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CN-224218385-U - Radio frequency signal receiver module and wireless microwave gateway

CN224218385UCN 224218385 UCN224218385 UCN 224218385UCN-224218385-U

Abstract

The utility model discloses a radio frequency signal receiver module and a wireless microwave gateway, and belongs to the technical field of wireless monitoring. A radio frequency signal receiver module comprises a passive down-conversion mixer, a band-pass filter, a first low-pass filter and an analog-to-digital converter which are connected in sequence. The wireless microwave gateway comprises the radio frequency signal receiver module. The passive tag return signal receiver module eliminates the large direct current component generated by the leaked carrier wave after down-conversion through the cooperation of the passive down-conversion mixer and the band-pass filter, reduces the influence on the post-stage circuit of the receiver module, thereby improving the sensitivity of the receiver module, avoiding blocking and blocking the receiver module, and greatly improving the demodulation precision of the obtained intermediate frequency signal with high fidelity.

Inventors

  • YE XUN
  • GE HONGKAI
  • YAN YONGXIANG
  • DENG LINGLING
  • YU XINGCAI
  • Dong Zhehui
  • JI XUEWEN
  • WANG JING
  • ZHANG WEI
  • ZHOU XIAO
  • CHEN FANGZHENG
  • ZHOU DONGHUI
  • Cui Wanxiang
  • Wu Xiepeng
  • ZHANG HAO
  • FENG JINPENG

Assignees

  • 浙江浙能燃气股份有限公司

Dates

Publication Date
20260508
Application Date
20250416

Claims (10)

  1. 1. The radio frequency signal receiver module is characterized by comprising a passive down-conversion mixer (201), a band-pass filter (202), a first low-pass filter (203) and an analog-to-digital converter (204) which are sequentially connected, wherein the passive down-conversion mixer (201) is used for receiving a radio frequency signal returned by a passive tag and a leaked carrier signal and converting the radio frequency signal into an intermediate frequency signal, the passive down-conversion mixer (201) and the band-pass filter (202) are used for eliminating direct current components, the first low-pass filter (203) is used for enhancing attenuation of the radio frequency signal and harmonic components thereof, and the analog-to-digital converter (204) is used for converting the intermediate frequency signal into an intermediate frequency digital signal and outputting the intermediate frequency digital signal.
  2. 2. The radio frequency signal receiver module of claim 1, wherein the passive down-conversion mixer (201) comprises a coupler (2010), a first capacitor (2011), a second capacitor (2012), a first inductor (2013), a second inductor (2014), a first schottky diode (2015), a second schottky diode (2016), and a second low-pass filter (2017); the port one P1 of the coupler (2010) is used for receiving a radio frequency signal returned by a passive tag and a leaked carrier signal, and the port two P2 of the coupler (2010) is connected with a local oscillator source; A first end and a second end of the first capacitor (2011) are respectively connected with the coupler (2010) and a first end of the first inductor (2013), and a second end of the first inductor (2013) is grounded; -a first end and a second end of the second capacitor (2012) are connected to a first end of the coupler (2010) and the second inductor (2014), respectively, a second end of the second inductor (2014) being grounded; -a first end and a second end of the first schottky diode (2015) are connected to a first end of the first inductor (2013) and an input port of the second low-pass filter (2017), respectively, and a first end and a second end of the second schottky diode (2016) are connected to a first end of a second inductor (2014) and an input port of the second low-pass filter (2017), respectively; an output port P3 of the second low-pass filter (2017) is connected to the band-pass filter (202).
  3. 3. The radio frequency signal receiver module of claim 2, wherein the band pass filter (202) is a capacitively coupled LC resonant circuit.
  4. 4. A radio frequency signal receiver module according to claim 3, characterized in that the band pass filter (202) comprises a port four P4, a first LC resonance circuit, a fifth capacitor (2020), a second LC resonance circuit and a port five P5 connected in sequence, the port four P4 being connected to the output port P3 and the port five P5 being connected to the analog to digital converter (204).
  5. 5. The radio frequency signal receiver module according to claim 4, wherein the first LC resonant circuit comprises a third inductance (2021) and a third capacitance (2023) both grounded, the third inductance (2021) being connected to the port four P4, the third capacitance (2023) being connected to first ends of the third inductance (2021) and the fifth capacitance (2020); The second LC resonant circuit comprises a fourth inductor (2022) and a fourth capacitor (2024) which are grounded, the fourth inductor (2022) is connected with the port five P5, and the fourth capacitor (2024) is connected with the second ends of the fourth inductor (2022) and the fifth capacitor (2020).
  6. 6. The radio frequency signal receiver module according to claim 2, wherein the first low pass filter (203) is a second order RC low pass filter.
  7. 7. The radio frequency signal receiver module of claim 6, wherein the first low pass filter (203) comprises a first resistor (2031), a second resistor (2033), a sixth capacitor (2032), and a seventh capacitor (2034); the first end of the first resistor (2031) is connected with a port six P6, the port six P6 is connected with the band-pass filter (202), the second end of the first resistor (2031) is connected with the first end of the sixth capacitor (2032), the second end of the sixth capacitor (2032) is grounded, the first end of the second resistor (2033) is connected with a port seven P7, the port seven P7 is connected with the analog-to-digital converter (204), the first end of the second resistor (2033) is also connected with the first end of the seventh capacitor (2034), the second end of the seventh capacitor (2034) is grounded, and the second end of the second resistor (2033) is connected with the second end of the first resistor (2031).
  8. 8. The radio frequency signal receiver module according to claim 7, wherein the second low-pass filter (2017) is identical to the first low-pass filter (203) in structure, a port six P6 of the second low-pass filter (2017) is an input port of the second low-pass filter (2017), and a port seven P7 of the second low-pass filter (2017) is an output port of the second low-pass filter (2017).
  9. 9. A wireless microwave gateway is characterized by comprising a gateway antenna (501), a 5G gateway module (502), a baseband processing module (400), a transmitter module, a circulator (102) and a first antenna (101) which are sequentially connected, and a radio frequency signal receiver module according to any one of claims 1 to 8, wherein a passive down-conversion mixer (201) and an analog-to-digital converter (204) are respectively connected with the circulator (102) and the baseband processing module (400), the gateway antenna (501) is used for receiving a control instruction sent by a remote control platform, the baseband processing module (400) is used for generating baseband data after receiving the control instruction sent by the remote control platform, and is used for receiving an intermediate frequency digital signal and transmitting the analyzed data to the 5G gateway module 502, and the first antenna (101) is used for radiating a downlink signal to a free space and receiving a passive tag return signal.
  10. 10. The wireless microwave gateway according to claim 9, characterized in that the transmitter module comprises a digital-to-analog converter (303), a driver (302) and a power amplifier (301) connected in sequence, the digital-to-analog converter (303) being connected to the baseband processing module (400), the power amplifier (301) being connected to the circulator (102).

