CN203774454U - Circularly polarized antenna - Google Patents
Circularly polarized antenna Download PDFInfo
- Publication number
- CN203774454U CN203774454U CN201320813263.5U CN201320813263U CN203774454U CN 203774454 U CN203774454 U CN 203774454U CN 201320813263 U CN201320813263 U CN 201320813263U CN 203774454 U CN203774454 U CN 203774454U
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- China
- Prior art keywords
- antenna
- dielectric
- circularly polarized
- slab
- reflecting plate
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- 230000005855 radiation Effects 0.000 claims abstract description 13
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Abstract
The utility model relates to a circularly polarized antenna. The circularly polarized antenna comprises a dielectric plate, an antenna reflecting plate and an antenna circuit board located on the antenna reflecting plate; the antenna circuit board comprises a quadrature hybrid network and a feed point; the dielectric plate comprises an antenna radiation sheet which is connected with the quadrature hybrid network through metal supports; four corners of the dielectric plate and four corners of the antenna reflecting plate which are corresponding to each other are respectively provided with a through hole; supporting columns used for isolating the dielectric plate and the antenna reflecting plate are arranged between the dielectric plate and the antenna reflecting plate; and the dielectric plate and the antenna reflecting plate are respectively fixed to two ends of each supporting column through screws at the through holes. With the circularly polarized antenna adopted, the axis ratio of the circularly polarized antenna can be effectively improved, and the read-write distance of an RFID system can be improved, and the identification efficiency of tags can be improved. The dual-end feed microstrip circularly polarized antenna is advantageous in lower axial ratio and better circularly polarized properties.
Description
Technical field
The utility model belongs to wireless communication technology field, relates to the antenna technology in wireless communication technology, particularly a kind of circular polarized antenna for REID.
Background technology
REID (RFID, Radio Frequency Indentification) is carried out bidirectional data communication by wireless mode, and then target is identified, and is a kind of emerging automatic identification technology.Typical rfid system is made up of electronic tag, read write line and related software.Owing to can completing identification without physical contact between RFID label and read write line, therefore rfid system can be operated in adverse circumstances, and realizes the identification to multiple moving targets.
In rfid system, read write line sends the radiofrequency signal of a certain characteristic frequency by antenna.In the time that label enters this region, label obtains read write line order from radiation field, through tag circuit processing, then sends out self response message such as coding grade.After information is read by read write line and decodes, be sent to the processing of exchanges data administrating system, thereby reach the object of automatic recognition object.As the elementary cell of rfid system, the performance of antenna will directly affect the accuracy that receives and transmit.Dielectric constant is low, loss is high, dielectric behavior is unstable, makes the indexs such as gain, polarization mode, half-power beam width, impedance bandwidth and the polarization bandwidth of antenna be difficult to have breakthrough.
What communicating by letter between the RFID label that is operated in microwave frequency band and reader adopted is the mode of electric wave signal transmission, and the operational environment more complicated of rfid system, various factors affects the reading/writing distance of label, limited and tackle aspect various complex environments in reader power, promoting label readwrite performance has better feasibility than improving reader performance, brings comprehensive raising also more can to the performance of whole system.
Utility model content
The purpose of this utility model is in order to solve the problem that existing 2.45G microwave frequency band RFID reader antenna frequency band is narrow, axial ratio is high and half-power beam width is narrow, improve the reading/writing distance of rfid system, improve the recognition efficiency of label, proposed a kind of micro-band circular polarized antenna based on orthogonal (90 °) hybrid network.
The technical solution of the utility model is: a kind of circular polarized antenna, it is characterized in that, comprise dielectric-slab, antenna-reflected plate and be positioned at the antenna circuit on antenna-reflected plate, antenna circuit comprises quadrature hybrid and distributing point, comprises with quadrature hybrid and be connected aerial radiation sheet by metallic support on dielectric-slab.
Further, the corner location that dielectric-slab is corresponding with antenna-reflected plate arranges through hole, between dielectric-slab and antenna-reflected plate, has the pillar for isolating the two, and by screw, just dielectric-slab and antenna-reflected plate are fixed with pillar two ends respectively at described lead to the hole site.
Further, screw and pillar adopt plastics as material.
Further, described dielectric-slab is FR-4 dielectric-slab.
The beneficial effects of the utility model: the utility model has solved the reading performance issue of the whole rfid system that inventive problem relates to, and through testing and facts have proved that this antenna can effectively improve the axial ratio of circular polarized antenna, improve the reading/writing distance of rfid system, improve the recognition efficiency of label.Utilize micro-its axial ratio of band circular polarized antenna of dual-feed lower, circular polarization characteristics is better, and two-terminal feeding needs the power of feed end input signal to equate, phase difference differs 90 °, and the signal of the output port of orthogonal (90 °) hybrid network output just in time meets the power of signal and equates, phase difference differs 90 ° of such characteristics.Orthogonal (90 °) hybrid network utilizes microstrip line to build, and has simple in structure, stable performance, characteristic cheaply, is applicable to very much batch production.
Brief description of the drawings
Fig. 1 is circular polarized antenna blast structure chart of the present utility model;
Fig. 2 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is further elaborated.
