阅读说明：本技术 太赫兹信号网络参数测试扩频装置 (Terahertz signal network parameter testing spread spectrum device ) 是由 贾定宏 王沫 邓建钦 朱伟峰 姜万顺 年夫顺 朱翔 刘跃 霍建东 曲志明 程笑林 于 2021-08-17 设计创作，主要内容包括：本发明涉及太赫兹信号网络参数测试扩频装置,包括分别与信号分离单元连接的信号发生单元和信号接收单元,信号分离单元设有测试端口,信号发生单元设有射频输入端口,信号接收单元包括参考信号接收单元和测试信号接收单元,参考信号接收单元和测试信号接收单元通过功率分离模块连接在一起,功率分离模块设有本振信号输入端口,参考信号接收单元设有参考中频输出端口,测试信号接收单元设有测试中频输出端口。信号发生和接收单元均采用了72次固态级联倍频/混频方法,微波矢量网络分析仪主机提供10.41GHz-15.28GHz的射频及本振输入信号,即可实现0.75THz～1.1THz全频段网络参数测试,兼容性高。(The invention relates to a terahertz signal network parameter testing spread spectrum device which comprises a signal generating unit and a signal receiving unit which are respectively connected with a signal separating unit, wherein the signal separating unit is provided with a testing port and a radio frequency input port, the signal receiving unit comprises a reference signal receiving unit and a testing signal receiving unit, the reference signal receiving unit and the testing signal receiving unit are connected together through a power separating module, the power separating module is provided with a local oscillation signal input port, the reference signal receiving unit is provided with a reference intermediate frequency output port, and the testing signal receiving unit is provided with a testing intermediate frequency output port. The signal generating and receiving units adopt a 72-time solid-state cascade frequency doubling/mixing method, a microwave vector network analyzer host provides 10.41GHz-15.28GHz radio frequency and local oscillator input signals, and therefore the 0.75THz-1.1THz full-band network parameter test can be achieved, and compatibility is high.)

1. Terahertz signal network parameter test spread spectrum device now, its characterized in that: the device comprises a signal generating unit and a signal receiving unit which are respectively connected with a signal separating unit, wherein the signal separating unit is provided with a test port, the signal generating unit is provided with a radio frequency input port, the signal receiving unit comprises a reference signal receiving unit and a test signal receiving unit, the reference signal receiving unit and the test signal receiving unit are connected together through a power separating module, the power separating module is provided with a local oscillation signal input port, the reference signal receiving unit is provided with a reference intermediate frequency output port, and the test signal receiving unit is provided with a test intermediate frequency output port;

the input signals of 10.41-15.28GHz frequency band are input through the radio frequency input port and the local oscillation input port, the signal generating unit generates the radio frequency signals of 750 plus 1100GHz frequency band, and parameter test of 750 plus 1100GHz frequency band is realized.

2. The terahertz signal network parameter testing spread spectrum device of claim 1, wherein: the signal generation unit comprises at least four groups of signal generation frequency multipliers and at least two groups of signal generation amplifiers which are connected in series, the output end of the first signal generation frequency multiplier is connected with the input end of the first signal generation amplifier, the output end of the first signal generation amplifier is connected with the input end of the second signal generation frequency multiplier, the output end of the second signal generation frequency multiplier is connected with the input end of the second signal generation amplifier, the output end of the second signal generation amplifier is connected with the input end of the third signal generation frequency multiplier, the output end of the third signal generation frequency multiplier is connected with the fourth signal generation frequency multiplier, and the fourth signal generation frequency multiplier sends out radio-frequency signals of a required frequency band.

3. The terahertz signal network parameter testing spread spectrum device of claim 2, wherein: the first signal generation frequency multiplier amplifies an input signal frequency band twice, the second signal generation frequency multiplier and the third signal generation frequency multiplier amplify an input signal three times, and the fourth signal generation frequency multiplier amplifies an input signal four times.

4. The terahertz signal network parameter testing spread spectrum device of claim 1, wherein: the microwave vector network analyzer is connected with the radio frequency input port and sends an input signal of a 10.41-15.28GHz frequency band to the first signal generation frequency multiplier through the radio frequency input port, and a signal of a 20.82-30.56GHz frequency band is obtained and sent to the first signal generation amplifier.

