CN103531907A - Small-sized circular polarized ultrahigh-frequency RFID (radio frequency identification) reader fractal antenna - Google Patents
Small-sized circular polarized ultrahigh-frequency RFID (radio frequency identification) reader fractal antenna Download PDFInfo
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- CN103531907A CN103531907A CN201310513069.XA CN201310513069A CN103531907A CN 103531907 A CN103531907 A CN 103531907A CN 201310513069 A CN201310513069 A CN 201310513069A CN 103531907 A CN103531907 A CN 103531907A
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Abstract
The invention relates to an RFID reader antenna, in particular to a small-sized circular polarized ultrahigh-frequency RFID reader fractal antenna. The RFID reader fractal antenna comprises radiation patches, a dielectric substrate and a reflector, wherein the dielectric substrate is a square FR-4 epoxy resin copper-clad plate; the radiation patches comprise five square sheets provided with square holes in the middle, and the square sheets are spliced regularly and cover the dielectric substrate directly; the reflector is a square aluminum plate provided with slots in the central positions of four sides, and is fixed with the dielectric substrate through bolts; and coaxial feeder interfaces are formed in corresponding positions of respective diagonals in the same direction of the radiation patches, the dielectric substrate and the reflector. The small-sized circular polarized ultrahigh-frequency RFID reader fractal antenna has the advantages of small size, long identification range, complete coverage of ultrahigh-frequency band (920-925 MHz) in China, simple production, low cost and the like, and has a good marketing prospect.
Description
Technical field
The present invention relates to RFID reader antenna, be specifically related to a kind of small size, circular polarization ultrahigh frequency RFID reader fractal antenna.
Background technology
RFID radio-frequency (RF) identification is a kind of contactless automatic identification technology, and it is automatically identified destination object and obtained related data by radiofrequency signal, and identification work need not manual intervention, can be operated in adverse circumstances.RFID technology can be identified high-speed moving object and can identify a plurality of labels simultaneously, swift and convenient to operate.
RFID is a kind of simple wireless system, only has two basic devices, and this system is for control, detection and tracking object.System is comprised of an interrogator (or reader) and a lot of transponder (or label).
At present, rfid system is widely used in the aspects such as logistics, production safety, road.Due to be identified the spatial direction of object possibly cannot fix or label to paste mode incorrect, this just requires reader antenna is circular polarized antenna.The circular polarization modulation system of using in existing RFID wireless telecommunication system, can reduce the requirement of system to bandwidth significantly, production, easy for installation, and cost is low, and this just requires reader transmitting antenna is small size.Therefore, provide a kind of meet completely under specific adverse circumstances, apply, small size, circular polarization ultrahigh frequency readers be that this area is needed the problem that will solve badly.
Summary of the invention
The present invention is directed to the existing problem of prior art, a kind of small size, circular polarization ultrahigh frequency RFID reader fractal antenna are provided, this antenna can be applied under specific adverse circumstances.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of small size, circular polarization ultrahigh frequency RFID reader fractal antenna, comprise radiation patch, medium substrate, reflecting plate, described medium substrate is the copper-clad plate of a foursquare FR-4 epoxy resin, described radiation patch comprises that five centres have the square sheets of square hole, the splicing of described square sheets rule directly overlays on described medium substrate, described reflecting plate is the square aluminium sheet that a center on four limits has elongated slot, described reflecting plate is fixed by bolt and described medium substrate, described radiation patch, medium substrate and the reflecting plate correspondence position on an equidirectional diagonal has coaxial feed line interface.
Adopt the present invention of technique scheme, compared with prior art, its advantage and good effect are:
1. overall dimensions is little, can be placed in reader, needn't install separately;
2. microstrip antenna be take FR-4 medium as carrier, adopts coaxial feed mode, in the situation that meeting rfid system performance index, effectively reduces the cost of antenna;
3. antenna is made after small size, can be transmitted larger distance equally, through actual test, RFID communication distance reaches 7m.
