A broadband high-performance millimeter-wave and terahertz signal source

Abstract

The present invention belongs to the field of millimeter wave and terahertz signal sources, and specifically relates to a broadband high-performance millimeter wave and terahertz signal source. It comprises a microwave signal source (101) and a broadband millimeter wave and terahertz signal generation link connected to the microwave signal source (101); the microwave signal source (101) is used to output a broadband microwave signal; the broadband millimeter wave and terahertz signal generation link is used to amplify, filter, segment the broadband microwave signal, use a duplexer to achieve signal frequency synthesis of two frequency bands, use an equalizer to perform gain equalization, use an electrically adjustable attenuator and a power amplifier to achieve power regulation, and use a directional coupler, a detector and an amplitude stabilization loop to perform power amplitude stabilization. The broadband millimeter wave and terahertz high-performance signal source solution provided by the present invention is segmented by using the switch of the microwave frequency band in the spectrum expansion module, and combined with the suppression characteristics of each level of frequency multipliers, assisted by a filter, to achieve filtering of the signals of each level of frequency multipliers.

Description

Technical Field

[0001] The present invention belongs to the field of millimeter wave and terahertz signal sources, and in particular relates to a broadband high-performance millimeter wave and terahertz signal source. Background Art

[0002] With the continuous deepening of research and application transformation in the fields of millimeter wave and terahertz radar, deep space exploration, meteorological remote sensing, scaled-down testing, non-destructive testing, etc., higher requirements are put forward for broadband millimeter wave and terahertz excitation signal sources, especially the purity of the signal. Therefore, how to improve the signal purity of millimeter wave and terahertz signal sources (especially above 110GHz) to meet the testing requirements of device components, complete machines and systems has become the focus of the industry.

[0003] Millimeter wave and terahertz signal sources are essential test instruments for the development of millimeter wave and terahertz devices and systems. Due to the high frequency, waveguide transmission lines (especially above 110GHz) are usually used. By analyzing domestic and foreign references and products, the main technical route of existing broadband millimeter wave and terahertz signal sources is the technical route of microwave signal source + millimeter wave and terahertz spectrum expansion module. The signal source host provides the excitation signal required by the spectrum expansion module. The spectrum expansion module uses a frequency doubling link to achieve the frequency doubling of the input microwave signal, relocate the frequency to the millimeter wave and terahertz frequency band, and output it through the waveguide port. This traditional technical route is relatively simple and easy to implement, and can achieve the generation of millimeter wave and terahertz signals, but due to There are many nonlinear devices in the frequency multiplication chain. The higher the frequency, the more stages of nonlinear devices there are. Each stage of the frequency multiplication device not only generates the main signal with the required frequency multiplication number, but also generates unnecessary spurious signals. For example, for a doubler, the doubled frequency of the input signal of the doubler is the main signal. Similarly, the input fundamental signal, tripled frequency signal, quadruple frequency signal, etc. will also be output together with the main signal (doubled frequency signal). Even if the frequency multiplier adopts a multi-balanced circuit, a balanced even-order frequency multiplier can suppress odd-order harmonics, and an odd-order frequency multiplier can suppress even-order harmonics, but because the circuit is not completely ideally symmetrical, the theoretical suppression effect cannot be achieved, so other signals still exist. In addition, the nonlinearity of the frequency multiplier can not only perform frequency multiplication, but also mixing. The main signal injected into the frequency multiplication is mixed with other noise signals. These mixing products and other unnecessary frequency multiplication signals generated by the frequency multiplier will constitute the spurious spectrum of the frequency multiplier output signal together with the main signal. If certain technical means are not used to filter out these spurious spectra, the more technologies of the frequency multiplier cascade, the more serious the spurious signals will be, until the spurious signals can be comparable to the main signal, resulting in not only poor purity of the generated millimeter-wave and terahertz signals, but also difficulty in high-precision amplitude stabilization and power regulation due to the poor purity of the main signal, which cannot meet the testing requirements of millimeter-wave and terahertz devices, components, complete machines and systems. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a broadband high-performance millimeter wave and terahertz signal source.