5. The terahertz signal network parameter testing spread spectrum device of claim 4, wherein: the first signal generation amplifier drives the second signal generation frequency multiplier, and the radio-frequency signal of the 62.46-91.68GHz frequency band is obtained through the second signal generation frequency multiplier and is sent to the second signal generation amplifier.

6. The terahertz signal network parameter testing spread spectrum device of claim 5, wherein: the second signal generation amplifier continuously drives the third signal generation frequency multiplier and the fourth signal generation frequency multiplier, the radio frequency signal of 187.5-275GHz band is obtained through the third signal generation frequency multiplier, and the radio frequency signal of 750-1100GHz band is obtained through the fourth signal generation frequency multiplier.

7. The terahertz signal network parameter testing spread spectrum device of claim 1, wherein: the signal receiving unit comprises at least three groups of signal receiving frequency multipliers connected in series and at least two groups of signal receiving amplifiers, the output end of the first signal receiving frequency multiplier is connected with the input end of the first signal receiving amplifier, the output end of the first signal receiving amplifier is connected with the input end of the second signal receiving frequency multiplier, the output end of the second signal receiving frequency multiplier is connected with the input end of the second signal receiving amplifier, the output end of the second signal receiving amplifier is connected with the input end of the third signal receiving frequency multiplier, the third signal receiving frequency multiplier sends a local oscillation signal, and the output end of the third signal receiving frequency multiplier is connected with the frequency mixer.

8. The terahertz signal network parameter testing spread spectrum device of claim 7, wherein: the first signal receiving frequency multiplier and the second signal receiving frequency multiplier amplify the frequency band of the input signals by two times, and the third signal receiving frequency multiplier amplifies the frequency band of the input signals by three times to obtain the required local oscillation signals.

9. The terahertz signal network parameter testing spread spectrum device of claim 7, wherein: the first signal receiving frequency multiplier receives local oscillation signals of 10.41-15.28GHz frequency band, the local oscillation signals of 20.83-30.56GHz frequency band are obtained through amplification of the first signal receiving frequency multiplier and the first signal receiving amplifier, and the local oscillation signals are sent to the second signal receiving frequency multiplier;

the second signal receiving frequency multiplier obtains a local oscillation signal of a 41.66-61.2GHz frequency band, sends the local oscillation signal to the second signal receiving amplifier and drives the third signal receiving frequency multiplier;

the third signal receiving frequency multiplier obtains a local oscillation driving signal of a 125-183.34GHz frequency band and sends the local oscillation driving signal to the frequency mixer.

10. The terahertz signal network parameter testing spread spectrum device of claim 9, wherein: the mixer receives the local oscillation signal and the radio frequency signal of the 750-plus-1100 GHz frequency band sent by the signal generating unit to form an intermediate frequency, and the intermediate frequency is respectively output from the reference intermediate frequency output port and the test intermediate frequency output port.

Technical Field

The invention relates to the field of terahertz signals, in particular to a terahertz signal network parameter testing spread spectrum device.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The terahertz radiation is electromagnetic radiation with a frequency range of 0.1-10 THz, wherein terahertz signals with the frequency range of 0.75THz-1.1THz are frequency ranges covered by standard waveguide WR1.0, and the terahertz radiation is mainly applied to radar scattering cross section scaling test, air-space-ground integrated communication, near-field microscopic imaging, substance spectral line analysis and the like of large warships and other equipment in potential application fields.

In the application research process, a network parameter test condition is often required to be established to test devices, chips, components, front-end components and the like in a required frequency band, and a hardware module for realizing the network parameter test also needs to have the functions of signal generation and reception in the required frequency band, wherein the signal generation function can also be used as a front-end transceiving component of an application system for material testing, imaging, radar scattering cross section scaling testing and the like.

Limited by the current semiconductor process level, no terahertz signal network parameter testing device with the frequency range of 0.75THz-1.1THz exists at present.

