CN104362426A - Broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna - Google Patents
Broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna Download PDFInfo
- Publication number
- CN104362426A CN104362426A CN201410614908.1A CN201410614908A CN104362426A CN 104362426 A CN104362426 A CN 104362426A CN 201410614908 A CN201410614908 A CN 201410614908A CN 104362426 A CN104362426 A CN 104362426A
- Authority
- CN
- China
- Prior art keywords
- radiation patch
- antenna
- feeding network
- metal
- ground plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Waveguide Aerials (AREA)
Abstract
The invention relates to a broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna comprising a metal earth plate, a radiation patch, a feed coaxial cable, four metal props and a feed network. The radiation patch, the feed network and the metal earth plate are in a stacking structure. The feed coaxial cable penetrates a central hole in the metal earth plate to be electrically connected with the feed network. The radiation patch is fixed on the feed network through the metal props to serve as a director, leading to antenna gain. The feed network is composed of three L-shaped branches and four circuit opening knots. Path difference of the metal props is quarter wavelength, and phase difference is 90degrees, thus TM02 mode, TM20 mode and TM11 mode are restrained, and antenna axis ratio bandwidth is increased. The antenna impedance bandwidth is of 13%, and the antenna axis ratio bandwidth is of 5%. Within working frequency, maximum antenna gain is 9.4dB, covering range is wide, and circular polarization is high. The common working frequency band of the antenna UHF RFID system is applicable to RFID read-write systems of 850MHz-950MHz frequency band.
Description
Technical field
The present invention relates to a kind of wide band UHF RFID reader antenna.
Background technology
REID (Radio Frequency Identification, abbreviation RFID), is utilize wireless radio frequency transmission mode, sets up the new technique of contactless two-way communication between reader and label.In today that Internet of Things is day by day prevailing, radio-frequency (RF) identification (RFID) technology plays its more and more huger effect.But there is oneself UHF RFID frequency range in each country, such as, the frequency range of China is 840.5-844.4MHz and 920.5-924.5MHz; Europe is 866-869MHz, and South America and North America are 902-928MHz; Singapore is 866-869MHz and 920-925MHz; Japan is 952-955MHz etc., and namely the frequency band of UHF RFID covers the scope of 840.5-955MHz.Therefore, a RFID reader antenna that can cover whole frequency range (840MHz-960MHz) will be conducive to the develop rapidly of global Internet of Things cause.
The property at random of putting due to label can affect the polarization feed relation between reader antenna and label antenna, and under many labels scene, the coupled interference between label antenna also can change the operating frequency of antenna.Thus circular polarization and wide band reader antenna become a large demand of RFID technique.Now there is employing coplanar wave guide feedback both at home and abroad, fractal structure, L shape probe feed, feeding network, fluting meander technology, various micro-band circular polarized antenna such as peculiarly shaped radiation patch.Its general principle is all based on the orthogonal linear polarization electric field component of generation two, and makes the two amplitude equal, the thought that phase is 90 degree.The method realized mainly contains single feedback method and many feedbacks method, and single feedback method is simple but frequency band is narrow; Many feedbacks method needs additional power division network, bandwidth but not easily miniaturized.
Summary of the invention
The object of the invention is to the defect existed for prior art, a kind of wide band UHF RFID reader antenna is provided, this operating frequency of antenna is 850MHz-950MHz, covers the conventional working frequency range of country variant in ultrahigh-frequency radio-frequency identification system, can be used for the read-write system of UHF RFID.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of wide band UHF RFID reader antenna, total three-decker, comprises the radiation patch of the metal ground plate of ground floor, the feeding network of the second layer and third layer; In the center perforate of described metal ground plate, by feeding coaxial lines, metal ground plate is connected with feeding network; Described feeding network is made up of three GeLXing branches and four open circuit minor matters; Described radiation patch is circular; Described feeding network and radiation patch utilize four metal mainstays to be connected, and four metal mainstays lay respectively in four open circuit minor matters, and orientation angles differs 90 degree successively.
Described metal ground plate uses stainless steel to be material, the material selection aluminium of feeding network and radiation patch, and feeding network and radiation patch are fixing by four same metallic screw perforation.