[0005] The present invention is achieved through the following technical solutions: A broadband high-performance millimeter wave and terahertz signal source, comprising a microwave signal source and a broadband millimeter wave and terahertz signal generation link connected to the microwave signal source; The microwave signal source is used to output a broadband microwave signal; The broadband millimeter wave and terahertz signal generation link is used to amplify, filter, and segment the broadband microwave signal, use a duplexer to achieve signal frequency synthesis of two frequency bands, use an equalizer to perform gain equalization, use an electrically adjustable attenuator and a power amplifier to achieve power regulation, and perform power stabilization through a directional coupler, a detector, and an amplitude stabilization loop.

[0006] Furthermore, the broadband millimeter wave and terahertz signal generation link includes: a first amplifier, a first bandpass filter, a single-pole double-throw switch for dividing the signal into two signals, a first frequency band signal and a second frequency band signal, a first frequency band signal processing sub-link, a second frequency band signal processing sub-link, a duplexer, an equalizer, an electrically adjustable attenuator, a sixth amplifier, a coupler, a detector, and an amplitude stabilization loop.

[0007] Further, the first frequency band signal processing sub-link includes a first double-balanced frequency doubler, a second bandpass filter, a second amplifier, a first double-balanced frequency tripler, a fourth amplifier, a fourth bandpass filter, and a third double-balanced frequency doubler connected in sequence; The second frequency band signal processing sub-chain includes a second double-balanced frequency doubler, a third bandpass filter, a third amplifier, a second double-balanced frequency tripler, a fifth amplifier, a fifth bandpass filter, and a fourth double-balanced frequency doubler connected in sequence.

[0008] Furthermore, the radio frequency port on the microwave signal source is connected to the coaxial connector of the first amplifier via a coaxial cable; the broadband microwave signal output by the microwave signal source is transmitted to the first amplifier via the coaxial cable; The first amplifier, the first bandpass filter, and the single-pole double-throw switch are connected in sequence; The first double-balanced frequency doubler in the first-band signal processing sub-link and the second double-balanced frequency doubler in the second-band signal processing sub-link are both connected to the single-pole double-throw switch; And the third double-balanced doubler in the first frequency band signal processing sub-link and the fourth double-balanced doubler in the second frequency band signal processing sub-link are both connected to the duplexer; the duplexer, the equalizer, the electrically adjustable attenuator, the sixth amplifier, the coupler, the detector and the amplitude stabilization loop are connected in sequence.

[0009] Furthermore, the passband of the first bandpass filter corresponds to the frequency band of the broadband microwave signal output by the microwave signal source.

[0010] Furthermore, the single-pole double-throw switch is connected to the USB port of the microwave signal source, and the control level of the single-pole double-throw switch is used to select the first frequency band signal and the second frequency band signal through the USB port; The first frequency band signal is injected into the first frequency band signal processing sublink for amplification and filtering; The second frequency band signal is injected into the second frequency band signal processing sub-link for amplification and filtering.

[0011] Furthermore, the signals of the two frequency bands processed by the first frequency band signal processing sublink and the second frequency band signal processing sublink are subjected to signal frequency synthesis through a duplexer, and harmonic signals of the signals of the two frequency bands are filtered out through the duplexer.

[0012] Furthermore, the equalizer equalizes the transmission loss formed by the cross-band of the frequency synthesis to generate a signal output with high flatness. The output power of the equalizer output signal is adjusted by the electrically adjustable attenuator and is power amplified by the sixth amplifier.

[0013] Furthermore, the signal amplified by the sixth amplifier is processed by a coupler, and the coupler outputs two signals, one of which is directly output through the coupler through the through port, and the other coupled signal is detected by a detector.

