CN104241825A - Universal ultrahigh-frequency circularly polarized antenna for reader - Google Patents
Universal ultrahigh-frequency circularly polarized antenna for reader Download PDFInfo
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- CN104241825A CN104241825A CN201410466846.4A CN201410466846A CN104241825A CN 104241825 A CN104241825 A CN 104241825A CN 201410466846 A CN201410466846 A CN 201410466846A CN 104241825 A CN104241825 A CN 104241825A
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- radiation paster
- primary radiation
- hyperfrequency
- circular polarization
- call wire
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Abstract
The invention discloses a universal ultrahigh-frequency circularly polarized antenna for a reader. The structure of the antenna is divided into four layers including a floor, an annular microstrip transmission line, a primary radiation patch, a parasitic radiation patch and a finger-ring-shaped conductor band which is arranged on the edge of the parasitic radiation patch, and the four layers are all made of metal copper. The primary radiation patch and the parasitic radiation patch are both in an ancient-copper-coin-shape structure which is round outside and square inside. Two arc notches are formed in the edges of the diagonal line, which inclines at 45 degrees, of the primary radiation patch. The finger-ring-shaped miniature conductor band is embedded into the edge of the parasitic radiation patch. The annular microstrip transmission line and the primary radiation patch are connected with each other through four metal probes with the phase interval of 90 degrees. A coaxial line is directly connected to the radio frequency signal input end of the annular microstrip transmission line from the floor, so that a whole feed network is formed. In a working frequency band, the universal ultrahigh-frequency circularly polarized antenna for the reader has excellent impedance matching, good circular polarization performance, high gain and a hemispheric radiation pattern, and the universal ultrahigh-frequency circularly polarized antenna for the reader is suitable for the radio frequency identification field.
Description
Technical field
The present invention relates to field of radio frequency identification, particularly one general hyperfrequency recognition circular polarization reader antenna.
Background technology
Radio-frequency (RF) identification (RFID, Radio Frequency Identification Devices) 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.
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.
Summary of the invention
In order to overcome the shortcoming of prior art existence with not enough, the invention provides and there is high-gain, excellent impedance matching and axial ratio performance, and the one that can cover 840-960MHz frequency band general hyperfrequency recognition circular polarization reader antenna.
The present invention adopts following technical scheme:
A kind of general hyperfrequency recognition circular polarization reader antenna, adopt stacked structure, comprise parasitic radiation paster, primary radiation paster, feeding network and floor from top to bottom successively, described 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 primary radiation paster is connected by four metal probes with parasitic radiation paster, and described parasitic radiation paster and primary radiation paster are round outside but spuare inside GUTONGBI structure.
Described primary radiation paster becomes 45 degree of cornerwise two ends 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 primary radiation paster is 0.27 λ
0, parasitic radiation paster radius is 0.23 λ
0, the length of side of the square notch at primary radiation paster center and the square notch at parasitic radiation paster center is respectively 0.09 λ
0with 0.072 λ
0.
Also comprise finger ring shape conductor belt line, the edge being embedded in parasitic radiation paster is vertically close to by described finger ring shape conductor belt line.
The height of described finger ring shape conductor belt line is 0.012 λ
0.
The initial segment lower edges of described ring shaped microstrip call wire has rectangle breach, and described rectangle breach length is 0.045 λ
0, wide is 0.006 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
Distance between described floor and ring shaped microstrip call wire is 5mm, and the distance between ring shaped microstrip call wire and primary radiation paster is 20mm, and the distance between primary radiation paster and parasitic patch is 10mm.
The internal diameter of described ring shaped microstrip call wire is 0.108 λ
0, external diameter is 0.186 λ
0, ring shaped microstrip call wire width is 26mm.
Beneficial effect of the present invention:
(1) circular polarized antenna is by exciting two orthogonal spaces, and the constant amplitude degenerate mode of phase 90 ° realizes, and feeding network of the present invention is made up of micro-band call wire of a ring-type and four metal probes.Current path on micro-band call wire, the interval between four metal probes are adjacent is about 1/4th λ
0, the position of four probes spatially orthogonal, can excite and isolate mutually orthogonal degenerate mode, and metal probe adjacent between interval be about 1/4th λ
0, make the phase difference defining 90 ° between degenerate mode, thus meet two conditions producing circularly polarised wave;
(2) the four feedback structures adopting the micro-band call wire of ring-type to guide, have the feature of symmetrical configuration, can realize the covering of broad frequency band, and form symmetrical hemispherical antenna pattern;
(3) adopt thicker air dielectric layer between primary radiation paster and parasitic patch, can effectively improve bandwidth sum gain;
(4) 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 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.