Disclosure of Invention

In order to solve the technical problems existing in the background technology, the invention provides a terahertz signal network parameter testing spread spectrum device, a microwave vector network analyzer is utilized to provide radio frequency and local oscillator input signals of 10.41GHz-15.28GHz frequency band, the radio frequency signals pass through a plurality of groups of frequency multipliers and amplifiers which are connected in series and undergo 72 secondary cascade frequency multiplication, finally, radio frequency signals of 750 plus material 1100GHz (0.75 THz-1.1 THz) frequency band are obtained to serve as a signal generating unit, and the local oscillator signals undergo 12 secondary cascade frequency multiplication and 6 times of harmonic frequency mixing to form intermediate frequency output with the 750 plus material 1100GHz frequency band so as to realize 0.75THz-1.1THz full frequency band network parameter testing.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a terahertz signal network parameter testing spread spectrum device, which comprises a signal generating unit and a signal receiving unit which are respectively connected with a signal separating unit, wherein the signal separating unit is provided with a testing port and a radio frequency input port, the signal receiving unit comprises a reference signal receiving unit and a testing signal receiving unit, the reference signal receiving unit and the testing signal receiving unit are connected together through a power separating module, the power separating module is provided with a local oscillator signal input port, the reference signal receiving unit is provided with a reference intermediate frequency output port, and the testing signal receiving unit is provided with a testing intermediate frequency output port;

the input signals of 10.41-15.28GHz frequency band are input through the radio frequency input port and the local oscillation input port, the signal generating unit generates the radio frequency signals of 750 plus 1100GHz frequency band, and parameter test of 750 plus 1100GHz frequency band is realized.

The signal generation unit comprises at least four groups of signal generation frequency multipliers and at least two groups of signal generation amplifiers which are connected in series, the output end of the first signal generation frequency multiplier is connected with the input end of the first signal generation amplifier, the output end of the first signal generation amplifier is connected with the input end of the second signal generation frequency multiplier, the output end of the second signal generation frequency multiplier is connected with the input end of the second signal generation amplifier, the output end of the second signal generation amplifier is connected with the input end of the third signal generation frequency multiplier, the output end of the third signal generation frequency multiplier is connected with the fourth signal generation frequency multiplier, and the fourth signal generation frequency multiplier sends out radio-frequency signals of a required frequency band.

The first signal generation frequency multiplier amplifies the frequency band of an input signal by two times, the second signal generation frequency multiplier and the third signal generation frequency multiplier amplify the input signal by three times, and the fourth signal generation frequency multiplier amplifies the input signal by four times.

The microwave vector network analyzer is connected with the radio frequency input port and sends an input signal of a 10.41-15.28GHz frequency band to the first signal generation frequency multiplier through the radio frequency input port, and a signal of a 20.82-30.56GHz frequency band is obtained and sent to the first signal generation amplifier.

The first signal generation amplifier drives the second signal generation frequency multiplier, and the radio frequency signal of the 62.46-91.68GHz frequency band is obtained through the second signal generation frequency multiplier and is sent to the second signal generation amplifier.

The second signal generation amplifier continuously drives the third signal generation frequency multiplier and the fourth signal generation frequency multiplier, the radio frequency signal of 187.5-275GHz band is obtained through the third signal generation frequency multiplier, and the radio frequency signal of 750-1100GHz band is obtained through the fourth signal generation frequency multiplier.

The signal receiving unit comprises at least three groups of signal receiving frequency multipliers connected in series and at least two groups of signal receiving amplifiers, the output end of the first signal receiving frequency multiplier is connected with the input end of the first signal receiving amplifier, the output end of the first signal receiving amplifier is connected with the input end of the second signal receiving frequency multiplier, the output end of the second signal receiving frequency multiplier is connected with the input end of the second signal receiving amplifier, the output end of the second signal receiving amplifier is connected with the input end of the third signal receiving frequency multiplier, the third signal receiving frequency multiplier sends a local oscillation signal, and the output end of the third signal receiving frequency multiplier is connected with the frequency mixer.

The first signal receiving frequency multiplier and the second signal receiving frequency multiplier amplify the frequency band of the input signals by two times, and the third signal receiving frequency multiplier amplifies the input signals by three times to obtain the required local oscillation signals.

The first signal receiving frequency multiplier receives local oscillation signals of 10.41-15.28GHz frequency band provided by the microwave vector network analyzer, and the local oscillation signals of 20.83-30.56GHz frequency band are obtained and sent to the second signal receiving frequency multiplier through amplification of the first signal receiving frequency multiplier and the first signal receiving amplifier.

The second signal receiving frequency multiplier obtains a local oscillation signal of a 41.66-61.2GHz frequency band, and the local oscillation signal is sent to the second signal receiving amplifier to drive the third signal receiving frequency multiplier.

