CN103715499B - Annular UHF near-field RFID reader-writer antenna - Google Patents
Annular UHF near-field RFID reader-writer antenna Download PDFInfo
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- CN103715499B CN103715499B CN201310691617.8A CN201310691617A CN103715499B CN 103715499 B CN103715499 B CN 103715499B CN 201310691617 A CN201310691617 A CN 201310691617A CN 103715499 B CN103715499 B CN 103715499B
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Abstract
Disclosure annular UHF near-field RFID reader-writer antenna, this antenna is planar structure, including feed port, loop configuration, parasitic arc paster and medium substrate；Loop configuration is made up of the first arc paster, the second arc paster and build-out resistor；One end of first arc paster connects feed port, and the other end is connected with build-out resistor；One end of the build-out resistor other end and the second arc paster is connected；The other end of the second arc paster is connected with feed port；Parasitic arc paster is positioned at outside loop configuration, and inner edges is equal everywhere to the outer peripheral distance of loop configuration；Loop configuration, parasitic arc paster and feed port are all on the same surface of medium substrate；Antenna is overall symmetrical about antenna axis.The present invention has the features such as near field magnetic field intensity is high, far gain is low, volume is little, processing and fabricating is convenient, cost is low, it is adaptable to various hyperfrequency near field RFID systems, is particularly well-suited to super low-power consumption handheld device.
Description
Technical field
The present invention relates to a kind of near field radio frequency identification (RFID) reading and writing device antenna, be specifically related to a kind of annular hyperfrequency (UHF) near field RFID reader-writer antenna.
Background technology
RF identification (RFID) technology, is a kind of carried out contactless bidirectional data communication by wireless radio frequency mode, target is identified and obtains the automatic identification technology of relevant information.The operating frequency of RF identification includes being most widely used of low frequency (135KHz), high frequency (13.56MHz), hyperfrequency (860-960MHz) and microwave frequency band (more than 2.4GHz), its medium-high frequency and hyperfrequency.Reading and writing device antenna plays irreplaceable effect in radio-frequency recognition system.Recently as the proposition of single grade RFID application, the ultrahigh frequency RFID system of near-field coupling is utilized more and more to be paid attention to.Hyperfrequency near field RFID systems is more applied to the fields such as retail business, pharmaceutical sector, valuables tracking.One of ultrahigh frequency near field RFID reader-writer antenna key technology becoming near field RFID systems, it directly affects read range and reads distance.
Ultrahigh frequency near field RFID reader-writer antenna obtains a lot of research in recent years, have devised various based on segmented couples loop aerial, the LHM loop aerial loading loop aerial, lumped capacity loading phase compensation etc..These antenna common feature is to adopt to make the electric current on ring keep homophase someway, thus can go out stronger more uniform magnetic field at annular region internal induction.But present these antenna is substantially TV university antenna, antenna volume is relatively big, and magnetic field intensity is not high, is difficult in low-power consumption Mobile portable handheld device.Therefore can be used for the miniaturization UHF near-field RFID reader-writer antenna of mobile hand-held device and there is very big demand.
Summary of the invention
The present invention, in order to overcome TV university near field antenna to be not used to more greatly the deficiency of Mobile portable equipment because of volume, adapts to the feature of handheld device low-power consumption, and puts forward a kind of annular UHF near-field RFID reader-writer antenna.This antenna near-field magnetic field intensity is high, far gain is little, volume is little, cost is low, easy to process.
The purpose of the present invention is achieved through the following technical solutions:
Annular UHF near-field RFID reader-writer antenna, described antenna is planar structure, including feed port, loop configuration, parasitic arc paster and medium substrate；Loop configuration is made up of the first arc paster, the second arc paster and build-out resistor；One end of first arc paster connects feed port, and the other end is connected with one end of build-out resistor；One end of the build-out resistor other end and the second arc paster is connected.The other end of the second arc paster is connected with feed port；Parasitic arc paster is positioned at outside loop configuration, and inner edges is equal everywhere to the outer peripheral distance of loop configuration；Loop configuration, parasitic arc paster and feed port are all on the same surface of medium substrate；Antenna is overall symmetrical about antenna axis；
Described loop configuration can be annulus, Fang Huan, elliptical ring, rhombus ring and other annular.