[0014] Further, the amplitude stabilization loop is connected to a USB port of the microwave signal source, and the amplitude stabilization loop is connected to the electrically adjustable attenuator; The detection voltage of the detector is compared with the reference point level placed in the USB port of the microwave signal source through the amplitude stabilization loop to achieve power regulation of the electrically adjustable attenuator, and then to achieve amplitude stabilization and regulation of the output power of the coupler through port. Beneficial technical effects of the present invention: Compared with the prior art solutions, the broadband millimeter-wave and terahertz high-performance signal source solution proposed in the present invention uses the switch of the microwave frequency band in the spectrum expansion module to segment, and combines it with the suppression characteristics of each level of frequency multipliers, assisted by the filter, to achieve filtering of the signals of each level of frequency multipliers; and in view of the dilemma of lack of high-performance switches in the high-frequency band, a duplexer is used to combine the frequency of the frequency band signals, and the frequency synthesizer also meets the requirement of further improving the signal purity; in view of the problem of large signal transmission loss in the two sidebands of the duplexer signal, which affects the gain flatness of the main signal and further affects the suppression of spurious signals, an equalizer is used to perform gain equalization, and on the basis of the generation of this high-purity signal, an electrically adjustable attenuator and a power amplifier are used to achieve power regulation, and a directional coupler, a detector and an amplitude stabilization loop are used to perform power stabilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a broadband high-performance millimeter-wave and terahertz signal source in an embodiment of the present invention; The reference numerals are: 101. microwave signal source; 102. radio frequency port; 103. coaxial cable; 104. first amplifier; 105. first bandpass filter; 106. single-pole double-throw switch; 107. first double-balanced frequency doubler; 108. second double-balanced frequency doubler; 109. second bandpass filter; 110. third bandpass filter; 111. second amplifier; 112. third amplifier; 113. first double-balanced frequency tripler; 114. second double-balanced frequency tripler balanced tripler; 115. fourth amplifier; 116. fifth amplifier; 117. fourth bandpass filter; 118. fifth bandpass filter; 119. third double-balanced doubler; 120. fourth double-balanced doubler; 121. duplexer; 122. equalizer; 123. electrically adjustable attenuator; 124. sixth amplifier; 125. coupler; 126. coupler pass-through port; 127. detector; 128. amplitude stabilization loop; 129. USB port. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.

[0018] The present invention aims at the problems of many spurious signals and low signal purity in the existing millimeter wave and terahertz broadband signal sources, and makes breakthrough innovations, and proposes a solution for realizing a high-purity signal source. The solution also takes the microwave signal source as a platform, uses the microwave frequency band switch in the spectrum expansion module for segmentation, and combines with the suppression characteristics of each level of frequency multipliers, and assists with the filter to realize the spurious filtering of the signal band of each level of frequency multipliers, so as to meet the demand for the generation of high-purity millimeter wave and terahertz signals, and in view of the dilemma of lack of high-performance switches in the high-frequency band, uses a duplexer to combine the frequency of the frequency band signal, and the frequency synthesizer also meets the requirement of further improving the signal purity. Due to the problem of large signal transmission loss in the two sidebands of the duplexer signal, the gain flatness of the main signal is affected, and then the spurious signal suppression is affected. In view of this problem, an equalizer is used for equalization. On the basis of the generation of high-purity signals, power regulation is realized by cooperating with an electrically adjustable attenuator and a power amplifier, and power amplitude stabilization is performed through a directional coupler, a detector and an amplitude stabilization loop, and finally a millimeter wave and terahertz high-performance signal source is realized.

[0019] A broadband high-performance millimeter wave and terahertz signal source, comprising a microwave signal source 101 and a broadband millimeter wave and terahertz signal generation link connected to the microwave signal source 101; The microwave signal source 101 is used to output broadband microwave signals; The broadband millimeter wave and terahertz signal generation link is used to amplify, filter, and segment the broadband microwave signal, use a duplexer to achieve signal frequency synthesis of two frequency bands, use an equalizer to perform gain equalization, use an electrically adjustable attenuator and a power amplifier to achieve power regulation, and perform power stabilization through a directional coupler, a detector, and an amplitude stabilization loop.

