Millimeter wave secondary down-conversion module

Abstract

The utility model discloses a millimeter wave secondary down-conversion module, which relates to the technical field of microwave electronics, adopts a double-balanced mixer to integrate frequency conversion, filtering amplification and power division monitoring functions in the module, and compared with the traditional scheme, the millimeter wave secondary down-conversion module has the advantages that the volume is greatly reduced, and the cost is reduced. The shunt signals of the power divider are subjected to frequency conversion dynamic adaptation and intelligent AGC closed-loop control through the detection module, so that the technical bottlenecks of the traditional down-conversion module in volume, frequency band stiffness and reliability are overcome, and meanwhile, the rapid deployment capability of one module and multiple scenes is realized; and a high-performance and low-cost millimeter wave receiving solution is provided for 6G communication, a low-orbit satellite terminal and an intelligent radar system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the microwave electron technical field, especially related to a millimeter wave secondary down conversion module. BACKGROUND

[0002] In high-frequency electronic systems such as satellite communication, radar detection and electronic countermeasure, the millimeter wave down conversion module as the hub of the signal receiving link undertakes the core function of converting high-frequency radio frequency signals into medium-low frequency signals. The existing secondary down conversion scheme is mostly customized for specific applications, and the local oscillator source tuning range, filter passband and mixer port characteristics are fixed, lacking dynamic frequency band reconstruction capability. And the traditional secondary down conversion module generally relies on mechanical attenuators or discrete PIN diode arrays, which has slow response speed, low attenuation accuracy, and is easy to cause instantaneous distortion or power overshoot in dynamic signal scenarios. UTILITY MODEL CONTENTS

[0003] In view of the defects in the prior art, the utility model provides a millimeter wave secondary down conversion module to solve the above technical problems.

[0004] A millimeter wave secondary down conversion module, comprising a signal source,

[0005] Further comprising a first attenuation amplification processing module, a first local oscillator source, a double balanced mixer, a first filter amplification module, a power divider, a detection module, a coupling output module,

[0006] The signal source is connected with the input end of the attenuation amplification module, the output end of the first attenuation amplification module is connected with the radio frequency port of the double balanced mixer, the first local oscillator source is connected with the local oscillator port of the double balanced mixer, the intermediate frequency port of the double balanced mixer is connected with the input end of the first amplification filter module, the output end of the first amplification filter module is connected with the common end of the power divider, one branch end of the power divider is connected with the detection module, the other branch end of the power divider is connected with the coupling output module;

[0007] The coupling output module comprises a third radio frequency amplifier, a fourth low pass filter, a coupler and a monitoring circuit, one branch end of the power divider is connected with the input end of the radio frequency amplifier, the output end of the third radio frequency amplifier is connected with the input end of the fourth low pass filter, the output end of the fourth low pass filter is connected with the input end of the coupler, the output end of the coupler is used for outputting intermediate frequency signals, and the coupling end of the coupler is connected with the monitoring circuit.

[0008] As preferably, the detection module comprises a third fixed attenuator, a fifth low pass filter, a demodulation logarithmic amplifier, an AD sampling circuit and an FPGA circuit, another branch end of the power divider is connected with the input end of the third fixed attenuator, the output end of the third fixed attenuator is connected with the input end of the fifth low pass filter, the output end of the fifth low pass filter is connected with the input end of the demodulation logarithmic amplifier, the output end of the demodulation logarithmic amplifier is connected with the input end of the AD sampling circuit, and the output end of the AD sampling circuit is connected with the input end of the FPGA circuit.

[0009] As preferably, the detection module comprises a third fixed attenuator, a fifth low pass filter, a demodulation logarithmic amplifier, an AD sampling circuit and an FPGA circuit, another branch end of the power divider is connected with the input end of the third fixed attenuator, the output end of the third fixed attenuator is connected with the input end of the fifth low pass filter, the output end of the fifth low pass filter is connected with the input end of the demodulation logarithmic amplifier, the output end of the demodulation logarithmic amplifier is connected with the input end of the AD sampling circuit, and the output end of the AD sampling circuit is connected with the input end of the FPGA circuit.

[0010] As preferably, the detection module comprises a third fixed attenuator, a fifth low pass filter, a demodulation logarithmic amplifier, an AD sampling circuit and an FPGA circuit, another branch end of the power divider is connected with the input end of the third fixed attenuator, the output end of the third fixed attenuator is connected with the input end of the fifth low pass filter, the output end of the fifth low pass filter is connected with the input end of the demodulation logarithmic amplifier, the output end of the demodulation logarithmic amplifier is connected with the input end of the AD sampling circuit, and the output end of the AD sampling circuit is connected with the input end of the FPGA circuit.