Description

Radio frequency signal receiver module and wireless microwave gateway Technical Field The utility model relates to the technical field of wireless monitoring, in particular to a radio frequency signal receiver module and a wireless microwave gateway. Background Ext> inext> theext> applicationext> ofext> theext> 5ext> Gext> -ext> Aext> passiveext> Internetext> ofext> thingsext>,ext> aext> passiveext> Internetext> ofext> thingsext> systemext> canext> beext> formedext> byext> utilizingext> theext> wirelessext> microwaveext> gatewayext> andext> theext> wirelessext> tagext>,ext> andext> theext> wirelessext> microwaveext> gatewayext> continuouslyext> transmitsext> wirelessext> carrierext> signalsext> toext> provideext> energyext> forext> theext> passiveext> tagext>.ext> However, the wireless microwave gateway includes a transmitter end and a receiver end, in the communication process, the carrier signal transmitted by the transmitter end of the wireless microwave gateway leaks to the receiver end, the downlink signal strength of the leaked carrier is far greater than the uplink signal strength of the passive tag, the leaked carrier can interfere the uplink signal of the passive tag, and the communication performance of the passive internet of things system is reduced, and specifically: Because the passive tag has no power supply, the internal circuit needs to rectify the continuous carrier wave generated by the transmitter of the wireless microwave gateway to provide the voltage for enabling the wireless microwave gateway to work normally, and meanwhile, the tag finishes the transmission of the return signal in a backscattering modulation mode, so that the transmitter always transmits a high-power carrier wave when receiving the tag return signal, for the passive microwave gateway with a single antenna, the isolation degree of a receiving and transmitting isolation device (such as a circulator and a directional coupler) cannot reach theoretical infinity, part of the transmitted radio-frequency carrier wave signal leaks to a receiving end, the leakage power is usually 0-10 dBm along with the changes of the isolation degree and the transmission power, and the power of the passive tag return signal is usually not higher than-50 dBm, so that the power of the leakage carrier wave signal is far higher than the power of the passive tag return signal, the leakage carrier wave can have negative influence on the sensitivity of the receiver, and even the receiver is likely to be blocked. In addition, the conventional receiver generally adopts a superheterodyne and zero intermediate frequency receiver architecture for the down-conversion processing of the tag return signal, and these receiver modules generally include a low noise amplifier, a radio frequency band-pass filter and a down-converter. Disclosure of utility model The utility model aims to provide a radio frequency signal receiver module and a wireless microwave gateway, which are used for solving the problems that when a receiver of the existing wireless microwave gateway receives a passive tag return signal, carrier leakage exists, so that the sensitivity of the receiver is negatively influenced and the receiver is possibly blocked. The technical scheme for solving the technical problems is as follows: The radio frequency signal receiver module comprises a passive down-conversion mixer, a band-pass filter, a first low-pass filter and an analog-to-digital converter which are connected in sequence, wherein the passive down-conversion mixer is used for receiving a radio frequency signal returned by a passive tag and a leaked carrier signal and converting the radio frequency signal into an intermediate frequency signal, the passive down-conversion mixer and the band-pass filter are used for eliminating direct current components, the first low-pass filter is used for enhancing attenuation of the radio frequency signal and harmonic components thereof, and the analog-to-digital converter is used for converting the intermediate frequency signal into an intermediate frequency digital signal and outputting the intermediate frequency digital signal. Further, the passive down-conversion mixer includes a coupler, a first capacitor, a second capacitor, a first inductor, a second inductor, a first schottky diode, a second schottky diode, and a second low-pass filter; The port one P1 of the coupler is used for receiving the radio frequency signal returned by the passive tag and the leaked carrier signal, and the port two P2 of the coupler is connected with the local oscillation source; The first end and the second end of the second capacitor are respectively connected with the first ends of the coupler and the second inductor, and the second end of the second inductor is grounded; The first end and the second end of the first Schottky diode are respectively connected with the first end of the first inductor and the input port of the second low-pass filter, and the first end and