centered on free space corresponding to frequency 900MHz wavelength.
The distance between first floor 11 and annular micro-strip call wire 4 are 5mm, annular micro-strip call wire 4 and the first main spoke
The distance between paster 1 is penetrated for 20mm, the distance between the first primary radiation paster 1 and the first parasitic patch 2 are 10mm, finger ring shape
The height of conductor strip 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, right
Impedance matching and 3-dB axles have significantly impact than performance.
The design of circular polarized antenna multilayer lamination structure, has widened impedance matching bandwidth and axial ratio bandwidth, has improve day
Line gain.- 25dB return losses the bandwidth of circular polarized antenna can reach 17.4% (807-961MHz), and 3-dB axial ratio bandwidths reach
To 14.4% (833-962MHz), 2-dB axial ratio bandwidths reach 12.9% (842-958MHz).In working band, gain can
More than 9.1dBic is reached, peak gain reaches 9.8dBic.
Linear polarized antenna has expanded the broadband of microwave frequency band using wideband balun feed, and linear polarized antenna is perpendicular to circular polarisation
The feeding network of antenna, and the first primary radiation paster and the first parasitic patch of circular polarized antenna has isolation to make to linear polarized antenna
With so as to realize isolation higher between linear polarization and circular polarisation.
In linear polarized antenna：
As shown in Fig. 2 the second primary radiation paster 13 be with the medium substrate that the second parasitic patch 14 is etched it is square,
Size is each about 0.345 λ1, such as shown in Fig. 3 (b), the second primary radiation paster is U-shaped micro- by two centrosymmetric unequal arms
Band wire is constituted, and the U-shaped microstrip line galianconism end of two unequal arms is connected by medium substrate with galianconism end, two microstrip lines it is whole
Body length is about 0.552 λ1, wide W1 about 0.083 λ1, the U-shaped microstrip line of every unequal arm is provided with two corner cuts, the unequal arm U
Corner cut 22A-22D mono- of row microstrip line has four, and the corner cut is the direct triangle of isosceles, positioned at the U-shaped microstrip line of unequal arm
The upper and lower both sides (by finding out in figure) of bottom, half of the long Lc1 of waist for the U-shaped micro-strip width W1 of unequal arm.
As shown in Fig. 3 (a), the upper left corner and the lower right corner of second parasitic patch 14 are provided with isosceles right triangle and cut
Angle, corner cut 23A-23B of the second parasitic patch have two, a length of about 0.049 λ of waist1, the second parasitic patch be shaped as it is square,
Its length of side is about 0.278 λ1, the interval height between the second primary radiation paster and the second parasitic patch is 2.4mm, wherein λ1For
The wavelength of free space corresponding to microwave frequency band mid frequency 2.45GHz.
Wherein the brachium FL of the U-shaped micro-strip call wire of equiarm 16 is about 0.155 λ1, bottom width FW about 0.06 λ1, micro-strip width W2
About 0.016 λ1, the second floor 17 is that long Lg, wide Wg are respectively 0.22 λ1With 0.189 λ1Rectangle paster, and on the second floor
Long Lg is provided with 17 centrage for 0.22 λ1, wide Ws is 0.024 λ1Gap, the second floor is divided into and is divided into two parts,
Two jiaos of the left and right of the top on two floors 17 cuts with rectangular cutout 19A-19B, rectangular cutout L1 a length of 0.045 respectively
λ1, wide hs3 is 0.02 λ1, wherein λ1The wavelength of free space corresponding to microwave frequency band mid frequency 2.45GHz.
The medium substrate of linear polarized antenna is that thickness is 0.8mm high frequency plate RO4003 sheet materials, and relative dielectric constant 3.55 is damaged
Consumption angle tangent is 0.0027, and wherein parasitic patch and primary radiation paster are etched in the square for being the length of side for 42.2mm.
Coaxial line adopts RG316-SMSM, a diameter of 2.5mm, and characteristic impedance is 50 Ω.
As shown in Fig. 4 (a)-Fig. 4 (c), -15dB return losses of linear polarized antenna realize covering for 2.395-2.668GHz
Lid, in working frequency range, gain can reach more than 9.0dBi.The cross polarization ratio of antenna 2 can reach at the 2.45GHz
19.5dB, can reach below -19.5dB in the isolation of two antenna port of shf band (840-960MHz), in Microwave Frequency
The isolation of section (2.45GHz) two antenna port can reach below -27dB.
Circular polarized antenna of the present invention provides the four feedback structures that a kind of annular microstrip feed line is introduced, in annular microstrip feed line and master
Thicker air dielectric layer is employed between radiation patch, and primary radiation paster and parasitic patch.Linear polarized antenna is built in
In square notch in the middle part of circular polarized antenna, the parasitic patch and finger ring-shaped conductor band of circular polarized antenna serve as linear polarized antenna
Reflecting plate, takes full advantage of space, reduces the overall volume of antenna.