[0020] In this embodiment, the broadband millimeter wave and terahertz signal generation link includes: a first amplifier 104, a first bandpass filter 105, a single-pole double-throw switch 106 for dividing the signal into two signals, a first frequency band signal and a second frequency band signal, a first frequency band signal processing sub-link, a second frequency band signal processing sub-link, a duplexer 121, an equalizer 122, an electrically adjustable attenuator 123, a sixth amplifier 124, a coupler 125, a detector 127, and an amplitude stabilization loop 128.

[0021] In this embodiment, the first frequency band signal processing sub-link includes a first double-balanced frequency doubler 107, a second bandpass filter 109, a second amplifier 111, a first double-balanced frequency tripler 113, a fourth amplifier 115, a fourth bandpass filter 117, and a third double-balanced frequency doubler 119 connected in sequence; The second frequency band signal processing subchain includes a second double-balanced frequency doubler 108, a third bandpass filter 110, a third amplifier 112, a second double-balanced frequency tripler 114, a fifth amplifier 116, a fifth bandpass filter 118, and a fourth double-balanced frequency doubler 120 connected in sequence.

[0022] In this embodiment, the radio frequency port 102 on the microwave signal source 101 is connected to the first amplifier 104 via a coaxial cable 103; the broadband microwave signal output by the microwave signal source 101 is transmitted to the first amplifier 104 via the coaxial cable 103; The first amplifier 104, the first bandpass filter 105, and the single-pole double-throw switch 106 are connected in sequence; The first double-balanced frequency doubler 107 in the first-band signal processing sub-link and the second double-balanced frequency doubler 108 in the second-band signal processing sub-link are both connected to the single-pole double-throw switch 106; And the third double-balanced doubler 119 in the first frequency band signal processing sub-link and the fourth double-balanced doubler 120 in the second frequency band signal processing sub-link are both connected to the duplexer 121; the duplexer 121, the equalizer 122, the electrically adjustable attenuator 123, the sixth amplifier 124, the coupler 125, the detector 127 and the amplitude stabilization loop 128 are connected in sequence.

[0023] In this embodiment, the passband of the first bandpass filter 105 corresponds to the frequency band of the broadband microwave signal output by the microwave signal source 101 .

[0024] In this embodiment, the SPDT switch 106 is connected to the USB port 129 of the microwave signal source 101 , and the control level of the SPDT switch is used to select the first frequency band signal and the second frequency band signal through the USB port 129 .

[0025] The first frequency band signal is injected into the first frequency band signal processing sublink for amplification and filtering; The second frequency band signal is injected into the second frequency band signal processing sub-link for amplification and filtering.

[0026] Specifically, the first frequency band signal is injected into the first double-balanced doubler 107 to generate a double frequency signal of the injected signal, and the fundamental wave, the third harmonic signal, the fourth harmonic frequency band low-end signal, the fourth harmonic high-band signal and the fifth harmonic signal of the injected signal of the first double-balanced doubler 107 are filtered out by the second band-pass filter 109, and the second amplifier 111 is used to suppress it. The second amplifier 111 amplifies the input signal, and the amplified signal is injected into the first double-balanced tripler 113 to generate a triple frequency signal corresponding to the injected signal of the first double-balanced tripler 113. After amplification by the fourth amplifier 115, the second harmonic signal and the fourth harmonic signal of the injected signal of the first double-balanced tripler 113 are filtered out by the fourth band-pass filter 117, and the signal processed by the fourth band-pass filter 117 drives the third double-balanced doubler 119 to generate a double frequency signal of the injected signal; The second frequency band signal is injected into the second double-balanced doubler 108 to generate a double frequency signal of the injection signal of the second double-balanced doubler 108, and the fundamental wave, the third harmonic signal, the fourth harmonic frequency band low-end signal, the fourth harmonic high-band signal and the fifth harmonic signal of the injection signal of the second double-balanced doubler 108 are filtered out by the third band-pass filter 110, and suppressed by the third amplifier 112. The third amplifier 112 amplifies the input signal, and the amplified signal is injected into the second double-balanced tripler 114 to generate a triple frequency signal corresponding to the injection signal of the second double-balanced tripler 114. After amplification by the fifth amplifier 116, the second harmonic signal and the fourth harmonic signal of the injection signal of the second double-balanced tripler 114 are filtered out by the fifth band-pass filter 118, and the signal processed by the fifth band-pass filter 118 drives the fourth double-balanced doubler 120 to generate a double frequency signal corresponding to the injection signal.