Accompanying drawing explanation
Fig. 1 (a)-Fig. 1 (b) is vertical view and the end view of the structure of a kind of general hyperfrequency recognition circular polarization reader antenna of the present invention;
Fig. 2 is the reflection coefficient analogous diagram of a kind of general hyperfrequency recognition circular polarization reader antenna of the present invention;
Fig. 3 is the axial ratio analogous diagram of a kind of general hyperfrequency recognition circular polarization reader antenna of the present invention;
Fig. 4 is the gain analogous diagram of a kind of general hyperfrequency recognition circular polarization reader antenna 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 general hyperfrequency recognition circular polarization reader antenna, adopt multilayer lamination structure, be followed successively by parasitic radiation paster 2 from top to bottom, primary radiation paster 1, feeding network and floor 11, described floor 11 is the bottom, also comprise finger ring shape conductor belt line 3, the edge being embedded in parasitic radiation paster 2 is vertically close to by described finger ring shape conductor belt line 3, described parasitic radiation paster 2 is connected by four metal probe 9A-9D with primary radiation paster 1, described feeding network comprises annular microstrip line call wire 4 and four metal probes, described four metal probe 9A-9D are along annular microstrip line call wire 4 sense of current, interval 1/4 λ successively
0evenly be placed on ring shaped microstrip call wire, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
Ring shaped microstrip call wire is connected by four phase intervals, 90 ° of metal probes with between primary radiation paster, then is directly connected to the radio-frequency (RF) signal input end of ring shaped microstrip call wire by floor by coaxial line, forms whole feeding network.
Described primary radiation paster 1 and parasitic radiation paster 2 are round outside but spuare inside GUTONGBI structure, and the radius R a of primary radiation paster 1 is 0.27 λ
0, parasitic radiation paster 2 radius R b is 0.23 λ
0, length of side Lm, the Lp of the square notch 5 at primary radiation paster center and the square notch 6 at parasitic radiation paster center are respectively 0.09 λ
0with 0.072 λ
0, the height h4 of described finger ring shape conductor belt line 3 is 0.012 λ
0.
Alice is with by described finger ring shape conductor belt line 3.
Described primary radiation paster 1 becomes cornerwise two ends of miter angle to have arc-shaped slot with horizontal plane positive direction, the radiation angle of described two arc-shaped slots 7A, 7B is 20 degree, and symmetrical about this diagonal.
The internal diameter Rs_in of described ring shaped microstrip call wire 4 is about 0.108 λ
0, external diameter Rs_out is about 0.186 λ
0, namely micro-band call wire width is 26mm, and the lower edges of the initiating terminal of described annular microstrip line has two rectangle breach 8A, 8B, and it is 0.045 λ that breach is about
0, be widely about 0.006 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
Floor is square, and length of side Lgd is about 0.750.75 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
Distance h1 between floor 11 and ring shaped microstrip call wire 4 is 5mm, distance h2 between ring shaped microstrip call wire 4 and primary radiation paster 1 is 20mm, distance h3 between primary radiation paster 1 and parasitic patch 2 is 10mm, and the height h4 of finger ring shape conductor belt line structure is 4mm.
Antenna adopts complete copper structure, and thickness is 1mm.
Coaxial line 10 adopts RG316-SMSM, and diameter is 2.5mm, and characteristic impedance is 50 Ω.
The notch at primary radiation paster of the present invention and parasitic patch center can strengthen intercoupling between two radiation patch, has obvious impact to impedance matching and 3-dB axial ratio performance.
The design of multilayer lamination structure, has widened impedance matching bandwidth and axial ratio bandwidth, has improve antenna gain.-25dB return loss bandwidth 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.
Simulation result as Fig. 2-Fig. 4 shows, this antenna has superior impedance matching, good circular polarization performance, higher gain, as can be seen from Fig., S11<-25dB can cover 807-961MHz frequency range, 3-dB axial ratio bandwidth can cover 833-962MHz frequency range, and 2-dB axial ratio bandwidth can cover 842-958MHz frequency range, in 840-960MHz frequency range, gain can reach 9.1dBic, and peak value can reach 9.8dBic.
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 general hyperfrequency recognition circular polarization reader antenna, adopt stacked structure, it is characterized in that, comprise parasitic radiation paster, primary radiation paster, feeding network and floor from top to bottom successively, described 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 primary radiation paster is connected by four metal probes with parasitic radiation paster, and described parasitic radiation paster and primary radiation paster are round outside but spuare inside GUTONGBI structure.
2. one according to claim 1 general hyperfrequency recognition circular polarization reader antenna, it is characterized in that, described primary radiation paster becomes 45 degree of cornerwise two ends 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.
3. one according to claim 1 general hyperfrequency recognition circular polarization reader antenna, is characterized in that, the radius of described primary radiation paster is 0.27 λ
0, parasitic radiation paster radius is 0.23 λ
0, the length of side of the square notch at primary radiation paster center and the square notch at parasitic radiation paster center is respectively 0.09 λ
0with 0.072 λ
0.
4. the general hyperfrequency recognition circular polarization reader of the one according to any one of claim 1-3 antenna, is characterized in that, also comprises finger ring shape conductor belt line, and the edge being embedded in parasitic radiation paster is vertically close to by described finger ring shape conductor belt line.