The third signal receiving frequency multiplier obtains a local oscillation driving signal of a 125-183.34GHz frequency band and sends the local oscillation driving signal to the frequency mixer.

The mixer receives the local oscillation signal and the radio frequency signal of the 750-and-1100 GHz frequency band sent by the signal generating unit to form an intermediate frequency, and the intermediate frequency is respectively output from the reference intermediate frequency output port and the test intermediate frequency output port.

Compared with the prior art, the above one or more technical schemes have the following beneficial effects:

1. the signal generating and receiving units adopt a 72-time solid-state cascade frequency multiplication/mixing method, and the microwave vector network analyzer host provides 10.41GHz-15.28GHz radio frequency and local oscillator input signals.

2. The microwave vector network analyzer with the spread spectrum function and the highest frequency band exceeding 16GHz is matched with two signal receiving units with the frequency bands of 0.75THz-1.1THz, so that the parameter test of the 0.75THz-1.1THz full-frequency band network can be realized, and the compatibility is high.

3. The signal generating and receiving chain circuit fully considers the efficiency and the complexity of the chain circuit, based on the current hardware base, the signal generating unit adopts the cascade frequency doubling scheme of multiplied by 2 multiplied by 3 multiplied by 4, so that the current power amplifier chip can meet the index requirement, and the final stage adopts the quadruplicate frequency multiplier to reduce the frequency and the complexity of the whole driving chain circuit.

4. The signal receiving unit adopts the sixth harmonic frequency mixing, the local oscillator driving link is multiplied by 2 multiplied by 3, the frequency range is 125-183.34GHz, the whole signal receiving link is fully compatible with performance indexes and realizability, and the whole circuit is easy to realize and prepare under the existing technical conditions.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a diagram of a hardware architecture provided by one or more embodiments of the invention;

FIG. 2 is a schematic diagram of a signal generation unit provided in one or more embodiments of the invention;

fig. 3 is a schematic diagram of a signal receiving unit according to one or more embodiments of the present invention;

fig. 4 is a schematic diagram of a frequency multiplier according to one or more embodiments of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples.

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As described in the background art, the existing implementation method of the network parameter testing spread spectrum device has the limitation that it is difficult to implement signal generation and signal reception in the frequency band of 0.75THz to 1.1THz, and these two parts are just key points for implementing the frequency band spread spectrum device, and the key points can also be used as demonstration prototypes or principle prototypes of terahertz signals to solve the problem of signal generation and reception in the core.

The first embodiment is as follows:

as shown in fig. 1-3, the terahertz signal network parameter testing spread spectrum device includes: the signal separation unit is provided with a test port and a radio frequency input port, the signal reception unit comprises a reference signal reception unit and a test signal reception unit, the reference signal reception unit and the test signal reception unit are connected together through a power separation module, the power separation module is provided with a local oscillator signal input port, the reference signal reception unit is provided with a reference intermediate frequency output port, and the test signal reception unit is provided with a test intermediate frequency output port.

The power separation module divides the 1 path of signals into 2 paths of signals and provides local oscillation driving signals with the same frequency for the reference signal receiving unit and the test signal receiving unit respectively.

In this embodiment, the signal separation unit is a bidirectional coupler with a frequency band of 0.75THz to 1.1THz, and may be a waveguide bidirectional coupler or a microstrip bidirectional coupler, and the coupler ports all need to be standard waveguide ports with WR 1.0.

The signal generating unit is a cascade frequency multiplication amplifying link, and adopts a 72-secondary cascade frequency multiplication scheme, which comprises the following specific steps:

the frequency multiplier comprises at least four groups of signal generation frequency multipliers connected in series and at least two groups of signal generation amplifiers, wherein the output end of a first signal generation frequency multiplier is connected with the input end of a first signal generation amplifier, the output end of the first signal generation amplifier is connected with the input end of a second signal generation frequency multiplier, the output end of the second signal generation frequency multiplier is connected with the input end of a second signal generation amplifier, the output end of the second signal generation amplifier is connected with the input end of a third signal generation frequency multiplier, the output end of the third signal generation frequency multiplier is connected with a fourth signal generation frequency multiplier, and the fourth signal generation frequency multiplier sends out radio-frequency signals of a required frequency band.