[0027] In this embodiment, the signals of the two frequency bands processed by the first frequency band signal processing sublink and the second frequency band signal processing sublink are subjected to signal frequency synthesis by the duplexer 121 , and the harmonic signals of the signals of the two frequency bands are filtered out by the duplexer 121 .

[0028] In this embodiment, the equalizer 122 equalizes the transmission loss formed by the cross-band of the frequency synthesis to generate a highly flat signal output. The output signal of the equalizer 122 is adjusted in output power by the electrically adjustable attenuator 123 and is power amplified by the sixth amplifier 124.

[0029] In this embodiment, the signal amplified by the sixth amplifier 124 is processed by the coupler 125 , and the coupler 125 outputs two signals, one of which is directly output through the coupler through port 126 , and the other coupled signal is detected by the detector 127 .

[0030] In this embodiment, the detection voltage of the detector 127 is compared with the reference point level placed in the USB port 129 of the microwave signal source 101 through the amplitude stabilization loop 128 to achieve power regulation of the electrically adjustable attenuator 123, thereby achieving amplitude stabilization and regulation of the output power of the coupler through port 126.

[0031] The amplitude stabilization loop 128 is connected to the USB port 129 of the microwave signal source 101 , and is also connected to the electrically adjustable attenuator 123 .

[0032] The present invention aims at the high performance index requirements of the millimeter wave and terahertz signal sources, such as broadband, high purity, and stable amplitude, and focuses on solving the contradiction between broadband and high purity. Figure 1 The solution shown is illustrated by taking the generation of broadband high-performance signals in the 170GHz-260GHz frequency band as an example.