The multi-band combined reader antenna of covering can also be designed using the construction featuress of the invention.This combination type is read
Read device antenna can cover 840-960MHz general ultrahigh frequency RFID application band, also can cover simultaneously 2.45GHz and
The microwave applications frequency range of 5.8GHz, further meets the different application demand under different occasions.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention not by the embodiment
Limit, other any spirit without departing from the present invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (7)
1. a kind of universal combined reader antenna, it is characterised in that including circular polarized antenna and linear polarized antenna；
The circular polarized antenna adopts stacked structure, include successively from top to bottom the first parasitic patch, the first primary radiation paster, the
One feeding network and the first floor, first feeding network include annular micro-strip call wire and four metal probes, described four
Root metal probe is spaced 1/4 λ successively along the annular micro-strip call wire sense of current0Uniformly it is placed on annular micro-strip call wire,
Wherein λ0Centered on free space corresponding to frequency 900MHz wavelength, the first primary radiation paster and annular micro-strip call wire
Connected by four metal probes, first parasitic patch is provided with square groove with the first primary radiation paster center, also wraps
Finger ring-shaped conductor band structure is included, the finger ring-shaped conductor band structure is enclosed within the edge of the first parasitic patch；
The linear polarized antenna is arranged on above the square groove of the first parasitic patch, using stacked structure, is wrapped successively from top to bottom
Include the second parasitic patch, the second primary radiation paster and the second feeding network, the second primary radiation paster and the second parasitic patch
It is square structure, the second primary radiation paster is made up of the U-shaped microstrip line of two centrosymmetric unequal arms, second feedback
Electric network is opened apertured second floor by the U-shaped microstrip line call wire coupling middle part of equiarm and is constituted, the left and right on second floor
Two jiaos of top cuts with the rectangular cutout of formed objects；
The bottom both sides of the U-shaped microstrip line of the unequal arm are provided with isosceles right triangle corner cut, the waist of isosceles right triangle
The half of the U-shaped micro belt line width of a length of unequal arm, the entire length of the U-shaped microstrip line of two centrosymmetric unequal arms is
0.552λ1, a width of 0.083 λ1, wherein λ1The wavelength of free space corresponding to the mid frequency 2.45GHz of microwave frequency band.
2. reader antenna according to claim 1, it is characterised in that the upper left corner and bottom right of second parasitic patch
Angle has isosceles right triangle corner cut, a length of 0.049 λ of waist of the isosceles right triangle1, wherein λ1For Microwave Frequency
The wavelength of free space corresponding to the mid frequency 2.45GHz of section.
3. reader antenna according to claim 1, it is characterised in that the brachium of the U-shaped microstrip line call wire of the equiarm
For 0.155 λ1, bottom width is 0.06 λ1, a width of 0.016 λ of arm1, the second floor is that length and width is respectively 0.22 λ1With 0.189 λ1It is rectangular
A length of 0.22 λ is provided with shape, and the centrage on the second floor1, a width of 0.024 λ1Gap, floor is divided into into two parts, institute
State a length of 0.045 λ of rectangular cutout on the second floor1, a width of 0.02 λ1, wherein λ1For microwave frequency band mid frequency 2.45GHz institutes
The wavelength of correspondence free space.
4. reader antenna according to claim 1, it is characterised in that the first primary radiation paster and the first parasitic patch
Piece is round outside but spuare inside GUTONGBI structure, the first primary radiation paster and horizontal plane positive direction into 45 degree cornerwise two
End has arc-shaped slot, and the radiation angle of two arc-shaped slots is 20 degree, and symmetrical with regard to the diagonal, first master
The radius of radiation patch is 0.27 λ0, the radius of the first parasitic patch is 0.23 λ0, refer to that the height of ring-shaped conductor band structure is
0.012λ0, wherein λ0The wavelength of free space corresponding to the mid frequency 900MHz of overclocking wave band.
5. reader antenna according to claim 4, it is characterised in that in the first primary radiation paster and the first parasitic patch
Center portion point is provided with square groove, and the square groove length of side of the first primary radiation paster is 0.09 λ0, the square trough rim of the first parasitic patch
A length of 0.072 λ0, the arc-shaped slot length is 0.031 λ0, wherein λ0Corresponding to the mid frequency 900MHz of shf band
The wavelength of free space.
6. reader antenna according to claim 1, it is characterised in that the linear polarized antenna with refer to ring-shaped conductor band knot
In same level, the square groove distance of the first parasitic patch of the second primary radiation paster distance is 4mm for the upper edge of structure.
7. reader antenna according to claim 1, it is characterised in that the initial segment of the annular micro-strip call wire is upper and lower
Edge is provided with rectangular v notch v, a length of 0.045 λ of rectangular v notch v of the initial end edge of annular micro-strip call wire0, a width of 0.006
λ0, wherein λ0Centered on free space corresponding to frequency 900MHz wavelength.
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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 true CN104241824B (en) | 2017-04-05 |
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Families Citing this family (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 |
| JP6421769B2 (en) * | 2016-02-26 | 2018-11-14 | 株式会社Ｓｏｋｅｎ | Antenna device |
| CN107590525A (en) * | 2016-07-07 | 2018-01-16 | 华大半导体有限公司 | A kind of anti-interference RFID |
| CN108281768B (en) * | 2018-01-23 | 2019-12-03 | 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 |
| CN112072302B (en) * | 2020-08-31 | 2021-04-13 | 杭州电子科技大学 | Broadband circularly polarized filter array antenna with sequential rotary feed |
| CN113113762B (en) * | 2021-03-12 | 2022-05-03 | 西安电子科技大学 | Dual-frequency dual-polarization common-aperture base station antenna and mobile communication system |
| CN115598390B (en) * | 2022-11-29 | 2023-05-23 | 深圳市道格特科技有限公司 | Multi-branch coaxial broadband radio frequency probe |
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2014
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| CN104241824A (en) | 2014-12-24 |
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