4. cost performance is high, and coverage meets the demands.
As preferably, the present invention further technical scheme can be:
Described medium substrate is the FR-4 epoxy resin copper-clad plate of 60mm * 60mm, a thick 3mm.
Described radiation patch is copper sheets, and plating nickel on surface directly overlays on described medium substrate, and at surface coverage green oil.
Described reflecting plate is the square aluminium sheet of 60mm * 60mm, a thick 1mm, and the center on four limits of square aluminium sheet has the wide 2mm at sensing center, the elongated slot of long 24.5mm.
Adopt the present invention of above-mentioned preferred version, its technical parameter can reach: voltage standing wave ratio VSWR<2; Gain>6Db; Working frequency range is 920MHz～925MHz, covers Chinese ultra-high frequency band completely, and centre frequency is 922MHz, centre frequency place return loss<-25Db; Have more the advantage that return loss is little, size is little, cost performance is high.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention medium substrate vertical view.
Fig. 2 is embodiment of the present invention reflecting plate vertical view.
Fig. 3 is embodiment of the present invention radiation patch vertical view.
Fig. 4 is that radiation patch overlays on the schematic diagram on medium substrate.
In figure: medium substrate 1, bolt hole 2, coaxial feed line interface 3, reflecting plate 4, elongated slot 5, radiation patch 6, square hole 7.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, medium substrate 1 is the FR-4 epoxy resin copper-clad plate of 60mm * 60mm, a thick 3mm, can be fine conformal with rfid system, greatly reduce space.
Referring to Fig. 2, reflecting plate 4 is square aluminium sheets of 60mm * 60mm, a thick 1mm, the center on four limits of square aluminium sheet has the elongated slot 5 of the wide 2mm at sensing center, long 24.5mm, object is to guarantee, under the condition of frequency bandwidth and gain, to make frequency move to the scope of 920～925MHz.
Reflecting plate 4 with on medium substrate 1, have the bolt hole 2 that four corresponding diameters are 3mm, both link together by four bolts.
Referring to Fig. 3, Fig. 4, radiation patch 6 is comprised of five copper thin slices of square that have square hole 7, and copper sheets plating nickel on surface, in case oxidation.It is regularly arranged that five copper thin slices of square are pressed shown in Fig. 3, directly overlay on the medium substrate 1 shown in Fig. 1, and at surface coverage green oil.The gain that in radiation patch 6, institute's opening square hole 2 can improve antenna, the scope of expansion frequency band.
Press the fractal antenna that said structure forms, overall dimensions is 60mm * 60mm, voltage standing wave ratio VSWR<2, the gain of antenna>6dBi, the working frequency range of antenna is 920～925MHz, covers Chinese ultra-high frequency band completely, centre frequency 922MHz place return loss<-25Db; Transmission range can reach 7 meters.
Described in the present embodiment, the test result of RFID reader fractal antenna is in Table 1.
Table 1 test result
Claims (4)
1. a small size, circular polarization ultrahigh frequency RFID reader fractal antenna, comprise radiation patch, medium substrate, reflecting plate, it is characterized in that, described medium substrate is the copper-clad plate of a foursquare FR-4 epoxy resin, described radiation patch comprises that five centres have the square sheets of square hole, the splicing of described square sheets rule directly overlays on described medium substrate, described reflecting plate is the square aluminium sheet that a center on four limits has elongated slot, described reflecting plate is fixed by bolt and described medium substrate, described radiation patch, medium substrate and the reflecting plate correspondence position on an equidirectional diagonal has coaxial feed line interface.
2. small size according to claim 1, circular polarization ultrahigh frequency RFID reader fractal antenna, is characterized in that, described medium substrate is the FR-4 epoxy resin copper-clad plate of 60mm * 60mm, a thick 3mm.