[0033] Depend on Figure 1It can be seen that the broadband millimeter wave and terahertz signal source (taking the 170GHz-260GHz frequency band as an example) is mainly composed of a microwave signal source 101 and a broadband millimeter wave and terahertz signal generation link. The specific working principle is as follows: the microwave signal source 101 outputs a broadband microwave signal in the 14.16GHz-21.67GHz frequency band through the RF port 102, and transmits it to the first amplifier 104 of the millimeter wave and terahertz signal generation link through the coaxial cable 103. The signal amplified by the first amplifier 104 passes through the first bandpass filter 105 with a passband of 14.16GHz-21.67GHz to filter out harmonic signals, and is divided into two frequency bands of 14.16GHz-17.58GHz and 17.58GHz-21.67GHz through the single-pole double-throw switch 106. The 14.16GHz-17.58GHz frequency band signal is injected into the first double-throw switch 106. The balanced doubler 107 generates a double frequency signal of 28.32 GHz-35.17 GHz, and filters out the fundamental wave and third harmonic signals of 14.16 GHz-17.58 GHz and 42.5 GHz-52.75 GHz, and the low-end signal of the fourth harmonic of 56.66 GHz-70.33 GHz through the second bandpass filter 109. The high-frequency band signal of the fourth harmonic and the higher-order fifth harmonic signal of 70.83 GHz-87.92 GHz are suppressed through the second amplifier 111. The second amplifier 111 amplifies the 28.32 GHz-35.17 GHz signal. The amplified 28.32 GHz-35.17 GHz frequency band signal is injected into the first double balanced tripler 113 to generate a signal of 85 GHz-105.5 GHz, and the 56.67 GHz signal is filtered out through the fourth bandpass filter 117. The -70.33 GHz second harmonic signal and the 113.33 GHz-140.67 GHz fourth harmonic signal, and the 85 GHz-105.5 GHz signal passing through the fourth bandpass filter 117 drive the third double-balanced frequency doubler 119 to generate a 170 GHz-211 GHz signal.The other signal of the 17.58 GHz-21.67 GHz frequency band through the single-pole double-throw switch 106 is fed into the second double-balanced doubler 108 to generate a doubled frequency signal of 35.16 GHz-43.33 GHz, and the third band pass filter 110 is used to filter out the fundamental wave of 17.58 GHz-21.67 GHz and 52.75 GHz-65 GHz, the third harmonic signal and the fourth harmonic signal, and the low frequency band signal of 70.33 GHz-86.67 GHz, and the fourth harmonic signal. The high frequency band signal of the wave and the fifth harmonic signal of 87.92 GHz-108.33 GHz are suppressed by the third amplifier 112, and the third amplifier 112 amplifies the 35.16 GHz-43.33 GHz signal. The amplified 35.16 GHz-43.33 GHz frequency band signal is injected into the second double balanced tripler 114 to generate a signal in the 105.5 GHz-130 GHz frequency band, and the second harmonic signal of 70.33 GHz-86.66 GHz and the fourth harmonic signal of 140.66 GHz-173.33 GHz are filtered out by the fifth band pass filter 118. The 105.5 GHz-130 GHz signal passing through the fifth band pass filter 118 drives the fourth double balanced doubler 120 to generate a 211 GHz-260 GHz signal. The signals of the two frequency bands of 170GHz-211GHz and 211GHz-260GHz generated by the upper and lower links are frequency synthesized by the duplexer 121. At the same time, the filtering characteristics of the duplexer are used to filter out the harmonic signals of the two frequency bands of 170GHz-211GHz and 211GHz-260GHz. The larger transmission loss formed near the cross band 211GHz of the duplexer 121 is equalized by the equalizer 122, and finally a high-flatness signal output is generated. The output signal after the equalizer 122 is adjusted for output power by the electrically adjustable attenuator 123, and the output signal after the equalizer 122 is adjusted for output power by the electrically adjustable attenuator 123. The sixth amplifier 124 performs power amplification. The sixth amplifier 124 is placed after the electrically adjustable attenuator 123 to eliminate the effect of the insertion loss of the electrically adjustable attenuator 123 on the maximum output power of the coupler through port 126. The signal amplified by the sixth amplifier 124 passes through the coupler 125 and is directly output through the coupler through port. The coupled signal is detected by the detector 127. The detection voltage is compared with the reference point level placed in the USB port 129 of the microwave signal source 101 through the amplitude stabilization loop 128 to achieve power regulation of the electrically adjustable attenuator, thereby achieving amplitude stabilization and regulation of the output power of the coupler through port 126. The control level of the single-pole double-throw switch 106 is controlled through the USB port 129 to select the two frequency bands of 14.16GHz-17.58GHz and 17.58GHz-21.67GHz.

[0034] In this embodiment, the single-pole double-throw switch 106 selects the first frequency band signal and the second frequency band signal based on the following: the first frequency band signal and the second frequency band signal after being doubled by the first double-balanced doubler 107 and the second double-balanced doubler 108 respectively do not overlap with the fundamental signal and the third harmonic signal, and the frequency deviation of the two adjacent signals is above 6.5%.