5. one according to claim 4 general hyperfrequency recognition circular polarization reader antenna, is characterized in that, the height of described finger ring shape conductor belt line is 0.012 λ
0.
6. one according to claim 1 general hyperfrequency recognition circular polarization reader antenna, is characterized in that, the initial segment lower edges of described ring shaped microstrip call wire has rectangle breach, and described rectangle breach length is 0.045 λ
0, wide is 0.006 λ
0, wherein λ
0centered by the wavelength of free space corresponding to frequency 900MHz.
7. one according to claim 1 general hyperfrequency recognition circular polarization reader antenna, it is characterized in that, distance between described floor and ring shaped microstrip call wire is 5mm, distance between ring shaped microstrip call wire and primary radiation paster is 20mm, and the distance between primary radiation paster and parasitic patch is 10mm.
8. according to one according to claim 7 general hyperfrequency recognition circular polarization reader antenna, it is characterized in that, the internal diameter of described ring shaped microstrip call wire is 0.108 λ
0, external diameter is 0.186 λ
0, ring shaped microstrip call wire width is 26mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410466846.4A CN104241825A (en) | 2014-09-12 | 2014-09-12 | Universal ultrahigh-frequency circularly polarized antenna for reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410466846.4A CN104241825A (en) | 2014-09-12 | 2014-09-12 | Universal ultrahigh-frequency circularly polarized antenna for reader |
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| Publication Number | Publication Date |
|---|---|
| CN104241825A true CN104241825A (en) | 2014-12-24 |
Family
ID=52229473
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|---|---|---|---|
| CN201410466846.4A Pending CN104241825A (en) | 2014-09-12 | 2014-09-12 | Universal ultrahigh-frequency circularly polarized antenna for reader |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868241A (en) * | 2015-05-19 | 2015-08-26 | 上海大学 | Miniature ultrahigh frequency anti-metal multipurpose RFID label antenna |
| CN105206911A (en) * | 2015-08-24 | 2015-12-30 | 桂林电子科技大学 | Zeroth-order resonator and low-profile zeroth-order resonator omnidirectional circularly polarized antenna |
| CN111684656A (en) * | 2018-02-14 | 2020-09-18 | 图尔克控制有限公司 | Antenna for communication with a transponder |
| CN112310609A (en) * | 2020-11-25 | 2021-02-02 | 福州大学 | Low-profile wide-beam circularly polarized reader antenna applied to RFID |
| CN116914435A (en) * | 2023-09-12 | 2023-10-20 | 上海英内物联网科技股份有限公司 | Broadband circularly polarized patch antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102509879A (en) * | 2011-12-14 | 2012-06-20 | 上海交通大学 | Circular polarized antenna with omnidirectional broad axial ratio beam width |
| CN204067575U (en) * | 2014-09-12 | 2014-12-31 | 华南理工大学 | A kind of general hyperfrequency recognition circular polarization reader antenna |
-
2014
- 2014-09-12 CN CN201410466846.4A patent/CN104241825A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102509879A (en) * | 2011-12-14 | 2012-06-20 | 上海交通大学 | Circular polarized antenna with omnidirectional broad axial ratio beam width |
| CN204067575U (en) * | 2014-09-12 | 2014-12-31 | 华南理工大学 | A kind of general hyperfrequency recognition circular polarization reader antenna |
Non-Patent Citations (1)
| Title |
|---|
| YI LIU等: "Circularly Polarized Antenna with Circular Shaped Patch and Strip for Worldwide UHF RFID Applications", 《ANTENNAS & PROPAGATION(ISAP),2013 PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868241A (en) * | 2015-05-19 | 2015-08-26 | 上海大学 | Miniature ultrahigh frequency anti-metal multipurpose RFID label antenna |
| CN104868241B (en) * | 2015-05-19 | 2018-03-06 | 上海大学 | Minimize hyperfrequency anti-metal multipurpose RFID label antenna |
| CN105206911A (en) * | 2015-08-24 | 2015-12-30 | 桂林电子科技大学 | Zeroth-order resonator and low-profile zeroth-order resonator omnidirectional circularly polarized antenna |
| CN111684656A (en) * | 2018-02-14 | 2020-09-18 | 图尔克控制有限公司 | Antenna for communication with a transponder |
| CN112310609A (en) * | 2020-11-25 | 2021-02-02 | 福州大学 | Low-profile wide-beam circularly polarized reader antenna applied to RFID |
| CN116914435A (en) * | 2023-09-12 | 2023-10-20 | 上海英内物联网科技股份有限公司 | Broadband circularly polarized patch antenna |
| CN116914435B (en) * | 2023-09-12 | 2023-11-24 | 上海英内物联网科技股份有限公司 | Broadband circularly polarized patch antenna |
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Application publication date: 20141224 |