CN202362811U - Ultrahigh frequency RFID self-interference elimination device - Google Patents
Ultrahigh frequency RFID self-interference elimination device Download PDFInfo
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- CN202362811U CN202362811U CN2011204930092U CN201120493009U CN202362811U CN 202362811 U CN202362811 U CN 202362811U CN 2011204930092 U CN2011204930092 U CN 2011204930092U CN 201120493009 U CN201120493009 U CN 201120493009U CN 202362811 U CN202362811 U CN 202362811U
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Abstract
An ultrahigh frequency RFID self-interference elimination device comprises a crystal oscillator, a loop controller, a directional coupler, a vector modulator, a circulator, an amplifier, a combiner, a directional coupler and a detector. Carrier wave signals which is loaded with data through the modulator is divided into two paths through the directional coupler, one path of signal is emitted out through an external antenna after passing the circulator, and the other path of signal is input to the vector modulator, modulated to form an inverted offset signal after being controlled by the loop controller, and input to a first combining end of the combiner after passing through the amplifier. A reflected signal is received and input to the circulator, and input to a second combining end of the combiner along with a carrier wave interference signal is; then the signals are input to the directional coupler after being combined and offset, and input to a decoder through a direct connection end to undergo data discrimination. Combined and offset signals passing a coupling end are input to the detector, then the detected signals are input to the loop controller to undergo loop detection. The device can be used to inhibition carrier leak, improve transmit-receive isolation performance and front end dynamic scope.
Description
Technical field
The utility model belongs to UHF RFID field, is specifically related to improve the technology of 840MHz～960MHz radio-frequency front-end dynamic range and restituted signal quality.
Background technology
In recent years, the fast development of RFID technology, the technical research of association area are also active day by day.Conventional passive reflective rfid system mainly is made up of label (TAG) and read write line (READER).TAG only depends on the electromagnetic energy that receives or sense that electric power is provided, and utilizes the method for modulation antenna load characteristic to transmit data to READER simultaneously, and the volume that helps dwindling the TAG circuit like this is convenient to embed or implanted is used.Yet because area constraints, the used antenna size of label is generally less, and the variable quantity of its equivalent radar reflection sectional area (RCS) is at most 0.05m
2, the reflection modulation signal that causes the reader receiver front end to collect is very faint, and the background reflectance jamming power is very strong.On the other hand; When receiving circuit is opened; Transmission channel must keep the electromagnetic energy radiation to guarantee the energy supply of label; This will cause quite serious local carrier leakage problem, and then promote front-end circuit departs from linear workspace, produce the problems such as deterioration, system's effective reading distance and decoding reliability decrease of received signal to noise ratio.Especially in a single aerial system, the carrier leak problem is even more serious.
For addressing the above problem, the method that often adopts directional coupler and carrier suppressed technology to combine can obtain carrier suppression and improve.But it only can suppress the metastable carrier leak signal of amplitude and phase place, can't suppress the background reflectance undesired signal that signal parameter changes with working environment constantly at all; In addition, this method exists the additional insertion loss up to 10～20dB on the reflected signal path, seriously reduced received signal to noise ratio, causes the decline of effective reading distance inevitably.
Summary of the invention
The purpose of the utility model is the extensity to the RFID technical applications; A kind of adaptive carrier bucking circuit of digital control technology is proposed; Its suppressed carrier leakage effectively, improvement transmitting-receiving isolation performance and front end dynamic range; Can also effectively suppress background reflectance and disturb, the additional insertion loss that the while introduces at receiving cable is very little, and concrete technical scheme is following:
A kind of ultrahigh frequency RFID is characterized in that comprising from disturbing cancellation element:
A, radio-frequency transmissions channel unit: constitute by modulator, directional coupler, circulator and antenna;
B, Vector Modulation unit: constitute by vector modulator, loop control unit, crystal oscillator, wave detector;
C, radio frequency reception channel unit: constitute by combiner, directional coupler and demoder;
The carrier signal that loaded data through modulator is divided into two-way through directional coupler, and first via signal is launched through external antenna through behind the circulator, and the second road signal inputs to vector modulator;
For the second road signal, in vector modulator, the control of process loop control unit modulates the offseting signal of anti-phase, and this offseting signal is sent to first of combiner and closes on the terminal;
For first via signal, the reflected signal that said antenna receives sends circulator to; In circulator, the undesired signal of reflected signal and carrier wave is sent to second of combiner and closes on the terminal; First and second road signal closes in combiner and is sent to directional coupler after offset on the road; One road signal of directional coupler output is sent to demoder through straight-through end and does discriminating data, and another road signal is sent to wave detector, and the signal after the detection inputs to loop control unit and does loop detection; Said crystal oscillator linkloop controller.
Comprise amplifier, amplifier is connected first the closing between the terminal of output terminal and combiner of vector modulator
The principle of the utility model is explained as follows:
At an initial period of reading the cycle; Reader is modulated to the director data that needs send label (TAG) on the carrier wave through modulator earlier, goes out through directional coupler, circulator and aerial radiation, then again; Transmission channel sustained radiation unmodulated carrier signal; So that continual electric power supply is provided for passive label and sensor, receiving cable is started working simultaneously, to extract the reflective information of label.The receiving port signal of circulator is the stack of all kinds of reflected signals and transmitter leaakage signal; Under the control of interference cancellation circuit in loop control unit; After it is controlled the detection of wave detector through loop control unit through offseting signal of vector modulator output, should present the relation of constant amplitude anti-phase with the carrier leak signal in the receiving cable; Offseting signal with receive signal through obtaining the output signal behind the carrier cancellation after the power combiner, input to demoder and make data decision.
The gordian technique of the utility model with according to environmental factor, to the real-time control adjustment of the amplitude of offseting signal and phase place.Relation with the constant amplitude anti-phase of being satisfied with the carrier wave self-interference signal.The utility model has adopted high-precision A/D, the D/A control module core as loop control unit, makes the mass data analysis very fast and vector modulator is sent control command for the external environment condition of continuous variation.
Description of drawings
Fig. 1 is the utility model schematic block circuit diagram.
Embodiment
As shown in Figure 1, a kind of ultrahigh frequency RFID comprises: power interface, crystal oscillator, loop control unit, directional coupler, vector modulator, circulator, amplifier, combiner, directional coupler and wave detector from disturbing cancellation element.The carrier signal that loaded data through modulator is divided into two-way through behind the directional coupler, and one road signal is launched through external antenna through behind the circulator.Another road signal through directional coupler is told inputs to vector modulator, through after the control of loop control unit, modulates the offseting signal of anti-phase, through amplifier, inputs to first of combiner and closes on the terminal.Receive the signal of reflection, input circulator, and the undesired signal of carrier wave input to second of combiner and close on the terminal; Close and input to directional coupler after offset on the road, input to demoder through straight-through end and do discriminating data.Close and input to directional coupler after offset on the road, the signal through coupled end inputs to wave detector, and the signal after the detection inputs to loop control unit and does loop detection.
The design of the circuit that this is routine relies on the application of FR-4 medium substrate, makes the performance of circuit be able to give full play to, and has guaranteed the realization of each item index; And substituted import sheet material with this homemade sheet material, effectively reduced cost and lead time.
The power interface that this example is used makes structure compact, and assembling is simple, dependable performance, and loss is little, is easy to integrated.Used crystal oscillator, loop control unit, directional coupler, vector modulator, circulator, amplifier, combiner, alignment coupling mechanism, wave detector all is that microminiature, height are integrated, the mmic chip of Surface Mount encapsulation in this example; This just guaranteed can be on a circuit board integrated all functional circuits; Greatly reduce the entire circuit volume, be convenient to miniaturization, the integrated design of system.
A series of technical measures are adopted in the crystal oscillator that the utility model is used, loop control unit etc., reach the computation rate height, and computational accuracy is high, and steering logic is technical requirement accurately.
Conventional design need in the associated electromagnetic field simulation software, set up the model of entire device from interference cancellation circuit, set and find the solution correlation parameter so that obtain optimum performance, the utility model also obtains thus.
Claims (2)
1. a ultrahigh frequency RFID is characterized in that comprising from disturbing cancellation element:
A, radio-frequency transmissions channel unit: constitute by modulator, directional coupler, circulator and antenna;
B, Vector Modulation unit: constitute by vector modulator, loop control unit, crystal oscillator, wave detector;
C, radio frequency reception channel unit: constitute by combiner, directional coupler and demoder;
The carrier signal that loaded data through modulator is divided into two-way through directional coupler, and first via signal is launched through external antenna through behind the circulator, and the second road signal inputs to vector modulator;
For the second road signal, in vector modulator, the control of process loop control unit modulates the offseting signal of anti-phase, and this offseting signal is sent to first of combiner and closes on the terminal;
For first via signal, the reflected signal that said antenna receives sends circulator to; In circulator, the undesired signal of reflected signal and carrier wave is sent to second of combiner and closes on the terminal; First and second road signal closes in combiner and is sent to directional coupler after offset on the road; One road signal of directional coupler output is sent to demoder through straight-through end and does discriminating data, and another road signal is sent to wave detector, and the signal after the detection inputs to loop control unit and does loop detection; Said crystal oscillator linkloop controller.
2. a kind of ultrahigh frequency RFID according to claim 1 is characterized in that comprising amplifier from disturbing cancellation element, and amplifier is connected first the closing between the terminal of output terminal and combiner of vector modulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204930092U CN202362811U (en) | 2011-12-02 | 2011-12-02 | Ultrahigh frequency RFID self-interference elimination device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204930092U CN202362811U (en) | 2011-12-02 | 2011-12-02 | Ultrahigh frequency RFID self-interference elimination device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103746713A (en) * | 2013-12-31 | 2014-04-23 | 深圳市远望谷信息技术股份有限公司 | Device and method for suppressing emitting carrier waves in RFID (radio frequency identification) integral reader-writer |
| CN103954956A (en) * | 2014-05-21 | 2014-07-30 | 西安空间无线电技术研究所 | Self-adaptation four-port cancellation network structure and self-adaptation cancellation method |
| CN104123571A (en) * | 2013-04-23 | 2014-10-29 | 深圳市华士精成科技有限公司 | Carrier wave offset circuit based on RFID reader-writer, and RFID reader-writer |
| CN104363031A (en) * | 2014-11-22 | 2015-02-18 | 成都锦江电子系统工程有限公司 | Feedforward adaptive canceling circuit and method for removing carrier leakage |
| CN104616038A (en) * | 2015-01-07 | 2015-05-13 | 浙江海康科技有限公司 | Automatic elimination method of RFID (radio frequency identification device) receiving circuit carrier and circuit thereof, and reader circuit |
| WO2015066874A1 (en) * | 2013-11-07 | 2015-05-14 | 华为技术有限公司 | Self-interference cancellation method and device |
| CN106339731A (en) * | 2016-08-18 | 2017-01-18 | 成都九洲电子信息系统股份有限公司 | Automatically adjustable radio frequency carrier cancellation RFID reader-writer |
| US9900060B1 (en) | 2015-05-12 | 2018-02-20 | Superlative Semiconductor, LLC | Tunable microwave network and application to transmit leakage cancellation circuit in an RFID interrogator |
| CN108881086A (en) * | 2018-06-14 | 2018-11-23 | 武汉万集信息技术有限公司 | The circuit of modulated signal, the method for modulated signal |
| CN110798235A (en) * | 2019-10-28 | 2020-02-14 | 维沃移动通信有限公司 | Terminal control method and electronic equipment |
| CN111294065A (en) * | 2018-12-06 | 2020-06-16 | 航天信息股份有限公司 | Carrier cancellation circuit and method |
| US10972150B2 (en) | 2017-12-04 | 2021-04-06 | Superlative Semiconductor, LLC | Low-cost software-defined RFID interrogator with active transmit leakage cancellation |
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2011
- 2011-12-02 CN CN2011204930092U patent/CN202362811U/en not_active Expired - Fee Related
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902939A (en) * | 2012-09-29 | 2013-01-30 | 中国物品编码中心 | Carrier cancellation device |
| CN102902939B (en) * | 2012-09-29 | 2015-07-22 | 中国物品编码中心 | Carrier cancellation device |
| CN102915454B (en) * | 2012-10-23 | 2015-09-16 | 深圳市华士精成科技有限公司 | A kind of ultrahigh frequency radio frequency identification (RFID) reader carrier cancellation approach and bucking circuit |
| 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 |
| CN104123571A (en) * | 2013-04-23 | 2014-10-29 | 深圳市华士精成科技有限公司 | Carrier wave offset circuit based on RFID reader-writer, and RFID reader-writer |
| CN104123571B (en) * | 2013-04-23 | 2017-09-08 | 深圳市华士精成科技有限公司 | A kind of carrier cancellation circuit and RFID reader based on RFID reader |
| WO2015066874A1 (en) * | 2013-11-07 | 2015-05-14 | 华为技术有限公司 | Self-interference cancellation method and device |
| CN105324942B (en) * | 2013-11-07 | 2017-06-06 | 华为技术有限公司 | A kind of self-interference cancellation method and device |
| CN105324942A (en) * | 2013-11-07 | 2016-02-10 | 华为技术有限公司 | Self-interference cancellation method and device |