The first signal generation frequency multiplier amplifies the frequency band of an input signal by two times, the second signal generation frequency multiplier and the third signal generation frequency multiplier amplify the input signal by three times, and the fourth signal generation frequency multiplier amplifies the input signal by four times.

The entire signal generation path is as follows:

firstly, providing an input signal of a 10.41-15.28GHz frequency band by a host computer of a microwave vector network analyzer, and sending the input signal to a first signal generation frequency multiplier to obtain a signal of a 20.82-30.56GHz frequency band;

after passing through the first signal generation amplifier, driving a second signal generation frequency multiplier to obtain a radio frequency signal with a frequency range of 62.46-91.68GHz, and sending the radio frequency signal to the second signal generation amplifier;

the second signal generating amplifier is a 62.46-91.68GHz band amplifier, after power amplification, a 187.5-275GHz band frequency tripler (third signal generating frequency multiplier) and a final stage 750-plus-1100 GHz band quadrupler (fourth signal generating frequency multiplier) are continuously driven, the radio frequency signal of 187.5-275GHz band is obtained through the third signal generating frequency multiplier, and the radio frequency signal of 750-plus-1100 GHz band is obtained through the fourth signal generating frequency multiplier.

In the process of the signal generation path, the microwave vector network analyzer host provides an input signal with a frequency range of 10.41-15.28GHz, and the input signal is input to a signal generation unit of the terahertz signal network parameter testing spread spectrum device through a radio frequency input port.

The signal receiving unit is a frequency mixing receiving link, the hardware structures of the reference signal receiving unit and the test signal receiving unit are the same, the final-stage frequency mixer adopts a sixth harmonic frequency mixing scheme, and the local oscillator driving link of the frequency mixer is 12 times, specifically as follows:

the frequency multiplier comprises at least three groups of signal receiving frequency multipliers connected in series and at least two groups of signal receiving amplifiers, wherein the output end of a first signal receiving frequency multiplier is connected with the input end of a first signal receiving amplifier, the output end of the first signal receiving amplifier is connected with the input end of a second signal receiving frequency multiplier, the output end of the second signal receiving frequency multiplier is connected with the input end of a second signal receiving amplifier, the output end of the second signal receiving amplifier is connected with the input end of a third signal receiving frequency multiplier, the third signal receiving frequency multiplier sends a local oscillation signal, and the output end of the third signal receiving frequency multiplier is connected with a frequency mixer.

The first signal receiving frequency multiplier and the second signal receiving frequency multiplier amplify the frequency band of the input signal by two times, the third signal receiving frequency multiplier amplifies the input signal by three times to obtain a required local oscillation signal, and a specific link of the frequency mixer is as follows:

the microwave vector network analyzer host provides and provides 10.41-15.28GHz input signals, drives a frequency multiplier (a first signal receiving frequency multiplier) of a 20.83-30.56GHz frequency band and a first signal receiving amplifier to amplify, and obtains signals of the 20.83-30.56GHz frequency band;

then, amplifying the signals by a 41.66-61.2GHz frequency band (a second signal receiving frequency multiplier) and a second signal receiving amplifier to obtain signals of the 41.66-61.2GHz frequency band, and driving a third signal receiving frequency multiplier to work;

the frequency multiplier (third signal receiving frequency multiplier) with the 125-183.34GHz frequency band provides a local oscillation driving signal with the 125-183.34GHz frequency band for the mixer, and after the mixer completes six times of frequency mixing, the mixer receives the radio frequency signal with the 750-plus-1100 GHz frequency band sent by the signal generating unit to form intermediate frequency output which is respectively output from the reference intermediate frequency output port and the test intermediate frequency output port.

In this embodiment, the mixer is used for down-conversion, that is, the radio frequency (750-; the intermediate frequency port is an intermediate frequency signal output port.

The signal generating unit is used for providing signal excitation output of the corresponding frequency band.

The reference path obtains the amplitude and phase information of the signal generating unit through the intermediate frequency signal down-converted by the mixer, namely, the signal is definitely sent; the test path obtains the amplitude and phase information of the received signal to be tested, namely the received signal is determined through the intermediate frequency of the down-conversion of the mixer of the test path, and the S parameter full information of the test port can be obtained through the combination of the two paths.

The signal separation unit is used for separating the input signal and the output signal, so that the output signal enters the reference path, the input signal enters the test path, and meanwhile, the isolation characteristic between the input signal and the test signal is ensured.