The material of described the first arc paster, the second arc paster, feed port and parasitic arc paster can be copper, silver, electrically conductive ink and other there is the material of better electric conductivity.
Described medium substrate is ceramic material, epoxy resin fiberglass plate and paper material and other PCB medium substrate.
Relative to prior art, present invention have the advantage that
(1) antenna is planar structure, simple in construction, it is easy to processing.
(2) antenna size is little, has the feature of miniaturization, it is possible to for, in various UHF near field RFID systems, being particularly suitable in the system of portable hand-held.
(3) internal magnetic field intensity in antenna near-field region is strong, utilizes relatively low power also can obtain bigger reading distance, can be used in the UHF near field RFID systems of various low-power consumption.
(4) Antenna Far Field gain is low, it is possible to reduce misreading other far-field tags, can reduce the interference to other system simultaneously.
(5) present invention can be applicable to uhf band, it may be assumed that in 860MHz～960MHz frequency range, is a near field RFID reader-writer antenna with stronger near field magnetic field intensity and relatively low far gain.
Accompanying drawing explanation
Fig. 1 is the structural representation of annular UHF near-field RFID reader-writer antenna；
Fig. 2 is the reflection coefficient chart of antenna in embodiment；
Fig. 3 is the gain curve figure of antenna in embodiment；
Fig. 4 emulates the magnetic field intensity H changed in the antenna surface obtained along X-axis and Y-axis in embodimentzCurve.
Specific embodiments
Below in conjunction with accompanying drawing, specific embodiment of the invention process is elaborated, but the scope of protection of present invention is not limited to the scope of lower example statement.
With reference to Fig. 1, the annular UHF near-field RFID reader-writer antenna of the present invention is made up of feed port 1, loop configuration 2, parasitic arc paster 3 and medium substrate 4；Loop configuration is made up of first arc paster the 5, second arc paster 6 and build-out resistor 7；One end of first arc paster 5 connects feed port 1, and the other end is connected with one end of build-out resistor 7；One end of build-out resistor 7 other end and the second arc paster 6 is connected.The other end of the second arc paster 6 is connected with feed port 1；Parasitic arc paster 3 is positioned at outside loop configuration, and inner edges is equal everywhere to the outer peripheral distance of loop configuration；Feed port 1, loop configuration 2 and parasitic arc paster 3 are all printed on the same surface of medium substrate 4；Antenna is overall symmetrical about antenna axis；
What loop configuration 2 adopted in the present embodiment is circular ring structure, and first arc paster the 5, second arc paster 6 and parasitic arc paster 3 are circular arc.When medium substrate is determined, the radius of circular ring structure 2, parasitic arc paster 3 arc length and parasitic arc paster 3 and circular ring structure 2 between the resonant frequency of spacing joint effect antenna.The radius of circular ring structure 2 its girth more big is more long, and the path that electric current flows through is more long, and antenna resonant frequency is more low.Parasitic arc paster 3 is equivalent to loop configuration 2 is carried out inductance, capacitive load.The arc length of parasitic arc paster 3 increases, and increases loaded cable and loading capacitance, so that antenna resonant frequency is more little simultaneously.Reduce the spacing between parasitic arc paster 3 and loop configuration 2 so that loading capacitance increases, so that antenna resonant frequency reduces.Build-out resistor 7 is used to antenna is mated, and chooses the build-out resistor 7 of suitable size, it is possible to antenna is mated preferably.Owing to build-out resistor 7 consumes certain energy so that the far gain of antenna is very low.Owing to the girth of loop configuration 2 is less than the half of operating frequency of antenna wavelength, electric current keeps homophase in loop configuration 2 and parasitic arc paster 3, thus makes to create stronger magnetic field inside loop configuration 2.For TV university near field antenna, owing to antenna size is less, the magnetic field that under identical input power, the internal magnetic field intensity produced of loop configuration 2 produces much larger than TV university near field antenna, so when small-power inputs, inventive antenna still has stronger magnetic field.
The antenna overall dimensions of this example is 30mm × 30mm × 1mm, and the radius of loop configuration 2 is 13mm, and the spacing between parasitic arc paster 3 and loop configuration is 0.5mm.Can be seen that antenna reflection coefficient is respectively less than-10dB in the frequency range (860-960MHz) at UHFRFID place from Fig. 2 result.Antenna Far Field gain is respectively less than-13.5dBi in whole frequency band as can be seen from Figure 3.From fig. 4, it can be seen that along the magnetic field intensity of X-axis and Y-axis more than 16(A/m, dB in antenna surface), much larger than magnetic field intensity produced by the UHF near-field RFID reader-writer antenna of other form.In this embodiment, antenna is the citing to antenna structure size, does not represent the minima that this structure can be accomplished.