[0011] As preferably, the detection module comprises a third fixed attenuator, a fifth low pass filter, a demodulation logarithmic amplifier, an AD sampling circuit and an FPGA circuit, another branch end of the power divider is connected with the input end of the third fixed attenuator, the output end of the third fixed attenuator is connected with the input end of the fifth low pass filter, the output end of the fifth low pass filter is connected with the input end of the demodulation logarithmic amplifier, the output end of the demodulation logarithmic amplifier is connected with the input end of the AD sampling circuit, and the output end of the AD sampling circuit is connected with the input end of the FPGA circuit.

[0012] As preferably, the first attenuation amplification processing module comprises an equalizer, a second digital controlled attenuator, a third power amplifier and a first temperature compensation attenuator, the output end of the fourth switcher is connected with the input end of the equalizer, the output end of the equalizer is connected with the input end of the second digital controlled attenuator, the output end of the second digital controlled attenuator is connected with the input end of the third power amplifier, the output end of the third power amplifier is connected with the first temperature compensation attenuator, and the output end of the first temperature compensation attenuator is connected with the radio frequency port of the double balanced mixer.

[0013] As preferably, a second attenuation amplification processing module is further included, which comprises a first fixed attenuator, a band pass filter, a fourth power amplifier, a second low pass filter and a second fixed attenuator, the intermediate frequency port of the double balanced mixer is connected with the input end of the first fixed attenuator, the output end of the first fixed attenuator is connected with the input end of the band pass filter, the output end of the band pass filter is connected with the input end of the fourth power amplifier, the output end of the fourth power amplifier is connected with the input end of the second low pass filter, the output end of the second low pass filter is connected with the input end of the second fixed attenuator, and the output end of the second fixed attenuator is connected with the common end of the power divider.

[0014] As preferably, a second local oscillator source and a radio frequency mixer are further included, the second local oscillator source is connected with the local oscillator port of the radio frequency mixer, the second fixed attenuator is connected with the radio frequency port of the radio frequency mixer, and the intermediate frequency port of the radio frequency mixer is connected with the common end of the power divider.

[0015] As preferably, a third attenuation amplification processing module is further included, which comprises a second temperature compensation attenuator, a first radio frequency amplifier, a third digital controlled attenuator and a second radio frequency amplifier, the intermediate frequency port of the radio frequency mixer is connected with the input end of the second temperature compensation attenuator, the output end of the second temperature compensation attenuator is connected with the input end of the first radio frequency amplifier, the output end of the first radio frequency amplifier is connected with the input end of the third digital controlled attenuator, and the output end of the third digital controlled attenuator is connected with the input end of the second radio frequency amplifier.

[0016] As preferably, the third attenuation amplification module further comprises a third low pass filter, the output end of the second temperature compensation attenuator is connected with the input end of the third low pass filter, and the output end of the third low pass filter is connected with the input end of the first radio frequency amplifier.

[0017] The utility model discloses beneficial effect is: the scheme adopts double balanced frequency mixer and integrates frequency conversion, filter amplification and power division monitoring function in the module, compared with traditional scheme, the volume is greatly reduced, and the power divider branch signal realizes through frequency conversion dynamic adaptation and intelligent AGC closed loop control through the detection module, the technical bottleneck of traditional down conversion module in volume, frequency band rigidity and reliability is conquered, and the quick deployment ability of " one module multiple scenes " is realized, provides high performance, low cost millimeter wave receiving solution for 6G communication, low orbit satellite terminal and intelligent radar system. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiment of the present application or prior art, the drawings needed in the embodiment or prior art description will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0019] Figure 1 The utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides;

[0020] Figure 2 The utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides;

[0021] Figure 3 The utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides;

[0022] Figure 4 The utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides;

[0023] Figure 5 The utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides;

[0024] Figure 6 The utility model provides a kind of millimeter wave secondary down conversion module structure schematic diagram for the utility model provides. DETAILED DESCRIPTION

[0025] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model.

[0027] The embodiments of the utility model are described in detail below in combination with the drawings.

