CN106339731A - Automatically adjustable radio frequency carrier cancellation RFID reader-writer - Google Patents
Automatically adjustable radio frequency carrier cancellation RFID reader-writer Download PDFInfo
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- CN106339731A CN106339731A CN201610686467.5A CN201610686467A CN106339731A CN 106339731 A CN106339731 A CN 106339731A CN 201610686467 A CN201610686467 A CN 201610686467A CN 106339731 A CN106339731 A CN 106339731A
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- frequency carrier
- radio
- outfan
- radio frequency
- write line
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention discloses an automatically adjustable radio frequency carrier cancellation RFID reader-writer. The phase and the amplitude of a cancellation signal are adjusted through a vector modulator so that the leakage carrier of the cancellation signal and a receiving channel is enabled to be different for 180 degrees; the amplitude is enabled to be consistent with that of the leakage carrier of the receiving channel so as to realize radio frequency carrier cancellation; besides, the radio frequency carrier cancellation effect is inspected through a detector, and the radio frequency carrier cancellation effect is enabled to reach the standard by adjusting the phase and the amplitude of the vector modulator if the radio frequency carrier cancellation effect is not standard. The common problems of short read-write distance, saturated receiving channel and other defects of the common UHF RFID reader-writers can be compensated; and the defects of the present UHF RFID reader-writers can be greatly compensated and thus the RFID reader-writer has wide application prospect.
Description
Technical field
The invention belongs to electronic information communication technical field is and in particular to a kind of rfid that offsets of adjustable radio-frequency carrier
Read write line.
Background technology
Follow national military standard gjb7377.1-2011 can the rfid read write line offset of radio-frequency carrier of adjust automatically be conventional
Passive backscatter formula rfid system, be mainly made up of rfid read write line and passive label.But due to label antenna
The restriction of size is so that the tag reflection signal that receives of read write line radio-frequency front-end is very faint.On the other hand, due to read write line
When receiving, also to constantly launch continuous carrier to supply energy to label, so will be due to serious while receiving
Carrier wave leakage, lead to the lna of receiver rf front-end or the front end saturation of the down-conversion mixer with gain, thus severe exacerbation
Received signal to noise ratio, leads to read write line identification distance to decline and demodulation bit error rate increase, so that whole read write line performance is drastically declined.
In order to lift the performance of read write line, design a based on can adjust automatically the rfid read-write offset of radio-frequency carrier
Device, it is the effect realizing adjust automatically carrier cancellation based on vector modulator and cymoscope, improves the reception letter of read write line
Make an uproar and compare, make read write line identify that distance greatly improves.
Content of the invention
The present invention be solve above-mentioned technical problem it is proposed that a kind of can adjust automatically radio-frequency carrier offset rfid read-write
Device, to be designed and to develop according to GJB air interface 7377.1-2011 agreement, it is possible to achieve 0～360 degree of tune
Mutually it is also possible to 0～40db amplitude modulation, reach the leakage carrier phase difference 180 degree of phase place and receiving channel, amplitude and leakage carrier wave one
Cause, thus reaching the effect of carrier cancellation.
The technical solution used in the present invention is: can adjust automatically radio-frequency carrier offset rfid read write line, comprising: signal
Sending module, bonder, vector modulator, adder, reception modulation module, cymoscope and antenna, described signal sends mould
The outfan of block is connected with the input of bonder, and described bonder first outfan is connected with antenna, and the second of bonder is defeated
Go out end to be connected with the first input end of vector modulator；Described vector modulator outfan is connected with adder first input end；
The described outfan receiving modulation module is connected with adder second input, and the input of described cymoscope is defeated with adder
Go out end to be connected；The outfan of described cymoscope is connected with the second input of vector modulator.
Further, the phase modulation scope of described phase modulation module is 0～360 degree.
Further, the amplitude modulation range of described amplitude modulation module is 0～40db.
Further, described vector modulator adopts hmc630lp3 chip to realize.
Further, described cymoscope adopts max4003eua chip to realize.
Beneficial effects of the present invention: the present invention can adjust automatically radio-frequency carrier offset rfid read write line, by arrow
Amount manipulator adjusts phase place and the amplitude of offseting signal so that the leakage carrier phase difference 180 degree of offseting signal and receiving channel；Width
Degree is consistent with the leakage carrier amplitude of receiving channel, thus realize radio-frequency carrier offsetting；And by cymoscope to radio-frequency carrier
Neutralization effect is checked, not up to standard in this way, then the phase and amplitude passing through to adjust vector modulator is penetrated so that being better achieved
Frequency carrier cancellation；The application compensate near, receiving channel saturation of common uhf rfid read write line generally existing reading/writing distance etc. no
The problem of foot；Can be very good to make up the deficiency of current uhf rfid read write line, have broad application prospects.