3. small size according to claim 1, circular polarization ultrahigh frequency RFID reader fractal antenna, is characterized in that, described radiation patch is copper sheets, and plating nickel on surface directly overlays on described medium substrate, and at surface coverage green oil.
4. small size according to claim 1, circular polarization ultrahigh frequency RFID reader fractal antenna, it is characterized in that, described reflecting plate is the square aluminium sheet of 60mm * 60mm, a thick 1mm, and the center on four limits of square aluminium sheet has the wide 2mm at sensing center, the elongated slot of long 24.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310513069.XA CN103531907A (en) | 2013-10-28 | 2013-10-28 | Small-sized circular polarized ultrahigh-frequency RFID (radio frequency identification) reader fractal antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310513069.XA CN103531907A (en) | 2013-10-28 | 2013-10-28 | Small-sized circular polarized ultrahigh-frequency RFID (radio frequency identification) reader fractal antenna |
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| CN103531907A true CN103531907A (en) | 2014-01-22 |
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| CN201310513069.XA Pending CN103531907A (en) | 2013-10-28 | 2013-10-28 | Small-sized circular polarized ultrahigh-frequency RFID (radio frequency identification) reader fractal antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105631381A (en) * | 2016-03-25 | 2016-06-01 | 福建师范大学 | Electronic tag reader with antenna signal directional enhancing function |
| CN111478031A (en) * | 2020-04-22 | 2020-07-31 | 云南电网有限责任公司电力科学研究院 | Fractal antenna for ultrahigh frequency detection |
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| US20060267842A1 (en) * | 2005-05-27 | 2006-11-30 | Uei-Ming Jow | Vertical complementary fractal antenna |
| CN101383447A (en) * | 2008-10-21 | 2009-03-11 | 厦门大学 | Rectangular wide slit Minkowski split antenna for RFID system |
| CN101789546A (en) * | 2009-04-21 | 2010-07-28 | 天津中启创科技有限公司 | Small fractal intelligent antenna |
| CN202513279U (en) * | 2012-03-30 | 2012-10-31 | 刘智佳 | Ultra-high-frequency (UHF) tag antenna based on fractal processing |
| CN203085760U (en) * | 2013-02-17 | 2013-07-24 | 河北省科技咨询服务中心 | Multi-frequency section fractal double-frequency microstrip antenna |
| CN203503789U (en) * | 2013-10-28 | 2014-03-26 | 唐山赛福特智能控制股份有限公司 | Subsize circular polarization ultrahigh frequency RFID reader fractal antenna |
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2013
- 2013-10-28 CN CN201310513069.XA patent/CN103531907A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060267842A1 (en) * | 2005-05-27 | 2006-11-30 | Uei-Ming Jow | Vertical complementary fractal antenna |
| CN101383447A (en) * | 2008-10-21 | 2009-03-11 | 厦门大学 | Rectangular wide slit Minkowski split antenna for RFID system |
| CN101789546A (en) * | 2009-04-21 | 2010-07-28 | 天津中启创科技有限公司 | Small fractal intelligent antenna |
| CN202513279U (en) * | 2012-03-30 | 2012-10-31 | 刘智佳 | Ultra-high-frequency (UHF) tag antenna based on fractal processing |
| CN203085760U (en) * | 2013-02-17 | 2013-07-24 | 河北省科技咨询服务中心 | Multi-frequency section fractal double-frequency microstrip antenna |
| CN203503789U (en) * | 2013-10-28 | 2014-03-26 | 唐山赛福特智能控制股份有限公司 | Subsize circular polarization ultrahigh frequency RFID reader fractal antenna |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105631381A (en) * | 2016-03-25 | 2016-06-01 | 福建师范大学 | Electronic tag reader with antenna signal directional enhancing function |
| CN111478031A (en) * | 2020-04-22 | 2020-07-31 | 云南电网有限责任公司电力科学研究院 | Fractal antenna for ultrahigh frequency detection |
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Application publication date: 20140122 |