[0035] Specifically, after the first frequency band signal is doubled by the first double-balanced doubler 107, the adjacent 1st and 3rd harmonics and the 2nd frequency-doubled signal do not overlap, and the frequency deviation of the two adjacent signals is greater than 6.5%; after the second frequency band signal is doubled by the second double-balanced doubler 108, the adjacent 1st and 3rd harmonics and the 2nd frequency-doubled signal do not overlap, and the frequency deviation of the two adjacent signals is greater than 6.5%; Taking the processing of the first frequency band signal by the first frequency band signal processing sublink as an example, in this embodiment, the 14.16GHz-21.67GHz frequency band signal is divided into two frequency bands, 14.16GHz-17.58GHz and 17.58GHz-21.67GHz, through the switch. The signal after double frequency is 28.33GHz-35.16GHz, and the signal closest to 28.33 is the high-end signal of the fundamental wave, 17.58GHz, which deviates by 37.9% relative to 28.32, and the signal closest to the 35.16GHz signal is the tripled signal of 42.5GHz-52.75GHz, and the low-end signal 42.5GHz deviates by 6.87GHz from 35.16GHz, which deviates by 20.8% relative to 35.16GHz. The second bandpass filter 109 is set to a passband of 28.32GHz-35.16GHz, which can filter out the 1st and 3rd order clutter signals. Similarly, after the signal of 28.33GHz-35.16GHz is tripled by the first double-balanced tripler 113, the output signal is 85-105.5GHz, and the signal closest to 85GHz is the doubled signal of 35.67GHz, which is 70.33GHz, which deviates from 85GHz 17.2%, the signal closest to 105.5GHz is 28.32GHz, and the 4th harmonic signal is 113.33GHz, which is 7% deviation. The passband of the fourth bandpass filter 117 is 85GHz-105.5GHz. By properly designing the rectangular coefficient of the filter, the signals of 56.66-70.33GHz and 113.33GHz-140.66GHz can be filtered out to ensure the purity of the 3-fold frequency signal. Similarly, the second frequency band signal processing sub-link follows the same principle for processing the second frequency band signal.

[0036] The present invention proposes an implementation scheme for a high-purity signal source. The scheme also takes a microwave signal source as a platform, utilizes the switch of the microwave frequency band in a spectrum expansion module for segmentation, and combines it with the suppression characteristics of each level of frequency multipliers, and assists in filtering out the signals of each level of frequency multipliers. In view of the dilemma of lack of high-performance switches in the high-frequency band, a duplexer is used to perform frequency combination of the frequency band signals. The frequency synthesizer also meets the requirement of further improving the signal purity. In view of the problem that there is a large signal transmission loss in the two sidebands of the duplexer signal, which affects the gain flatness of the main signal and further affects the suppression of spurious signals, an equalizer is used for gain equalization, and on the basis of the generation of this high-purity signal, power regulation is achieved by cooperating with an electrically adjustable attenuator and a power amplifier, and power amplitude stabilization is performed by a directional coupler, a detector and an amplitude stabilization loop, thereby finally realizing a millimeter-wave and terahertz high-performance signal source.

[0037] The present invention solves the contradiction between wide bandwidth of millimeter wave and terahertz signal sources and high signal purity and high-precision stable amplitude power regulation.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A broadband high-performance millimeter wave and terahertz signal source, characterized in that: It comprises a microwave signal source (101) and a broadband millimeter wave and terahertz signal generation link connected to the microwave signal source (101); The microwave signal source (101) is used to output a broadband microwave signal; The broadband millimeter wave and terahertz signal generation link is used to amplify, filter, and segment the broadband microwave signal, use a duplexer to achieve signal frequency synthesis of two frequency bands, use an equalizer to perform gain equalization, use an electrically adjustable attenuator and a power amplifier to achieve power regulation, and perform power stabilization through a directional coupler, a detector, and an amplitude stabilization loop.

2. A broadband high-performance millimeter wave and terahertz signal source according to claim 1, characterized in that: The broadband millimeter wave and terahertz signal generation link comprises: a first amplifier (104), a first bandpass filter (105), a single-pole double-throw switch (106) for dividing a signal into two signals, a first frequency band signal and a second frequency band signal, a first frequency band signal processing sub-link, a second frequency band signal processing sub-link, a duplexer (121), an equalizer (122), an electrically adjustable attenuator (123), a sixth amplifier (124), a coupler (125), a detector (127), and an amplitude stabilization loop (128).