Annular UHF near-field RFID reader-writer antenna of the present invention is planar structure, simple in construction, and volume is little, it is easy to processing, cost is low, can produce stronger magnetic field, can be used for, in various UHF near field RFID systems, being particularly well-suited to the handheld device of low-power consumption.This Antenna Far Field gain is low, it is possible to reduce misreading other far-field tags, can reduce the interference to other system simultaneously.
Claims (1)
1. annular UHF near-field RFID reader-writer antenna, it is characterised in that: antenna is planar structure, including feed port, loop configuration, parasitic arc paster and medium substrate；Wherein loop configuration is made up of the first arc paster, the second arc paster and build-out resistor；One end of first arc paster connects feed port, and the other end is connected with one end of build-out resistor, and the other end of build-out resistor and one end of the second arc paster are connected；The other end of the second arc paster is connected with feed port；Parasitic arc paster is positioned at outside loop configuration, and inner edges is equal everywhere to the outer peripheral distance of loop configuration；Loop configuration, parasitic arc paster and feed port are all on the same surface of medium substrate；Antenna is overall symmetrical about antenna axis；Described loop configuration is annulus, Fang Huan, elliptical ring or rhombus ring；The material of described the first arc paster, the second arc paster, feed port and parasitic arc paster is copper, silver or electrically conductive ink；Described medium substrate is ceramic material, epoxy resin fiberglass plate or paper material；The girth of loop configuration is less than the half of operating frequency of antenna wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310691617.8A CN103715499B (en) | 2013-12-17 | 2013-12-17 | Annular UHF near-field RFID reader-writer antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310691617.8A CN103715499B (en) | 2013-12-17 | 2013-12-17 | Annular UHF near-field RFID reader-writer antenna |
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| Publication Number | Publication Date |
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| CN103715499A CN103715499A (en) | 2014-04-09 |
| CN103715499B true CN103715499B (en) | 2016-06-29 |
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| CN201310691617.8A Expired - Fee Related CN103715499B (en) | 2013-12-17 | 2013-12-17 | Annular UHF near-field RFID reader-writer antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6470132B2 (en) * | 2015-06-26 | 2019-02-13 | マスプロ電工株式会社 | Antenna device |
| CN108232440B (en) * | 2017-12-29 | 2020-09-22 | 吉林大学 | Ground penetrating radar pavement vertical crack detection method of directional ultra-wideband magnetic dipole antenna |
| CN108321516A (en) * | 2018-01-17 | 2018-07-24 | 西安九天无限智能科技有限公司 | A kind of miniaturization PCB slot antennas |
| TWI666825B (en) * | 2018-06-08 | 2019-07-21 | 耀登科技股份有限公司 | Information carrier and tag antenna structure thereof |
| CN110768000B (en) * | 2019-09-27 | 2020-12-01 | 宁波大学 | Ultrahigh frequency RFID (radio frequency identification) tag antenna for wirelessly measuring dielectric constant |
| CN111211399B (en) * | 2020-03-04 | 2021-10-26 | 电子科技大学 | Metal-resistant ultrahigh frequency electronic tag antenna conformal to petroleum pipe sleeve wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1725235A (en) * | 2004-07-21 | 2006-01-25 | 上海飞乐音响股份有限公司 | Remote contactless IC card read write antenna |
| US7876227B2 (en) * | 2008-05-29 | 2011-01-25 | Symbol Technologies, Inc. | Polarization insensitive antenna for handheld radio frequency identification readers |
| CN201741175U (en) * | 2010-04-06 | 2011-02-09 | 广州市远望谷信息技术有限公司 | Honeybee electronic tag |
| CN202662799U (en) * | 2012-06-25 | 2013-01-09 | 中国计量学院 | Diamond coplanar multi-band micro-strip antenna |
| CN203644940U (en) * | 2013-12-17 | 2014-06-11 | 华南理工大学 | Annular UHF near field RFID reader-writer antenna |
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