[0028] As Figure 1 shown, a millimeter wave secondary down-conversion module, comprising a signal source,

[0029] Further comprising a first attenuation amplification processing module, a first local oscillator source, a double balanced mixer, a first filter amplification module, a power divider, a detection module, a coupling output module,

[0030] The signal source is connected with the input end of the attenuation amplification module, the output end of the first attenuation amplification module is connected with the radio frequency port of the double balanced mixer, the first local oscillator source is connected with the local oscillator port of the double balanced mixer, the intermediate frequency port of the double balanced mixer is connected with the input end of the first filter amplification module, the output end of the first filter amplification module is connected with the common end of the power divider, one branch end of the power divider is connected with the detection module, the other branch end of the power divider is connected with the coupling output module;

[0031] The coupling output module comprises a third radio frequency amplifier, a fourth low pass filter, a coupler and a monitoring circuit, one branch end of the power divider is connected with the input end of the radio frequency amplifier, the output end of the third radio frequency amplifier is connected with the input end of the fourth low pass filter, the output end of the fourth low pass filter is connected with the input end of the coupler, the output end of the coupler is used for outputting intermediate frequency signals, and the coupling end of the coupler is connected with the monitoring circuit.

[0032] The signal input at the signal source is subjected to switch attenuation amplification processing, and after being subjected to first mixing with the local oscillator signal input at the first local oscillator source, a mixed signal is generated. The mixed signal is subjected to a series of processing such as filtering and amplification by the first filtering and amplification module to generate an output signal. Part of the output signal is adjusted to a set frequency by configuring a radio frequency center, and then covers the instantaneous 2G instantaneous bandwidth. The part of the signal is then sent to the detection module for detection by a power divider. The signal detected is output as a receiving indication for monitoring. Another part of the output signal is sent to the coupling output module. The output end of the coupler outputs an intermediate frequency signal, and the coupling end outputs an intermediate frequency monitoring signal.

[0033] The present scheme integrates the functions of frequency conversion, filtering and amplification, and power division monitoring in the module by using a double balanced mixer. Compared with the traditional scheme, the volume is greatly reduced. The power divider branch signal is subjected to frequency conversion dynamic adaptation and intelligent AGC closed loop control through the detection module. The technical bottleneck of the traditional down conversion module in volume, frequency band rigidity and reliability is overcome. At the same time, the rapid deployment capability of "one module, multiple scenes" is realized. A high-performance, low-cost millimeter wave receiving solution is provided for 6G communication, low-orbit satellite terminal and intelligent radar system.

[0034] In the specific implementation process, the signal source is used to input 18-40G signals, and the first local oscillator source is used to input 21.6-40.8G local oscillator signals.

[0035] More specifically, the detection module includes a third fixed attenuator, a fifth low-pass filter, a demodulation logarithmic amplifier, an AD sampling circuit and an FPGA circuit. Another branch end of the power divider is connected to the input end of the third fixed attenuator. The output end of the third fixed attenuator is connected to the input end of the fifth low-pass filter. The output end of the fifth low-pass filter is connected to the input end of the demodulation logarithmic amplifier. The output end of the demodulation logarithmic amplifier is connected to the input end of the AD sampling circuit. The output end of the AD sampling circuit is connected to the input end of the FPGA circuit.

[0036] The third fixed attenuator is used to pre-inhibit the overstrong signal of the power divider branch to prevent the demodulation logarithmic amplifier from being saturated. The demodulation logarithmic amplifier is used to convert the input signal into a logarithmic linear voltage, which is suitable for weak signal reception and strong interference scenes. The AD sampling circuit is used to digitize the analog signal. The AD sampling data is sent to the control board FPGA to realize the AGC function. The real-time digital filtering and calibration algorithm of the FPGA circuit can meet the strict power tolerance requirements of high-order modulation systems such as 1024QAM, and provides a high-reliability, real-time power monitoring and AGC solution for the millimeter wave secondary down conversion system.

[0037] In the implementation process, the AGC circuit uses 4 cycle time to read the AD data, and then processes the data to calculate the down-conversion channel attenuation data, and then configures the down-conversion gain through the attenuation data, so as to realize the down-conversion automatic gain control (AGC). The FPGA operation clock is 80MHz, and the cycle is 12.5ns. It takes about 8 clock cycle time from the detection AD data update to the AGC adjustment. Therefore, the detection module can adapt to the minimum pulse width of 100ns for the AGC mode of the received pulse signal, and the pulse width signal below 100ns needs to be configured to the MGC to realize the down-conversion channel gain adjustment.