3. A broadband high-performance millimeter wave and terahertz signal source according to claim 2, characterized in that: The first frequency band signal processing sub-link comprises a first double-balanced frequency doubler (107), a second band-pass filter (109), a second amplifier (111), a first double-balanced frequency tripler (113), a fourth amplifier (115), a fourth band-pass filter (117), and a third double-balanced frequency doubler (119) which are connected in sequence; The second frequency band signal processing sub-link comprises a second double-balanced frequency doubler (108), a third band-pass filter (110), a third amplifier (112), a second double-balanced frequency tripler (114), a fifth amplifier (116), a fifth band-pass filter (118), and a fourth double-balanced frequency doubler (120), which are connected in sequence.

4. A broadband high-performance millimeter wave and terahertz signal source according to claim 3, characterized in that: The broadband microwave signal output by the microwave signal source (101) is transmitted to the first amplifier (104) via a coaxial cable (103); The first amplifier (104), the first bandpass filter (105), and the single-pole double-throw switch (106) are connected in sequence; The first double-balanced frequency doubler (107) in the first-band signal processing sub-link and the second double-balanced frequency doubler (108) in the second-band signal processing sub-link are both connected to the single-pole double-throw switch (106); Furthermore, the third double-balanced frequency doubler (119) in the first frequency band signal processing sub-link and the fourth double-balanced frequency doubler (120) in the second frequency band signal processing sub-link are both connected to a duplexer (121); the duplexer (121), the equalizer (122), the electrically adjustable attenuator (123), the sixth amplifier (124), the coupler (125), the detector (127) and the amplitude stabilization loop (128) are connected in sequence.

5. A broadband high-performance millimeter wave and terahertz signal source according to claim 2, characterized in that: The passband of the first bandpass filter (105) corresponds to the frequency band of the broadband microwave signal output by the microwave signal source (101).

6. A broadband high-performance millimeter wave and terahertz signal source according to claim 4, characterized in that: The single-pole double-throw switch (106) is connected to the USB port (129) of the microwave signal source (101), and the control level of the single-pole double-throw switch is used to select two frequency band signals, the first frequency band signal and the second frequency band signal, through the USB port (129); The first frequency band signal is injected into the first frequency band signal processing sublink for amplification and filtering; The second frequency band signal is injected into the second frequency band signal processing sublink for amplification and filtering; The first frequency band signal and the second frequency band signal, after being frequency-doubled by the first double-balanced frequency doubler (107) and the second double-balanced frequency doubler (108) respectively, do not overlap with the fundamental wave signal and the third harmonic signal, and the frequency deviation of two adjacent signals is greater than 6.5%.

7. A broadband high-performance millimeter wave and terahertz signal source according to claim 6, characterized in that: The signals of the two frequency bands processed by the first frequency band signal processing sublink and the second frequency band signal processing sublink are subjected to signal frequency synthesis by a duplexer (121), and harmonic signals of the signals of the two frequency bands are filtered out by the duplexer (121).

8. A broadband high-performance millimeter wave and terahertz signal source according to claim 6, characterized in that: The equalizer (122) equalizes the transmission loss formed by the cross-band of the frequency synthesis to generate a signal output with high flatness. The output signal of the equalizer (122) is adjusted in output power through the electrically adjustable attenuator (123) and amplified in power through the sixth amplifier (124).

9. A broadband high-performance millimeter wave and terahertz signal source according to claim 6, characterized in that: The signal amplified by the sixth amplifier (124) is processed by a coupler (125), and the coupler (125) outputs two signals, one of which is directly output through the coupler through port (126), and the other coupled signal is detected by a detector (127).

10. A broadband high-performance millimeter wave and terahertz signal source according to claim 6, characterized in that: The amplitude stabilization loop (128) is connected to the USB port (129) of the microwave signal source (101), and the amplitude stabilization loop (128) is connected to the electrically adjustable attenuator (123); The detection voltage of the detector (127) is compared with a reference point level inserted into a USB port (129) of the microwave signal source (101) through an amplitude stabilization loop (128), thereby achieving power regulation of the electrically adjustable attenuator (123), thereby achieving amplitude stabilization and regulation of the output power of the coupler through port (126).

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