Described metal ground plate is different with the spacing of feeding network and radiation patch from the spacing of feeding network, and the dielectric constant of two different spacing and material affects the resonance frequency of antenna.
The radius of described radiation patch
obtained by following formulae discovery:
Wherein,
the light velocity,
the resonance frequency of Antenna Operation,
it is the relative dielectric constant of medium.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and remarkable advantage:
Inventive antenna works in shf band, and impedance bandwidth is 13%, and Circular polarization ratio bandwidth is 5%, and gain is 9.4dB, and front-to-back ratio is better.Inventive antenna feeding network is separated with radiation patch, and the mode be connected up and down by metal mainstay reduces antenna size; Adopt air as dielectric layer, solve the high Q resonance characteristic of micro-strip paster antenna, the broadening impedance bandwidth of antenna; Adopt the sonde-type feeding classification of 4 metal mainstays, the major part of feeding network and radiation patch are isolated, reduces false radiation, improve the radiation efficiency of antenna; Left-handed or right-handed circular polarization ripple can be realized easily by the length controlling open circuit minor matters.The conventional working frequency range of this antenna cover country variant in ultrahigh-frequency radio-frequency identification system, therefore can be applicable to the UHF RFID read-write system of 850MHz-950MHz frequency range.
Accompanying drawing explanation
Fig. 1 is wide band UHF RFID reader antenna vertical view.
Fig. 2 is wide band UHF RFID reader antenna end view.
Fig. 3 is the structure chart of feeding network.
Fig. 4 is the structure chart of radiation patch.
Fig. 5 is antenna emulation S parameter.
Fig. 6 is antenna axial ratio curve chart.
Fig. 7 is antenna gain patterns.
Embodiment
Details are as follows by reference to the accompanying drawings for the preferred embodiments of the present invention:
embodiment 1
See Fig. 1 ~ Fig. 4, a kind of wide band UHF RFID reader antenna, total three-decker, comprises the radiation patch 3 of the metal ground plate 1 of ground floor, the feeding network 2 of the second layer and third layer; In the center perforate of described metal ground plate 1, by feeding coaxial lines 4, metal ground plate 1 is connected with feeding network 2; Described feeding network 2 is made up of three GeLXing branches 5 and four open circuit minor matters 6; Described radiation patch 3 is circular; Described feeding network 2 and radiation patch 3 utilize four metal mainstays 7 to be connected, and four metal mainstays 7 lay respectively in four open circuit minor matters 6, and orientation angles differs 90 degree successively.
embodiment 2
The present embodiment is substantially the same manner as Example 1, and special feature is: described metal ground plate 1 uses stainless steel for material, the material selection aluminium of feeding network 2 and radiation patch 3, and feeding network 2 and radiation patch 3 are fixing by four same metallic screw perforation.
The spacing of described metal ground plate 1 and feeding network 2 is different with the spacing of radiation patch 3 with feeding network 2, and the dielectric constant of two different spacing and material affects the resonance frequency of antenna.
Described radiation patch 3 is radiuses
through type (1) calculates:
（1）
Wherein,
the light velocity,
the resonance frequency of Antenna Operation,
it is the relative dielectric constant of medium.Feeding network 2 adopts three GeLXing branches, and making has the wavelength path of 1/4th poor between adjacent two metal mainstays 7, namely shown in formula (2):
（2）
Thus in radiation patch 3, produce the phase place of 0 degree, 90 degree, 180 degree, 270 degree successively.Because pair of metal pillar 7 phase difference be positioned on same axis is 180 degree, respective encouraged TM
01mould or TM
10mould is in-phase stacking, and TM
02mould and TM
20mould is cancelled out each other, and can not encourage TM
11mould, thus substantially increases the axial ratio characteristic of antenna.Adopt the mode of corner cut to form the end of four open circuit minor matters 6, introduce perturbation, be conducive to regulating the feed placement of radiation patch 3 and the axial ratio bandwidth of antenna.This reader antenna have employed the probe feed mode of four metal mainstays 7, the major part of feeding network 2 and radiation patch 3 is isolated, reduces false radiation, improves antenna radiation efficiency, compared to microstrip-fed other modes such as grade, will form wider bandwidth.Fig. 5 is antenna emulation S parameter, as can be seen from Figure S
11≤-10dB impedance bandwidth reaches 13%.Fig. 6 is antenna axial ratio curve chart, and the axial ratio bandwidth of AR≤3dB is 5% as can be seen from Figure, and at operating frequency 920MHz place, the axial ratio of antenna is approximately 0.7dB.Fig. 7 is antenna gain pattern direction, and when reader operating frequency 920MHz, the gain of antenna is up to 9.4dB, and antenna sidelobe is lower, has good radiation characteristic.