Brief description
Fig. 1 is the rfid read write line high-level schematic functional block diagram of the present invention；
Wherein, 1 expression signal transmitting module；2 expression bonders；3 expression vector modulators；4 expression adders；5 expressions
Receive modulation module；6 expression cymoscopes.
Specific embodiment
For ease of skilled artisan understands that the technology contents of the present invention, below in conjunction with the accompanying drawings one being entered to present invention
Step explaination.
It is illustrated in figure 1 vector modulator schematic diagram in the application, the present invention can the radio-frequency carrier of adjust automatically offset
Rfid read write line, comprising: signal transmitting module 1, bonder 2, vector modulator 3, adder 4, receive modulation module 5, inspection
Ripple device 6 and antenna, the output of described signal transmitting module 1 is connected with the input of bonder 2, and described bonder 2 first is defeated
Go out end to be connected with antenna, bonder 2 second outfan is connected with the input of vector modulator 3；Described vector modulator 3 exports
End is connected with adder 4 first input end；The described outfan receiving modulation module 5 is connected with adder 4 second input, and
Cymoscope 6 is connected with the outfan of adder 4.
Described signal transmitting module 1 is used for producing signal；Described bonder 2 is used for the letter that signal transmitting module 1 is produced
Number coupled, and sent by antenna；Described vector modulator 3 is used for adjusting phase place and the width of coupled rear signal
Degree, forms offseting signal to realize radio-frequency carrier counteracting；Described adder 4 is used for connecing offseting signal with receiving modulation module 5
The signal receiving carries out being added offsets, and described reception modulation module 5 is used for receipt signal, and described cymoscope 6 is used for detecting radio frequency
The effect of carrier cancellation, if the effect that radio-frequency carrier is offset is not up to standard, readjusts the phase place of phase modulation module in vector modulator 3
And the amplitude of amplitude modulation module；Otherwise radio-frequency carrier is offset.
Cymoscope 6 verifies, by detecting the power of receipt signal, the effect that radio-frequency carrier is offset, and such as original reception is believed
Number power be 7dbm, radio-frequency carrier offset after the signal power that detects be changed into -23dbm or less when, reach 30dbm or
The more excellent neutralization effect of person；If the signal power detecting is more than -23dbm, radio-frequency carrier counteracting is not up to standard, needs again to adjust
The amplitude of the phase place of phase modulation module and amplitude modulation module in whole vector modulator 3, then pass through cymoscope Detection results, until it reaches
The preferable neutralization effect of 30dbm or more excellent.Thus reaching the received signal to noise ratio improving read write line, read write line is made to identify that distance is big
Big raising.
The vector modulator of the application adopts max4003eua chip to realize, it can with 0～360 degree of phase modulation it is also possible to 0～
40db amplitude modulation, reaches the leakage carrier phase difference 180 degree of phase place and receiving channel, and amplitude is consistent with revealing carrier wave, thus reaching load
The effect that ripple is offset.Vector modulator includes: phase modulation module and amplitude modulation module, and described phase modulation module is used for offseting signal is carried out
Phase modulation is so that the leakage carrier phase difference 180 degree of offseting signal and receiving channel；Described amplitude modulation module is used for offseting signal is carried out
Amplitude modulation is so that offseting signal is consistent with the leakage carrier amplitude of receiving channel.
The cymoscope of the application adopts max4003eua chip to realize the effect that detection radio-frequency carrier is offset, and works as radio-frequency carrier
Go again when neutralization effect is undesirable to adjust the amplitude of vector modulator and phase place to reach the effect of accurate counteracting.
Those of ordinary skill in the art will be appreciated that, embodiment described here is to aid in reader and understands this
Bright principle is it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.For ability
For the technical staff in domain, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made
Any modification, equivalent substitution and improvement etc., should be included within scope of the presently claimed invention.
Claims (5)
1. can adjust automatically radio-frequency carrier offset rfid read write line it is characterised in that include: signal transmitting module, coupling
Device, vector modulator, adder, reception modulation module, cymoscope and antenna, the outfan of described signal transmitting module and coupling
The input of clutch is connected, and described bonder first outfan is connected with antenna, the second outfan of bonder and Vector Modulation
The first input end of device is connected；Described vector modulator outfan is connected with adder first input end；Described reception modulates mould
The outfan of block is connected with adder second input, and the input of described cymoscope is connected with the outfan of adder；Described
The outfan of cymoscope is connected with the second input of vector modulator.
2. according to claim 1 can adjust automatically the rfid read write line offset of radio-frequency carrier it is characterised in that described
The phase modulation scope of phase modulation module is 0～360 degree.