The working process is as follows: the vector network analyzer host provides radio frequency and local oscillator input signals for the frequency spreading device, so that the signal generating unit, the test unit and the reference unit work normally, the signal generating unit enters the reference unit from the signal separation unit while outputting normal signals, the intermediate frequency output signal of the reference unit indirectly obtains related parameters of the output signal of the signal generating unit, the signal reflected by the to-be-tested piece enters the test unit from the separation unit, the related parameters of the reflected signal are indirectly obtained by testing the intermediate frequency output signal, and the related parameters of the output signal and the reflected signal are calculated to obtain S parameters.

The entire drive chain of the signal receiving unit consists of only three components: a second frequency multiplier amplifier (a first signal receiving frequency multiplier and a first signal receiving amplifier are integrated) of 20.83-30.56GHz band, a second frequency multiplier amplifier (a second signal receiving frequency multiplier and a second signal receiving amplifier are integrated) of 41.66-61.2GHz band and a third frequency multiplier (a third signal receiving frequency multiplier) of 125-183.34GHz band;

or two components: a quadruplicated frequency amplifier of 41.66-61.2GHz band and a GHz tripler of 125-183.34 band.

The terahertz signal network parameter testing spread spectrum device with the structure is high in compatibility, concise and efficient in link and easy to realize.

Regarding the compatibility is high: the signal generating unit and the signal receiving unit both adopt a 72-time solid cascade frequency doubling/mixing method (wherein, the signal generating unit is multiplied by 2 multiplied by 3 multiplied by 4 cascade frequency, the signal receiving unit is multiplied by 2 multiplied by 3 multiplied by 6 cascade frequency + mixing, and the multiplied by 6 part is mixing frequency), a microwave vector network analyzer host machine provides 10.41GHz-15.28GHz radio frequency and local oscillator input signals, and the power is about 6-10 dBm; namely, the microwave vector network analyzer with the spread spectrum function and the highest frequency band exceeding 16GHz is matched with two network parameter testing spread spectrum devices of 0.75THz-1.1THz frequency bands, so that the 0.75THz-1.1THz full-frequency band network parameter testing can be realized;

the above method has low requirement on the working frequency of the host, and the required radio frequency and local oscillator input frequency is not high, and is 15.28GHz at the highest, that is, the vector network analyzer with the working frequency covering up to 15.28GHz at the highest can realize the 750-plus-1100 GHz spread spectrum test, and compared with the existing spread spectrum device, for example, the device needs 21GHz or 42GHz driving frequency, and the like, the compatibility is higher.

The link is simple and efficient, and is easy to realize: the signal generating and receiving link fully considers the efficiency and the complexity of the link, based on the current hardware basis, the signal generating unit adopts a scheme of multiplied by 2 multiplied by 3 multiplied by 4, the frequency range of a main power amplifier is 62.46-91.68GHz, the current power amplifier chip can meet the index requirement, and the final stage adopts a fourth-time frequency multiplier to reduce the frequency and the complexity of the whole driving link; the signal receiving unit adopts the sixth harmonic frequency mixing, the local oscillator driving link is multiplied by 2 multiplied by 3, the frequency range is 125-183.34GHz, and the whole signal receiving link is fully compatible with performance indexes and realizability; in the scheme provided by the embodiment, all parts of components and circuits are actually verified or realized, and the whole circuit is easy to realize and prepare under the existing technical conditions.

Regarding the frequency multiplier, the final frequency multiplier adopts a 0.75THz-1.1THz broadband high-efficiency frequency multiplier based on waveguide microstrip cooperative matching filtering, as shown in fig. 4, the frequency multiplier comprises an input waveguide, an output waveguide and a frequency multiplier circuit, wherein the frequency multiplier circuit comprises an input probe, a matching filter network and a diode pair connected in series in the same direction, the input waveguide frequency range is 187.5GHz-275GHz, a proper number of protruding branches (the waveguide narrow edge length is increased) are added according to the impedance matching requirement, and the matching filter network on the microstrip is combined to provide impedance matching and filtering functions for the diode pair together, so that the purpose of high-efficiency work of the frequency multiplier is achieved. The output waveguide and the diode pair form a balun structure to extract fourth harmonic signals output by the diodes, namely 0.75THz-1.1THz frequency band signals.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.