Claims (4)
1. a wide band UHF RFID reader antenna, is characterized in that: total three-decker, comprises the radiation patch (3) of the metal ground plate (1) of ground floor, the feeding network (2) of the second layer and third layer; In the center perforate of described metal ground plate (1), by feeding coaxial lines (4), metal ground plate (1) is connected with feeding network (2); Described feeding network (2) is made up of three GeLXing branches (5) and four open circuits minor matters (6); Described radiation patch (3) is circular; Described feeding network (2) and radiation patch (3) utilize four metal mainstays (7) to be connected, and four metal mainstays (7) lay respectively on four open circuits minor matters (6), and orientation angles differs 90 degree successively.
2. wide band UHF RFID reader antenna according to claim 1, it is characterized in that: described metal ground plate (1) uses stainless steel to be material, the material selection aluminium of feeding network (2) and radiation patch (3), feeding network (2) and radiation patch (3) are fixing by four same metallic screw perforation.
3. wide band UHF RFID reader antenna according to claim 1, it is characterized in that: the spacing of described metal ground plate (1) and feeding network (2) is different with the spacing of radiation patch (3) with feeding network (2), the dielectric constant of two different spacing and material affects the resonance frequency of antenna.
4. wide band UHF RFID reader antenna according to claim 1, is characterized in that: the radius of described radiation patch (3)
obtained by following formulae discovery:
Wherein,
the light velocity,
the resonance frequency of Antenna Operation,
it is the relative dielectric constant of medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410614908.1A CN104362426A (en) | 2014-11-05 | 2014-11-05 | Broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410614908.1A CN104362426A (en) | 2014-11-05 | 2014-11-05 | Broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104362426A true CN104362426A (en) | 2015-02-18 |
Family
ID=52529665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410614908.1A Pending CN104362426A (en) | 2014-11-05 | 2014-11-05 | Broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104362426A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071027A (en) * | 2015-08-17 | 2015-11-18 | 上海航天测控通信研究所 | Low-profile UHF antenna |
| CN106229611A (en) * | 2016-08-09 | 2016-12-14 | 中山大学 | A kind of high efficiency rectification antenna based on the input of microwave RFID frequency range small-power |
| CN107196053A (en) * | 2017-04-13 | 2017-09-22 | 成都电科星天科技有限公司 | The low elevation angle omnidirectional radiation dual circularly polarized antenna of small size |
| CN107196052A (en) * | 2017-04-13 | 2017-09-22 | 成都电科星天科技有限公司 | The low elevation angle omnidirectional radiation circular polarized antenna of small size |
| CN107480756A (en) * | 2017-08-11 | 2017-12-15 | 成都德杉科技有限公司 | A kind of antenna design method of flexible anti-metal tag |
| CN108493593A (en) * | 2018-05-21 | 2018-09-04 | 南京信息工程大学 | A kind of polarization reconfigurable antenna array based on feeding network |
| CN109755730A (en) * | 2019-01-08 | 2019-05-14 | 成都频岢微电子有限公司 | A kind of high performance mini entelechy antenna based on Meta Materials |
| CN111682305A (en) * | 2020-05-25 | 2020-09-18 | 电子科技大学 | Low-profile circularly polarized microstrip antenna for satellite communication |
| WO2023274192A1 (en) * | 2021-06-30 | 2023-01-05 | 华为技术有限公司 | Microstrip antenna and electronic device |
-
2014
- 2014-11-05 CN CN201410614908.1A patent/CN104362426A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 刘诚: "海事卫星通信系统终端天线的研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071027A (en) * | 2015-08-17 | 2015-11-18 | 上海航天测控通信研究所 | Low-profile UHF antenna |
| CN105071027B (en) * | 2015-08-17 | 2018-11-20 | 上海航天测控通信研究所 | A kind of low profile UHF antenna |