[0038] As shown in Figure 2 More specifically, it further comprises a radio frequency self-checking switching module, which comprises a limiter, a first switch, a first digital controlled attenuator, a first power amplifier and a second switch. The signal source is connected with the input end of the limiter. The output end of the limiter is connected with the fixed end of the first switch. One movable end of the first switch is connected with the input end of the first digital controlled attenuator. The other movable end of the first switch is connected with the first power amplifier. The output end of the first digital controlled attenuator is connected with one movable end of the second switch. The output end of the first power amplifier is connected with the other movable end of the second switch. The fixed end of the second switch is connected with the radio frequency port of the double balanced mixer.

[0039] Through the cooperative switching of the first switch and the second switch, the internal self-checking signal can be injected into the mixer radio frequency port without interrupting the normal signal link, so as to realize the real-time link performance monitoring of, for example, gain drift, local oscillator leakage, etc. The limiter is used to suppress the burst peak value of the external input or self-checking signal, so as to avoid damaging the sensitive devices such as the mixer and the amplifier. Combined with the real-time power data of the FPGA feedback control or the detection module, the attenuation or amplification path is dynamically selected, and the attenuation value / gain value is accurately configured, so that the system can still maintain the optimal signal-to-noise ratio in a complex electromagnetic environment.

[0040] As shown in Figure 3 More specifically, it further comprises a filter processing module, which comprises a third switch, a first low-pass filter, a high-pass filter and a fourth switch. The fixed end of the second switch is connected with the fixed end of the third switch. One movable end of the third switch is connected with the input end of the first low-pass filter. The other movable end of the third switch is connected with the input end of the high-pass filter. The output end of the first low-pass filter is connected with one movable end of the fourth switch. The output end of the high-pass filter is connected with the other movable end of the fourth switch. The fixed end of the fourth switch is connected with the radio frequency port of the double balanced mixer.

[0041] Through the cooperation of the third switch and the fourth switch, dynamic selection can be realized between the low-pass filter and the high-pass filter to achieve full-band seamless coverage. When switched to the low-pass mode, it is used to suppress high-frequency noise and is suitable for satellite Ka band signal processing of 26.5~40GHz; when switched to the high-pass mode, it is used to filter out low-frequency interference and can improve the sensitivity of radar Ku band signals of 18~26.5GHz. Through switch selection, the best filtering path is selected to compensate for the gain fluctuation at the edge of the frequency band, which can effectively improve the gain flatness of the full frequency band.

[0042] More specifically, it further includes a second power amplifier, the fixed end of the second switch is connected with the input end of the second power amplifier, and the output end of the second power amplifier is connected with the fixed end of the third switch.

[0043] The second power amplifier is at the front end of the filtering processing module, which is used to pre-amplify the radio frequency signal output by the second switch, compensate for the insertion loss of the subsequent low-pass / high-pass filter, and ensure the full-link gain flatness.

[0044] As shown in Figure 4 More specifically, the first attenuation amplification processing module includes an equalizer, a second digital attenuator, a third power amplifier, and a first temperature compensation attenuator. The output end of the fourth switch is connected with the input end of the equalizer, the output end of the equalizer is connected with the input end of the second digital attenuator, the output end of the second digital attenuator is connected with the input end of the third power amplifier, the output end of the third power amplifier is connected with the first temperature compensation attenuator, and the output end of the first temperature compensation attenuator is connected with the radio frequency port of the double balanced mixer.

[0045] The attenuation amplification processing module adopts the cooperation of the equalizer and the temperature compensation attenuator through multi-stage compensation design, optimizes the system gain flatness, and relieves the group delay fluctuation. The second digital attenuator and the third power amplifier form a closed-loop system, which can realize automatic gain control through FPGA control, has fast response time, and high power control precision.

[0046] As shown in Figure 5As shown, more specifically, it further includes a second attenuation amplification processing module, which includes a first fixed attenuator, a band-pass filter, a fourth power amplifier, a second low-pass filter and a second fixed attenuator, the intermediate frequency port of the double balanced mixer is connected with the input end of the first fixed attenuator, the output end of the first fixed attenuator is connected with the input end of the band-pass filter, the output end of the band-pass filter is connected with the input end of the fourth power amplifier, the output end of the fourth power amplifier is connected with the input end of the second low-pass filter, the output end of the second low-pass filter is connected with the input end of the second fixed attenuator, and the output end of the second fixed attenuator is connected with the common end of the power divider.