As shown in Figures 1 and 2, a kind of circular polarized antenna of the present embodiment, comprise dielectric-slab 2, antenna-reflected plate 4 and be positioned at the antenna circuit on antenna-reflected plate, antenna circuit comprises quadrature hybrid 6 and distributing point 5, comprises with quadrature hybrid and be connected aerial radiation sheet 8 by metallic support 7 on dielectric-slab 2.The corner location that dielectric-slab is corresponding with antenna-reflected plate arranges through hole, has the pillar 3 for isolating the two between dielectric-slab and antenna-reflected plate, and by screw 1, just dielectric-slab and antenna-reflected plate are fixed with pillar two ends respectively at described lead to the hole site.In order not affect the electromagnetic environment of antenna, above-mentioned screw and pillar preferably adopt plastics as material, and dielectric-slab is FR-4 dielectric-slab.
In order to realize the purpose of this utility model, in the present embodiment structure, by circular polarized antenna radiation fin, feeding network, ground connection reflecting surface, support and FR-4 dielectric substrate form.Wherein aerial radiation sheet is as the electromagnetic field radiation part of whole circular polarization microstrip antenna, the power signal that feeding network transmits radio frequency part is in output port 9 mean allocation, and their phase difference differs 90 °, ground connection reflecting surface reduces the back lobe of antenna, improve the gain of antenna, plastic stent plays a part fixed antenna, the effect that metallic support transmits as signal between feeding network and aerial radiation sheet, and FR-4 is as the substrate of antenna radiation unit and feeding network.
Concrete, the performance parameter of the antenna of the present embodiment in this way: operating frequency, 2400Mhz～2500MHz; Gain, 8dBi; Standing-wave ratio <1.5; Input impedance, 50 ohm; Polarization mode, circular polarization; Axial ratio <3; Half-power beam width, 75 °.
What this antenna adopted is microstrip antenna principle, between antenna radiation unit and ground connection reflecting surface, form a resonant cavity, make antenna resonance in needed frequency range by adjusting the long and wide size of radiating element, for antenna is designed to circular polarization, what the feed of radiation fin adopted is the mode of dual-feed, dual-feed requires the input signal power of two ports to equate, and phase difference differs 90 °.In the diagonal place of radiating element corner cut, make antenna produce the line polarization wave that two groups of amplitude equal phase differ 90 °, these two groups of line polarization waves are at the synthetic circular polarization radiation that just formed of free space simultaneously.What feeding network adopted is orthogonal (90 °) hybrid network, and the signal power of this network output mouth output equates, and phase difference differs 90 °, just in time meets the micro-requirement to input signal with circular polarized antenna input port of dual-port.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present utility model, should be understood to that protection range of the present utility model is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from the utility model essence according to disclosed these technology enlightenments of the utility model, and these distortion and combination are still in protection range of the present utility model.
Claims (3)
1. a circular polarized antenna, it is characterized in that, comprise dielectric-slab, antenna-reflected plate and be positioned at the antenna circuit on antenna-reflected plate, antenna circuit comprises quadrature hybrid and distributing point, on dielectric-slab, comprise with quadrature hybrid and be connected aerial radiation sheet by metallic support, the corner location that dielectric-slab is corresponding with antenna-reflected plate arranges through hole, between dielectric-slab and antenna-reflected plate, have the pillar for isolating the two, by screw, just dielectric-slab and antenna-reflected plate are fixed with pillar two ends respectively at described lead to the hole site.
2. circular polarized antenna according to claim 1, is characterized in that, screw and pillar adopt plastics as material.
3. circular polarized antenna according to claim 1 and 2, is characterized in that, described dielectric-slab is FR-4 dielectric-slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320813263.5U CN203774454U (en) | 2013-12-11 | 2013-12-11 | Circularly polarized antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320813263.5U CN203774454U (en) | 2013-12-11 | 2013-12-11 | Circularly polarized antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203774454U true CN203774454U (en) | 2014-08-13 |
Family
ID=51291608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320813263.5U Expired - Lifetime CN203774454U (en) | 2013-12-11 | 2013-12-11 | Circularly polarized antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203774454U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470642A (en) * | 2015-12-17 | 2016-04-06 | 北京锐安科技有限公司 | Directional antenna |
| CN108054502A (en) * | 2017-11-30 | 2018-05-18 | 苏州优函信息科技有限公司 | Compact-type high-gain recognition circular polarization reader antenna and feeding network preparation method |
| CN111162373A (en) * | 2019-12-13 | 2020-05-15 | 山东冠通智能科技有限公司 | RFID circular polarization air microstrip antenna |
-
2013
- 2013-12-11 CN CN201320813263.5U patent/CN203774454U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470642A (en) * | 2015-12-17 | 2016-04-06 | 北京锐安科技有限公司 | Directional antenna |
| CN108054502A (en) * | 2017-11-30 | 2018-05-18 | 苏州优函信息科技有限公司 | Compact-type high-gain recognition circular polarization reader antenna and feeding network preparation method |
| CN111162373A (en) * | 2019-12-13 | 2020-05-15 | 山东冠通智能科技有限公司 | RFID circular polarization air microstrip antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |