WO2012034335A1 - Dispositif et procédé pour permettre une annulation de fuite de fréquence radio et lecteur d'identification par fréquence radio (rfid) - Google Patents

Dispositif et procédé pour permettre une annulation de fuite de fréquence radio et lecteur d'identification par fréquence radio (rfid) Download PDF

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Publication number
WO2012034335A1
WO2012034335A1 PCT/CN2010/080033 CN2010080033W WO2012034335A1 WO 2012034335 A1 WO2012034335 A1 WO 2012034335A1 CN 2010080033 W CN2010080033 W CN 2010080033W WO 2012034335 A1 WO2012034335 A1 WO 2012034335A1
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WIPO (PCT)
Prior art keywords
signal
phase
cancellation
reference signal
leakage
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PCT/CN2010/080033
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English (en)
Chinese (zh)
Inventor
曹诚
黄蓓
杨艳秋
曾祥希
赵波
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中兴通讯股份有限公司
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Publication of WO2012034335A1 publication Critical patent/WO2012034335A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field

Definitions

  • the present invention relates to the field of radio frequency identification reader radio frequency circuit technologies, and in particular, to a device and method for implementing radio frequency leakage cancellation and a radio frequency identification reader.
  • a UHF (Ultra High Frequency) passive reader receives a radio frequency identification (RFID) tag signal
  • RFID radio frequency identification
  • the protocol stipulates that the reader needs to transmit a high power.
  • a single-carrier RF signal that provides the tag with the energy needed to start up and function properly. This means that the reader needs to transmit a high-power RF signal with the same frequency as the received signal while receiving the tag signal.
  • this high power forward signal will leak some energy to the reader's reverse receiving channel.
  • This leakage signal and the backscattered signal of the tag enter the receiving portion of the reader at the same time, and the power of the leakage signal is much higher than the power of the tag signal.
  • the power of the leakage signal is generally about 5dbm ⁇ 1 Odbm
  • the power of the tag signal is generally on the order of -50dbm ⁇ -60dbm. In this way, the leakage signal and the tag signal have the same frequency and exist at the same time, such a high-power leakage signal will seriously affect the operation of the reverse receiving circuit.
  • An object of the present invention is to provide an apparatus and method for implementing radio frequency leakage cancellation and a radio frequency identification reader to solve the problem that a leakage signal generated by a prior art radio frequency identification reader when receiving a tag signal affects system operation and reduces The technical problem of the receiver's receiving sensitivity.
  • the present invention provides a device for implementing radio frequency leakage cancellation, which is used for canceling a leakage signal leaking to a reverse receiving channel in a forward radio frequency signal transmitted by a radio frequency identification reader, including: a coupler for coupling a first reference signal from a forward RF signal transmitted by the RFID reader; a cancellation signal generating circuit for generating a cancellation signal according to the first reference signal; The leakage signal is subjected to cancellation processing by using the cancellation signal, and the amplitude of the leakage signal after the cancellation processing is smaller than the amplitude of the original leakage signal.
  • the device wherein the cancellation signal generating circuit comprises: a four-channel phase detection module, comprising: a first phase shifting unit, configured to perform a second reference signal obtained according to the first reference signal Phase shift processing obtains a four-way phase shift reference signal, and the phase shift of the four-way phase shift reference signal is 0. 90. 180.
  • a four-channel phase detection module comprising: a first phase shifting unit, configured to perform a second reference signal obtained according to the first reference signal Phase shift processing obtains a four-way phase shift reference signal, and the phase shift of the four-way phase shift reference signal is 0. 90. 180.
  • phase detecting unit configured to use the four-channel phase-shift reference signal as a reference signal, and project the input leakage signal into four baseband signals, where the four baseband signals include: two-way differential in-phase a signal and two differential quadrature signals; four analog integration modules, each of the analog integration modules for integrating one of the four baseband signals and outputting an integrated signal; a four-way multiplier module, including a second phase shifting unit, configured to perform phase shift processing on the third reference signal obtained according to the first reference signal to obtain a four-way phase-shift reference signal, wherein the phase shifting of the four-way phase-shifting reference signal is 0 respectively .
  • the device wherein the phase of the radio frequency cancellation signal and the leakage signal are.
  • the device, wherein the combiner is further configured to input the combined signal as a new leakage signal.
  • the cancellation signal generating circuit further comprises: a first phase shifting network disposed between the coupler and the four-bit phase detecting module; a second phase shifting network, setting Between the coupler and the four-bit multiplier module.
  • the device wherein the cancellation signal generating circuit further comprises: a power divider connected to the combiner for dividing the first reference signal output by the coupler into the first road a reference signal and a second first reference signal; a first attenuator, configured to attenuate the first reference signal of the first path, and input the attenuated signal into the first phase shifting network; And configured to attenuate the second path first reference signal, and input the attenuated signal into the second phase shifting network.
  • a power divider connected to the combiner for dividing the first reference signal output by the coupler into the first road a reference signal and a second first reference signal
  • a first attenuator configured to attenuate the first reference signal of the first path, and input the attenuated signal into the first phase shifting network
  • And configured to attenuate the second path first reference signal, and input the attenuated signal into the second phase shifting network.
  • the device wherein the cancellation signal generating circuit further comprises: four filtering modules, each filtering module being connected to one of the four analog integration modules, for inputting an analog integration module The baseband signal is subjected to filtering processing; and the amplifying module is configured to amplify the radio frequency cancellation signal before the radio frequency cancellation signal output by the four-way multiplier module is input to the combiner.
  • the apparatus wherein the multiplier unit realizes a pair by multiplying the four-way phase-shift reference signal by four integrated signals output by the four analog integration modules The four integrated signals output by the four analog integration modules are modulated.
  • a radio frequency identification reader including: a radio frequency leakage cancellation device, configured to cancel a leakage signal leaking to a reverse receiving channel in a forward radio frequency signal transmitted by a radio frequency identification reader
  • the device for canceling radio frequency leakage further includes: a coupler, configured to obtain a first reference signal from a forward radio frequency signal transmitted by the radio frequency identification reader; a cancellation signal generating circuit, configured to generate a cancellation signal according to the first reference signal; a combiner, configured to perform cancellation processing on the leakage signal by using the cancellation signal, and after the cancellation processing The amplitude of the signal is less than the amplitude of the original leakage signal.
  • the radio frequency identification reader wherein the cancellation signal generation circuit comprises: a four-channel phase detection module, comprising: a first phase shifting unit, configured to acquire a second phase obtained according to the first reference signal The reference signal is subjected to phase shift processing to obtain a four-way phase shift reference signal, and the phase shift of the four-way phase shift reference signal is 0 respectively.
  • a four-channel phase detection module comprising: a first phase shifting unit, configured to acquire a second phase obtained according to the first reference signal
  • the reference signal is subjected to phase shift processing to obtain a four-way phase shift reference signal, and the phase shift of the four-way phase shift reference signal is 0 respectively.
  • phase detecting unit for the reference signal is a four phase-shifted reference signal, the leakage signal input baseband signal into four projectors, the four base band signal comprises: Two differential in-phase signals and two differential quadrature signals; four analog integration modules, each of which is used to integrate one of the four baseband signals and output an integrated signal;
  • the path multiplier module includes: a second phase shifting unit, configured to perform phase shift processing on the third reference signal obtained according to the first reference signal to obtain a four-way phase shift reference signal, the four-way phase shift reference signal The phase shifts are 0 respectively.
  • a multiplier unit configured to modulate the four integrated signals output by the four analog integration modules with the four-way phase-shift reference signal as a reference signal to obtain one-way use A radio frequency cancellation signal for the cancellation of the leakage signal.
  • a method for implementing radio frequency leakage cancellation for canceling a leakage signal leaking to a reverse receiving channel in a forward radio frequency signal transmitted by a radio frequency identification reader, wherein the implementation includes an RF leakage pair
  • the device performs the following steps: Step A: obtaining a first reference signal from a forward RF signal transmitted by the RFID reader; Step B, generating a cancellation signal according to the first reference signal; Step c: Perform cancellation processing on the leakage signal by using the cancellation signal, and the amplitude of the leakage signal after the cancellation processing is smaller than the amplitude of the original leakage signal.
  • the method wherein the step 4 includes: Step B1, performing phase shift processing on the first reference signal to obtain a four-way phase shift reference signal, the four-way shift reference signal
  • the movements are divided into 'J is 0 ⁇ , 90 ⁇ , 180 ⁇ , and 270.
  • the four-channel phase-shift reference signal as a reference signal, and projecting the input leakage signal into four baseband signals, where the four baseband signals include: two differential in-phase signals and two differential orthogonal signals; Step ⁇ 2, integrating the four baseband signals respectively; Step ⁇ 3, performing phase shift processing on the first reference signal to obtain a four-way phase shift reference signal, and shifting the four-channel shifting 4-head reference signal by four They are 0 respectively. 90. 180.
  • the method after the step C, further includes: using the combined signal as a new leakage signal, and proceeding to step ⁇ , repeating step ⁇ to step C until the radio frequency The cancellation signal is completely cancelled against the leakage signal.
  • the technical effect of the present invention is: The technical solution of the present invention provides a leakage cancellation device implemented by using an analog circuit, which is compact in structure, and avoids the defect that the leakage signal affects the reverse reception performance of the reader when the passive reader operates.
  • FIG. 1 is a schematic diagram of a schematic diagram of an apparatus for implementing radio frequency leakage cancellation according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of an internal structure of a four-channel phase detection module according to an embodiment of the present invention
  • the invention provides a device for implementing radio frequency leakage cancellation, which is used for canceling a leakage signal leaking to a reverse receiving channel in a forward radio frequency signal transmitted by a radio frequency identification reader, including: a coupler for The forward RF signal transmitted by the RFID reader is coupled to obtain a first reference signal; the cancellation signal generating circuit is configured to generate a cancellation signal according to the first reference signal; and the combiner is configured to use the cancellation signal to the leakage signal The cancellation process is performed, and the amplitude of the leakage signal processed by the combiner is smaller than the amplitude of the original leakage signal.
  • the cancellation signal generating circuit includes: a four-channel phase detection module, comprising: a first phase shifting unit, configured to perform phase shift processing on the second reference signal obtained according to the first reference signal Obtain a four-way phase-shift reference signal, and the phase shift of the four-way phase-shift reference signal is 0. 90. 180. , and 270.
  • the phase detection unit is configured to use the four-way phase-shift reference signal as a reference signal to project the input leakage signal into four baseband signals, and the four baseband signals include: two differential in-phase signals and two differential orthogonalities Signal; four analog integration modules, each analog integration module is used to integrate one of the four baseband signals, and output an integrated signal; a four-way multiplier module, including: a second phase shifting unit, for The third reference signal obtained by the reference signal is subjected to phase shift processing to obtain a four-way phase shift reference signal, and the phase shift of the four-way phase shift reference signal is respectively zero. 90. 180.
  • the phase difference between the phase of the radio frequency cancellation signal and the leakage signal is 90. ⁇ 270.
  • the phase of the radio frequency cancellation signal is opposite to the phase of the leakage signal.
  • the combiner is further configured to input the combined signal as a new leakage signal into the four-way phase detection module.
  • the cancellation signal generating circuit further comprises: a first phase shifting network, disposed between the coupler and the four-bit phase detecting module; and a second phase shifting network, disposed in the coupler and the fourth Between bit multiplier modules.
  • the cancellation signal generating circuit further includes: a power divider connected to the coupler, configured to divide the first reference signal output by the coupler into the first reference signal of the first path And a second first reference signal; a first attenuator for attenuating the first reference signal of the first path, and inputting the attenuated signal to the first phase shifting network; and a second attenuator for the second The first reference signal is attenuated, and the attenuated signal is input to the second phase shifting network.
  • the cancellation signal generating circuit further includes: four filtering modules, each filtering module is connected to one of the four analog integration modules, and is used for baseband signals input to the analog integration module.
  • the amplifying module is configured to amplify the radio frequency cancellation signal before the radio frequency cancellation signal input combiner outputted by the four-way multiplier module.
  • the multiplier unit realizes output of the four analog integral modules by multiplying the four phase shift reference signals by the four integrated signals output by the four analog integration modules. The four integrated signals are modulated.
  • FIG. 1 is a schematic diagram of the principle of an apparatus for implementing radio frequency leakage cancellation according to an embodiment of the present invention.
  • the apparatus for implementing radio frequency leakage cancellation includes: a directional coupler 101, an antenna 102, a Wilkinson splitter 103, a first attenuator 104, a first phase shifting network 105, and a first active filter.
  • Circuit 106 first analog integrator 107, second attenuator 108, second active filter circuit 109, second analog integrator 110, second phase shifting network 111, quad phase detection module 112, Wilkinson combiner 113
  • FIG. 2 is a schematic diagram showing the internal structure of a four-channel phase detection module in an apparatus for implementing radio frequency leakage cancellation according to an embodiment of the present invention.
  • the four-channel phase detection module of the embodiment of the present invention includes: a second 0° phase shifter 201, a first phase detector 202, a first 0° phase shifter 203, and a first 180° phase shifter 204.
  • Second phase detector 205 first 90.
  • Phase shifter 206 third zero.
  • Phase shifter 209 fourth phase detector 210.
  • FIG. 3 is a schematic diagram showing internal results of a four-way multiplier module in an apparatus for implementing radio frequency leakage cancellation according to an embodiment of the present invention.
  • the four-way multiplier module obtains a radio frequency signal by multiplying four quadrature phase-shifted reference signals with the input four-baseband signals, thereby realizing the modulation of the input four baseband signals into radio frequency signals.
  • the four-way multiplier module of the embodiment of the present invention includes: a first multiplier 301 and a second zero. Phase shifter 302, first zero. Phase shifter 303, second multiplier 304, first 180. Multiplier 305, third multiplier 306, third zero. Phase shifter 307, first 90. Phase shifter 308, fourth multiplier 309, second 180. Multiplier 310.
  • the principle of implementing radio frequency leakage cancellation in the device of the embodiment of the present invention will be described below with reference to FIG. 1 , FIG.
  • a device for implementing radio frequency leakage cancellation uses a directional coupler 101 to couple a portion of energy from a forward radio frequency signal transmitted by a passive RFID reader as a total reference signal (ie, a first reference signal).
  • a directional coupler with a coupling degree of 5db and model RCP890A05 can be used for coupling.
  • the power divider 103 divides the first reference signal obtained by the coupling into two paths.
  • One way passes through the first attenuator 104, the first phase shifting network 105, and then inputs the four-way phase detecting module 112, which is inside the four-way phase detecting module. After the first 0.
  • Phase shifter 203 first 90.
  • Phase shifter 206 second zero. Phase shifter
  • phase shifter 201 the first 180. Phase shifter 204, third zero.
  • phase shifter 207 second 180 ⁇ phase shifter 209, phase shifts by 0, respectively. 90. , 180, 270.
  • the signal is used as a reference signal for four-phase phase detection.
  • the other way (the second branch of the first reference signal, ie the second first reference signal) passes through the second attenuator 108 and the second phase shifting network 111, and then inputs the four-way multiplier module 115 as a four-way multiplication Reference signal of the device.
  • the leakage signal in the reverse received signal is input to the combiner, and after combining with the cancellation signal, the four-phase phase detection module is input.
  • the input four-phase phase detection module performs detection processing as a leakage signal in the reverse reception signal.
  • the phase is ⁇ phase
  • U dl ⁇ A d cos(iMf + ⁇ ) 5
  • U d2 K,A d cos(iMf + ⁇ -90°) 5
  • U d3 K,A d cos(i9f + ⁇ -180°) 5
  • U d4 K, A d C0S (irt + A- 270.).
  • the four phase-shifted reference signals respectively input four phase detectors as reference signals of the phase detector.
  • VVOOCCMM VVOOCCMM-- UU xxll
  • the VVOOCCMM mentioned above has an active source difference
  • the reference of the differential filter filter is referenced to the voltage value of the voltage.
  • the four-four-way road has the output signal signal of the source-difference differential filter filter. After passing through the four-four-way analog-mode analog product, the amplitude and error error automatically After the parameter number of the accumulative accumulator is 11 and CC, the anti-reverse product integral transfer operation is calculated, and then the output signal signal is changed to:
  • the four signals output from the accumulator are input to the in-phase differential input and the quadrature differential input of the multiplier, respectively. Multiplying the four reference signals that have undergone orthogonal phase shifting by a multiplier to obtain a radio frequency signal.
  • the above multiplication is realized by a multiplier and a combiner.
  • This output signal U will be.
  • the input gain is G
  • the phase shift is the RF signal amplifier
  • the attenuation is L in the entire loop due to factors such as traces
  • the phase shift is the last output of the cancellation signal.
  • the number is:
  • the new leakage signal U P1 (A P -A) cos + generated after the combination is compared with the original leakage signal U p , in amplitude Will be 'j, some, but the phase is still the same as the original leakage signal.
  • the new leakage signal U P1 after inputting the four-channel phase detector the polarity of the detected in-phase signal and quadrature signal are not Will change.
  • U m (A- A p ) cos(a + réelle+ ⁇ 80°)
  • U P1 (A P - A) cos ( ⁇ + ⁇ ⁇ ) , H +180.
  • the amplitude A of the cancellation signal can be automatically adjusted, so that the cancellation signal amplitude and the leakage signal amplitude reach a dynamic balance. And when the amplitude and frequency of the leakage signal change, the cancellation signal can also change accordingly, and the amplitude of the cancellation signal and the leakage signal are kept equal, and the phase difference is 180.
  • the technical solution of the present invention generates an analog negative feedback loop to generate the same amplitude as the leakage signal with a phase difference of 180. The cancellation signal, to eliminate most of the energy of the leakage signal.
  • the adaptive adjustment of the cancellation device can achieve the cancellation balance state of the cancellation signal and the leakage signal with the same amplitude and phase difference of 180 in a short time, for example, such as Lock in less than 1.5ms.
  • the leakage signals measured before and after the combiner such as the Wilkinson combiner 113 are + 18dbm and -23dbm, respectively, that is, the leakage signal is cancelled by 40db.
  • the effect is very good, and the power value after cancellation is better than the previous period. Looking at -10dbm.
  • the measured loop can be locked in about 1.1ms, which is better than the expected 1.5ms, which means the system can be completely seamless.
  • the self-locking of the loop is completed within the charging time specified by the ten regulations, and no prior calibration or calculation operations are required at all.
  • the IQ demodulator included in the RFID system can be used to implement the function of four-way phase detection without additional devices.
  • the active filter can use two differential op amps to form two sets of two-stage active filter circuits in the form of MFB.
  • the filter passband bandwidth is about ⁇ .
  • the integrator that is, the four-channel amplitude error automatic accumulator can be used to form a four-channel integrating circuit by using a quad operational amplifier plus an external resistor and capacitor.
  • the output signal of the four-way multiplier 4 bar four-channel amplitude error automatic accumulator is used as a control signal for converting the control signals on the two coordinate axes of the in-phase baseband signal and the orthogonal baseband signal into radio frequency cancellation signals.
  • the RF amplifier uses the RF amplification module of model AH1 to amplify the cancellation signal amplitude generated by the modulator to increase the dynamic range of the circuit, and ensure that the circuit can work normally when the leakage signal power is large.
  • the Wilkinson combiner/power splitter is built with inductors, capacitors and resistor discrete components that work at both 800M and 900M.
  • Embodiments of the present invention provide a leakage cancellation technique implemented by using an analog circuit, by constructing an analog negative feedback loop to generate a cancellation signal having the same amplitude as the leakage signal and 180 degrees out of phase, and eliminating the leakage signal. Most of the energy.
  • this technology is characterized by full implementation of analog devices, compact structure, large dynamic range, fast locking time, and occurs at the frequency or amplitude of the leakage signal. When changing, the circuit can automatically lock and automatically follow the new operating frequency and amplitude in less than 1.5ms.
  • the compact analog adaptive RF leakage cancellation technique of the embodiment of the present invention improves the sensitivity of the passive RFID reader by suppressing the leakage signal of the RF carrier.
  • the advantage of the embodiment of the present invention is that it can be realized by all the analog circuits, the structure is compact, the design is ingenious, the dynamic range is large, the locking time is fast, and the adaptive adjustment can be realized when the frequency point, the antenna standing wave and other factors change.
  • Embodiments of the present invention also provide a radio frequency identification reader including the apparatus for implementing radio frequency leakage cancellation according to the above embodiments.
  • the embodiment of the invention further provides a method for implementing radio frequency leakage cancellation, which is used for canceling a leakage signal leaking to a reverse receiving channel in a forward radio frequency signal transmitted by a radio frequency identification reader, and is characterized in that it comprises The following steps are performed on the RF leakage cancellation device: Step 401: Coupling a first reference signal from a forward radio frequency signal transmitted by the radio frequency identification reader. Step 402: generating a cancellation signal according to the first reference signal. Step 403: performing cancellation processing on the leakage signal by using the cancellation signal The amplitude of the leakage signal after processing by the combiner is smaller than the amplitude of the original leakage signal.
  • step 402 includes: step 4021, the first treatment phase shifted reference signal, the reference signal is phase shifted to obtain four, four shift head shifted reference signals other mesh points is 1 J 0. 90. 180. , and 270.
  • the four-channel reference signal is used as a reference signal, and the input leakage signal is projected into four baseband signals.
  • the four baseband signals include: two differential in-phase signals and two differential orthogonal signals; Step 4022, The four baseband signals are respectively integrated; in step 4023, the first reference signal is phase-shifted to obtain a four-way phase-shift reference signal, and the four-way shift reference signal is shifted to another 1 J. 90. 180. , and 270.
  • the four-way moving reference signal is used as a reference signal, and the four integrated signals output by the four analog integrating modules are modulated to obtain a radio frequency cancellation signal for canceling the leakage signal, and the phase and leakage signal of the radio frequency cancellation signal.
  • the opposite phase Preferably, the method of the embodiment of the present invention, after step 403, further includes: using the combined signal as a new leakage signal, proceeding to step 402, and repeating steps 402 to 403 until the radio frequency cancellation signal and the leakage signal Complete cancellation, at this point, the cancellation circuit reaches the locked state.
  • the method of the embodiment of the present invention projects a radio frequency leakage signal to a baseband plane to obtain a baseband signal to extract phase and amplitude information of the leakage signal; and filters, amplifies, and integrates the projected baseband signal to obtain four-way control. Signal; then the obtained four-way control signal is input to the four-way multiplier to obtain a cancellation signal, and the cancellation signal and the leakage signal are combined.
  • the amplitude of the cancellation signal can be automatically adjusted, so that the cancellation signal amplitude and the leakage signal amplitude reach a dynamic balance.

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Abstract

L'invention concerne un dispositif et un procédé pour permettre une annulation de fuite de fréquence radio et un lecteur d'identification par fréquence radio (RFID). Ledit dispositif comprend : un coupleur pour le couplage destiné à acquérir un premier signal de référence à partir du signal anticipé de fréquence radio transmis par le lecteur RFID; un circuit de génération de signal d'annulation pour générer un signal d'annulation selon ledit premier signal de référence; et un combineur pour réaliser l'annulation du signal de fuite à l'aide du signal d'annulation, l'amplitude du signal de fuite qui est traité par l'annulation étant inférieure à l'amplitude du signal de fuite d'origine. L'invention permet l'annulation du signal de fuite dans le signal anticipé de fréquence radio transmis par le lecteur RFID, qui fuit sur un canal de réception inverse.
PCT/CN2010/080033 2010-09-15 2010-12-20 Dispositif et procédé pour permettre une annulation de fuite de fréquence radio et lecteur d'identification par fréquence radio (rfid) WO2012034335A1 (fr)

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CN201010283448.0A CN101951241B (zh) 2010-09-15 2010-09-15 实现射频泄漏对消的装置及方法和射频识别阅读器
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US9960803B2 (en) * 2014-10-27 2018-05-01 Maxim Integrated Products, Inc. MIMO antenna leakage canceller system
CN105681722A (zh) * 2014-11-21 2016-06-15 北京计算机技术及应用研究所 一种视频电磁泄漏信号防护系统及其方法
CN105824014A (zh) * 2016-03-23 2016-08-03 电子科技大学 步进频率雷达的信号对消电路及步进频率雷达
CN106230472B (zh) * 2016-08-03 2018-05-01 江苏本能科技有限公司 射频载波对消处理方法及装置
CN107657297A (zh) * 2017-11-01 2018-02-02 湖南微步电子科技有限公司 用于无源超高频rfid读写器的载波对消电路与方法
CN108169697B (zh) * 2017-11-15 2020-08-18 深圳市君威科技有限公司 一种基于rf-squid应用的高稳定频率自动控制器
CN108282171B (zh) * 2017-12-22 2020-06-16 深圳市金溢科技股份有限公司 一种自干扰抵消装置及电子车牌读写器
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