3. according to claim 1 can adjust automatically the rfid read write line offset of radio-frequency carrier it is characterised in that described
The amplitude modulation range of amplitude modulation module is 0～40db.
4. according to claim 1 can adjust automatically the rfid read write line offset of radio-frequency carrier it is characterised in that described
Vector modulator adopts hmc630lp3 chip to realize.
5. according to claim 1 can adjust automatically the rfid read write line offset of radio-frequency carrier it is characterised in that described
Cymoscope adopts max4003eua chip to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610686467.5A CN106339731A (en) | 2016-08-18 | 2016-08-18 | Automatically adjustable radio frequency carrier cancellation RFID reader-writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610686467.5A CN106339731A (en) | 2016-08-18 | 2016-08-18 | Automatically adjustable radio frequency carrier cancellation RFID reader-writer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106339731A true CN106339731A (en) | 2017-01-18 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610686467.5A Pending CN106339731A (en) | 2016-08-18 | 2016-08-18 | Automatically adjustable radio frequency carrier cancellation RFID reader-writer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282171A (en) * | 2017-12-22 | 2018-07-13 | 深圳市金溢科技股份有限公司 | A kind of self-interference offset device and electronic license plate reader |
| CN108418601A (en) * | 2018-01-26 | 2018-08-17 | 苏州安迪卡普科技有限公司 | A kind of carrier wave cancellation system |
| CN110969034A (en) * | 2019-11-04 | 2020-04-07 | 锐捷网络股份有限公司 | Carrier cancellation circuit and RFID reader-writer |
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| US20090130981A1 (en) * | 2006-04-03 | 2009-05-21 | Takuya Nagai | Radio-frequency communication device |
| JP2009187319A (en) * | 2008-02-06 | 2009-08-20 | Toppan Forms Co Ltd | Rfid inspection system |
| CN202362811U (en) * | 2011-12-02 | 2012-08-01 | 江苏军一物联网股份有限公司 | Ultrahigh frequency RFID self-interference elimination device |
| CN102902939A (en) * | 2012-09-29 | 2013-01-30 | 中国物品编码中心 | Carrier cancellation device |
| CN102915454A (en) * | 2012-10-23 | 2013-02-06 | 深圳市华士精成科技有限公司 | Counteracting method and counteracting circuit for carrier wave of ultrahigh-frequency radio frequency identification device (RFID) reader-writer |
| CN206224527U (en) * | 2016-08-18 | 2017-06-06 | 成都九洲电子信息系统股份有限公司 | Can adjust automatically radio-frequency carrier offset rfid interrogator |
-
2016
- 2016-08-18 CN CN201610686467.5A patent/CN106339731A/en active Pending
Patent Citations (6)
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| US20090130981A1 (en) * | 2006-04-03 | 2009-05-21 | Takuya Nagai | Radio-frequency communication device |
| JP2009187319A (en) * | 2008-02-06 | 2009-08-20 | Toppan Forms Co Ltd | Rfid inspection system |
| CN202362811U (en) * | 2011-12-02 | 2012-08-01 | 江苏军一物联网股份有限公司 | Ultrahigh frequency RFID self-interference elimination device |
| CN102902939A (en) * | 2012-09-29 | 2013-01-30 | 中国物品编码中心 | Carrier cancellation device |
| CN102915454A (en) * | 2012-10-23 | 2013-02-06 | 深圳市华士精成科技有限公司 | Counteracting method and counteracting circuit for carrier wave of ultrahigh-frequency radio frequency identification device (RFID) reader-writer |
| CN206224527U (en) * | 2016-08-18 | 2017-06-06 | 成都九洲电子信息系统股份有限公司 | Can adjust automatically radio-frequency carrier offset rfid interrogator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282171A (en) * | 2017-12-22 | 2018-07-13 | 深圳市金溢科技股份有限公司 | A kind of self-interference offset device and electronic license plate reader |
| CN108282171B (en) * | 2017-12-22 | 2020-06-16 | 深圳市金溢科技股份有限公司 | Self-interference offset device and electronic license plate reader-writer |
| CN108418601A (en) * | 2018-01-26 | 2018-08-17 | 苏州安迪卡普科技有限公司 | A kind of carrier wave cancellation system |
| CN108418601B (en) * | 2018-01-26 | 2020-07-10 | 苏州安迪卡普科技有限公司 | Carrier cancellation system |
| CN110969034A (en) * | 2019-11-04 | 2020-04-07 | 锐捷网络股份有限公司 | Carrier cancellation circuit and RFID reader-writer |
| CN110969034B (en) * | 2019-11-04 | 2022-10-14 | 锐捷网络股份有限公司 | Carrier cancellation circuit and RFID reader-writer |
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