[0047] The first fixed attenuator cooperates with the band-pass filter to support 18-40GHz ultra-wide frequency band signal processing, ensures the effect of optimizing signal frequency response flatness, the fourth power amplifier combines the second low-pass filter to realize dynamic range expansion, can support various signal intensity scenes, can effectively improve the dynamic range, and the double-filter design of the band-pass filter and the low-pass filter combined with the high linearity of the power amplifier can ensure low distortion of signal transmission. The front band-pass filter is used to prevent image interference, and the rear low-pass filter is used to remove high-order harmonics.

[0048] More specifically, it further includes a second local oscillator and a radio frequency mixer, the second local oscillator is connected with the local oscillator port of the radio frequency mixer, the second fixed attenuator is connected with the radio frequency port of the radio frequency mixer, and the intermediate frequency port of the radio frequency mixer is connected with the common end of the power divider.

[0049] The second local oscillator cooperates with the radio frequency mixer to ensure the accuracy of signal frequency conversion, through the above optimization design, the local oscillator phase noise can be effectively optimized, the stability and accuracy of signal processing can be enhanced, various signal intensity scenes can be covered, and stable transmission of signals in the distribution process can be ensured.

[0050] As shown, Figure 6 More specifically, it further includes a third attenuation amplification processing module, which includes a second temperature compensation attenuator, a first radio frequency amplifier, a third digital control attenuator and a second radio frequency amplifier, the intermediate frequency port of the radio frequency mixer is connected with the input end of the second temperature compensation attenuator, the output end of the second temperature compensation attenuator is connected with the input end of the first radio frequency amplifier, the output end of the first radio frequency amplifier is connected with the input end of the third digital control attenuator, and the output end of the third digital control attenuator is connected with the input end of the second radio frequency amplifier.

[0051] The second temperature compensation attenuator cooperates with the first radio frequency amplifier to ensure stability and consistency of signal transmission, effectively improves overall dynamic range effect of the module, and meanwhile, the third digital control attenuator cooperates with the second radio frequency amplifier to realize accurate signal power regulation, has shorter response time, supports multi-scene adaptive adjustment, and has higher power control precision.

[0052] More specifically, the third attenuating and amplifying module further comprises a third low-pass filter, an output end of the second temperature compensation attenuator is connected with an input end of the third low-pass filter, and an output end of the third low-pass filter is connected with an input end of the first radio frequency amplifier.

[0053] The third low-pass filter cooperates with the first radio frequency amplifier to ensure that frequency response of the signal in the transmission process is better optimized in flatness, reduces group delay fluctuation, and the second temperature compensation attenuator cooperates with the third low-pass filter to realize wider dynamic range expansion and support multiple signal intensity scenes, thereby ensuring sensitivity and linearity of signal transmission.

[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, rather than limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should be covered in the scope of the claims and the specification of the utility model.

Claims

1. A millimeter-wave double downconversion module, comprising a signal source, characterized in that: It also includes a first attenuation and amplification processing module, a first local oscillator, a double-balanced mixer, a first filtering and amplification module, a power divider, a detector module, and a coupling output module. The signal source is connected to the input terminal of the first attenuation amplification processing module, the output terminal of the first attenuation amplification processing module is connected to the RF port of the double-balanced mixer, the first local oscillator source is connected to the local oscillator port of the double-balanced mixer, the intermediate frequency port of the double-balanced mixer is connected to the input terminal of the first filter amplification module, the output terminal of the first filter amplification module is connected to the common terminal of the power divider, one branch terminal of the power divider is connected to the detector module, and the other branch terminal of the power divider is connected to the coupling output module. The coupling output module includes a third RF amplifier, a fourth low-pass filter, a coupler, and a monitoring circuit. One branch terminal of the power divider is connected to the input terminal of the RF amplifier. The output terminal of the third RF amplifier is connected to the input terminal of the fourth low-pass filter. The output terminal of the fourth low-pass filter is connected to the input terminal of the coupler. The output terminal of the coupler is used to output an intermediate frequency signal. The coupling terminal of the coupler is connected to the monitoring circuit.

2. The millimeter-wave secondary down-conversion module according to claim 1, characterized in that, The detection module includes a third fixed attenuator, a fifth low-pass filter, a demodulation logarithmic amplifier, an AD sampling circuit, and an FPGA circuit. The other branch terminal of the power divider is connected to the input terminal of the third fixed attenuator. The output terminal of the third fixed attenuator is connected to the input terminal of the fifth low-pass filter. The output terminal of the fifth low-pass filter is connected to the input terminal of the demodulation logarithmic amplifier. The output terminal of the demodulation logarithmic amplifier is connected to the input terminal of the AD sampling circuit. The output terminal of the AD sampling circuit is connected to the input terminal of the FPGA circuit.