| EP3043483A4 (en) * | 2013-11-07 | 2016-09-28 | Huawei Tech Co Ltd | Self-interference cancellation method and device |
| CN103746713A (en) * | 2013-12-31 | 2014-04-23 | 深圳市远望谷信息技术股份有限公司 | Device and method for suppressing emitting carrier waves in RFID (radio frequency identification) integral reader-writer |
| CN103746713B (en) * | 2013-12-31 | 2016-02-24 | 深圳市远望谷信息技术股份有限公司 | The device and method launching carrier wave is suppressed in RFID integral type read write line |
| CN103954956A (en) * | 2014-05-21 | 2014-07-30 | 西安空间无线电技术研究所 | Self-adaptation four-port cancellation network structure and self-adaptation cancellation method |
| CN104363031A (en) * | 2014-11-22 | 2015-02-18 | 成都锦江电子系统工程有限公司 | Feedforward adaptive canceling circuit and method for removing carrier leakage |
| CN104363031B (en) * | 2014-11-22 | 2017-01-11 | 成都锦江电子系统工程有限公司 | Feedforward adaptive canceling circuit and method for removing carrier leakage |
| CN104616038A (en) * | 2015-01-07 | 2015-05-13 | 浙江海康科技有限公司 | Automatic elimination method of RFID (radio frequency identification device) receiving circuit carrier and circuit thereof, and reader circuit |
| CN104616038B (en) * | 2015-01-07 | 2018-04-27 | 浙江海康科技有限公司 | The automatic removing method of RFID reception circuit carrier and circuit and reader circuitry |
| US9900060B1 (en) | 2015-05-12 | 2018-02-20 | Superlative Semiconductor, LLC | Tunable microwave network and application to transmit leakage cancellation circuit in an RFID interrogator |
| US10187120B1 (en) | 2015-05-12 | 2019-01-22 | Superlative Semiconductor, LLC | Tunable microwave network and application to transmit leakage cancellation circuit in an RFID interrogator |
| CN106339731A (en) * | 2016-08-18 | 2017-01-18 | 成都九洲电子信息系统股份有限公司 | Automatically adjustable radio frequency carrier cancellation RFID reader-writer |
| US10972150B2 (en) | 2017-12-04 | 2021-04-06 | Superlative Semiconductor, LLC | Low-cost software-defined RFID interrogator with active transmit leakage cancellation |
| CN108881086A (en) * | 2018-06-14 | 2018-11-23 | 武汉万集信息技术有限公司 | The circuit of modulated signal, the method for modulated signal |
| CN108881086B (en) * | 2018-06-14 | 2021-05-11 | 武汉万集信息技术有限公司 | Circuit for modulating signal and method for modulating signal |
| CN111294065A (en) * | 2018-12-06 | 2020-06-16 | 航天信息股份有限公司 | Carrier cancellation circuit and method |
| CN111294065B (en) * | 2018-12-06 | 2022-02-22 | 航天信息股份有限公司 | Carrier cancellation circuit and method |
| CN110798235A (en) * | 2019-10-28 | 2020-02-14 | 维沃移动通信有限公司 | Terminal control method and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CAIHUA SCIENCE-TECHNOLOGY GROUP CO., LTD., NANJING Effective date: 20121009 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Jun Inventor after: OUYANG JIANWEI Inventor after: Yan Xiuchen Inventor after: Yu Quan Inventor before: Zhang Jun Inventor before: OUYANG JIANWEI Inventor before: Yan Xiuchen |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHANG JUN OUYANG JIANWEI YAN XIUCHEN TO: ZHANG JUN OUYANG JIANWEI YAN XIUCHEN YU QUAN |
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| TR01 | Transfer of patent right |
Effective date of registration: 20121009 Address after: Qixia District of Nanjing City, Jiangsu province 210049 horses outside Zhongshan Tsing Ma No. 1 North Street Patentee after: JIANGSU JUNYI INTERNET OF THINGS CO., LTD. Patentee after: NANJING CAIHUA TECHNOLOGY GROUP CO., LTD. Address before: Qixia District of Nanjing City, Jiangsu province 210049 horses outside Zhongshan Tsing Ma No. 1 North Street Patentee before: JIANGSU JUNYI INTERNET OF THINGS CO., LTD. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20131202 |