| CN106229611A (en) * | 2016-08-09 | 2016-12-14 | 中山大学 | A kind of high efficiency rectification antenna based on the input of microwave RFID frequency range small-power |
| CN107196053A (en) * | 2017-04-13 | 2017-09-22 | 成都电科星天科技有限公司 | The low elevation angle omnidirectional radiation dual circularly polarized antenna of small size |
| CN107196052A (en) * | 2017-04-13 | 2017-09-22 | 成都电科星天科技有限公司 | The low elevation angle omnidirectional radiation circular polarized antenna of small size |
| CN107480756A (en) * | 2017-08-11 | 2017-12-15 | 成都德杉科技有限公司 | A kind of antenna design method of flexible anti-metal tag |
| CN107480756B (en) * | 2017-08-11 | 2020-05-26 | 成都德杉科技有限公司 | Antenna design method of flexible anti-metal tag |
| CN108493593A (en) * | 2018-05-21 | 2018-09-04 | 南京信息工程大学 | A kind of polarization reconfigurable antenna array based on feeding network |
| CN108493593B (en) * | 2018-05-21 | 2023-10-13 | 南京信息工程大学 | Polarization reconfigurable antenna array based on feed network |
| CN109755730A (en) * | 2019-01-08 | 2019-05-14 | 成都频岢微电子有限公司 | A kind of high performance mini entelechy antenna based on Meta Materials |
| CN111682305A (en) * | 2020-05-25 | 2020-09-18 | 电子科技大学 | Low-profile circularly polarized microstrip antenna for satellite communication |
| WO2023274192A1 (en) * | 2021-06-30 | 2023-01-05 | 华为技术有限公司 | Microstrip antenna and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104362426A (en) | Broadband UHF (ultra-high frequency) RFID (radio frequency identification) reader antenna | |
| CN201146246Y (en) | Radio frequency recognition circular polarization reader array antenna based on annular feed network | |
| CN104037496B (en) | A kind of omnidirectional circular-polarized antenna | |
| CN202712422U (en) | Ultra wide-band antenna | |
| CN206349489U (en) | A kind of double-decker broadband UHF RFID anti-metal tag antennas | |
| CN101807748A (en) | Broadband circularly polarization microstrip patch antenna | |
| CN104241824B (en) | A kind of universal combined reader antenna | |
| CN103515700B (en) | A kind of RFID antenna | |
| CN111786078B (en) | Broadband radio frequency identification reader-writer antenna with circularly polarized beam width | |
| CN203983490U (en) | A kind of new ideas Broadband circularly polarized antenna | |
| CN205723942U (en) | A kind of circularly polarization microstrip patch antenna with TV university resonance characteristic | |
| CN208078157U (en) | A kind of RFID near field reading and writing device antenna array | |
| EP3245690B1 (en) | Dual-band inverted-f antenna with multiple wave traps for wireless electronic devices | |
| CN103337706A (en) | Miniaturized, low-profile and three-ring-shaped RFID tag antenna capable of working under ultra high frequency (UHF) band | |
| CN110718742A (en) | Miniaturized high-gain RFID reader-writer antenna | |
| CN208570901U (en) | A kind of compact wideband circular polarisation back cavity type RFID reader antenna | |
| CN204651491U (en) | There is the difference gap mimo antenna of high cmrr | |
| CN207677081U (en) | Broadband circularly polarized antenna based on annular patch | |
| Jie et al. | A proximity-coupled circularly polarized slotted-circular patch antenna for RF energy harvesting applications | |
| CN109037938A (en) | A kind of millimeter wave broadband circular polarization microstrip antenna | |
| CN204558640U (en) | A kind of ultrahigh frequency broadband circular polarization RFID reader antenna | |
| KR20130101719A (en) | Design technique of a circularly polarized antenna for uhf band rfid reader | |
| CN203503789U (en) | Subsize circular polarization ultrahigh frequency RFID reader fractal antenna | |
| CN204205046U (en) | A kind of universal combined reader antenna | |
| CN109149088A (en) | A kind of circular polarized antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150218 |