3. The millimeter-wave secondary down-conversion module according to claim 1, characterized in that, It also includes an RF self-test switching module, which includes a limiter, a first switch, a first digitally controlled attenuator, a first power amplifier, and a second switch. The signal source is connected to the input terminal of the limiter, the output terminal of the limiter is connected to the stationary terminal of the first switch, one moving terminal of the first switch is connected to the input terminal of the first digitally controlled attenuator, the other moving terminal of the first switch is connected to the first power amplifier, the output terminal of the first digitally controlled attenuator is connected to one moving terminal of the second switch, the output terminal of the first power amplifier is connected to the other moving terminal of the second switch, and the stationary terminal of the second switch is connected to the RF port of the double-balanced mixer.

4. The millimeter-wave secondary down-conversion module according to claim 3, characterized in that, It also includes a filtering module, which comprises a third switch, a first low-pass filter, a high-pass filter, and a fourth switch. The stationary terminal of the second switch is connected to the stationary terminal of the third switch. One moving terminal of the third switch is connected to the input terminal of the first low-pass filter, and the other moving terminal of the third switch is connected to the input terminal of the high-pass filter. The output terminal of the first low-pass filter is connected to one moving terminal of the fourth switch, and the output terminal of the high-pass filter is connected to the other moving terminal of the fourth switch. The stationary terminal of the fourth switch is connected to the RF port of the double-balanced mixer.

5. The millimeter-wave secondary down-conversion module according to claim 4, characterized in that, It also includes a second power amplifier, wherein the stationary terminal of the second switch is connected to the input terminal of the second power amplifier, and the output terminal of the second power amplifier is connected to the stationary terminal of the third switch.

6. The millimeter-wave secondary down-conversion module according to claim 4, characterized in that, The first attenuation amplification processing module includes an equalizer, a second digitally controlled attenuator, a third power amplifier, and a first temperature-compensated attenuator. The output terminal of the fourth switch is connected to the input terminal of the equalizer, the output terminal of the equalizer is connected to the input terminal of the second digitally controlled attenuator, the output terminal of the second digitally controlled attenuator is connected to the input terminal of the third power amplifier, the output terminal of the third power amplifier is connected to the first temperature-compensated attenuator, and the output terminal of the first temperature-compensated attenuator is connected to the RF port of the double-balanced mixer.

7. The millimeter-wave secondary down-conversion module according to claim 6, characterized in that, It also includes a second attenuation and amplification processing module, which includes a first fixed attenuator, a bandpass filter, a fourth power amplifier, a second low-pass filter, and a second fixed attenuator. The intermediate frequency port of the double-balanced mixer is connected to the input of the first fixed attenuator, the output of the first fixed attenuator is connected to the input of the bandpass filter, the output of the bandpass filter is connected to the input of the fourth power amplifier, the output of the fourth power amplifier is connected to the input of the second low-pass filter, the output of the second low-pass filter is connected to the input of the second fixed attenuator, and the output of the second fixed attenuator is connected to the common terminal of the power divider.

8. The millimeter-wave secondary down-conversion module according to claim 7, characterized in that, It also includes a second local oscillator and an RF mixer. The second local oscillator is connected to the local oscillator port of the RF mixer, the second fixed attenuator is connected to the RF port of the RF mixer, and the intermediate frequency port of the RF mixer is connected to the common terminal of the power divider.

9. The millimeter-wave secondary down-conversion module according to claim 8, characterized in that, It also includes a third attenuation amplification processing module, which includes a second temperature-compensated attenuator, a first radio frequency amplifier, a third digitally controlled attenuator, and a second radio frequency amplifier. The intermediate frequency port of the radio frequency mixer is connected to the input of the second temperature-compensated attenuator, the output of the second temperature-compensated attenuator is connected to the input of the first radio frequency amplifier, the output of the first radio frequency amplifier is connected to the input of the third digitally controlled attenuator, and the output of the third digitally controlled attenuator is connected to the input of the second radio frequency amplifier.

10. The millimeter-wave secondary down-conversion module according to claim 9, characterized in that, The third attenuation amplification processing module further includes a third low-pass filter. The output terminal of the second temperature-compensated attenuator is connected to the input terminal of the third low-pass filter, and the output terminal of the third low-pass filter is connected to the input terminal of the first radio frequency amplifier.

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