A terahertz broadband multi-band frequency multiplication chain integration system and method

Abstract

The embodiments of the present application relate to the field of spectral detection technology, and disclose a terahertz broadband multi-band frequency doubling chain integration system and method, including: a frequency doubling chain integration front end, the frequency doubling chain integration front end including: an initial local oscillator frequency source, a multi-stage coupler, and a multi-stage filter; a frequency doubling link group, the frequency doubling link group including: a local oscillator driving circuit layer corresponding to a plurality of preset terahertz high-frequency band signals, a plurality of broadband frequency multipliers corresponding to the preset terahertz high-frequency band signals, and a plurality of transmitting antennas corresponding to the preset terahertz high-frequency band signals. By combining the multi-stage coupler with the filter at the frequency doubling chain integration front end, the present application can realize that a frequency source drives multiple frequency doubling links at the same time, effectively reducing the volume of the front-end circuit, reducing the cost of the system, and improving the overall integration of the terahertz broadband multi-band frequency doubling chain system. At the same time, it effectively reduces the preset bandwidth and reduces the design difficulty of the frequency doubling link group when the waveguide port range is too large.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of spectral detection technology, and more specifically, to a terahertz broadband multi-band frequency doubling chain integration system and method. Background Art

[0002] Terahertz waves lie in the transition zone between macroscopic electronics and microscopic photonics. Due to their unique position in the electromagnetic spectrum, they possess a range of special properties. The vibrational and rotational energy levels of many gas molecules are mostly in the terahertz band, where they exhibit significant characteristic peak absorption. Their structure and properties can be analyzed through characteristic frequencies, providing precise fingerprint information for detection and identification. In order to utilize terahertz waves for real-time detection of the chemical molecular states of reactants, intermediates, and products during chemical reactions, it is necessary to build a terahertz spectroscopy detection system for chemical reaction experiments that can achieve rapid scanning. Among these, terahertz spectroscopy detection systems based on solid-state semiconductor devices can obtain high-resolution spectra at the MHz level at room temperature, enabling full characterization of the spectral characteristics of gas molecules.

[0003] To obtain as many spectral signals as possible from mixed materials, the terahertz signal transmission module in the system must be able to achieve broadband coverage of the frequency band, thus requiring multi-band integration. To cover the 0.1-1.5 THz frequency range, the traditional design architecture is a simple parallel connection, with each link designed independently, with different frequency sources driving different frequency-multiplying links. This results in excessively large front-end circuitry, high system costs, and limitations on overall system application. Therefore, improving the overall integration of broadband terahertz spectroscopy detection systems has become a pressing issue. Summary of the Invention

[0004] The embodiments of the present application provide a terahertz broadband multi-band frequency doubling chain integration system and method, aiming to improve the overall integration of a broadband terahertz spectroscopy detection system.

[0005] A first aspect of an embodiment of the present application provides a terahertz broadband multi-band frequency doubling chain integrated system, comprising:

[0006] A frequency multiplication chain integrated front end, comprising: an initial local oscillator frequency source, a multi-stage coupler, and a multi-stage filter; wherein the multi-stage coupler and the multi-stage filter are connected correspondingly according to the number of stages;

[0007] A frequency multiplication link group, the frequency multiplication link group comprising: a plurality of local oscillator driving circuit layers corresponding to preset terahertz high-frequency band signals, a plurality of broadband frequency multipliers corresponding to preset terahertz high-frequency band signals, and a plurality of transmitting antennas corresponding to preset terahertz high-frequency band signals; wherein the local oscillator driving circuit layers, the broadband frequency multipliers, and the transmitting antennas corresponding to the same preset terahertz high-frequency band signals are connected in sequence.

[0008] Optionally, the frequency multiplying chain integrated front end and the frequency multiplying chain group are connected accordingly in the following manner:

[0009] The output end of each filter corresponding to each coupler that generates each preset coupling signal is connected to the input end of the local oscillator driving circuit layer corresponding to the preset terahertz high frequency band signal that matches each preset coupling signal.

[0010] Optionally, the frequency multiplication chain integrated front end includes:

[0011] The first coupler input terminal is connected to the initial local oscillator frequency source;

[0012] The input end of each coupler stage except the first coupler is connected to the output end of the filter at the same stage and the output end of the coupler at the previous stage.

[0013] Optionally, the frequency multiplication chain integrated front end includes:

[0014] The output end of each coupler is connected to the input end of the filter at the same stage;

[0015] The output end of each coupler stage except the last coupler stage is connected to the input end of the next coupler stage.

[0016] A second aspect of the present application provides a terahertz broadband multi-band frequency doubling chain integration method, based on any terahertz broadband multi-band frequency doubling chain integration system described in the first aspect, comprising:

[0017] The initial local oscillator signal is transmitted to the multi-stage coupler in the frequency multiplication chain integrated front end to output a multi-band local oscillator signal group;

[0018] The multi-band local oscillator signal group is input into the frequency multiplication link of the corresponding frequency band for frequency multiplication to obtain multiple terahertz high-frequency band signals corresponding to the multi-band local oscillator signal group. The multiple terahertz high-frequency band signals constitute a frequency multiplication signal as the output signal corresponding to the initial local oscillator signal.

[0019] Optionally, the initial local oscillator signal is transmitted to a multi-stage coupler in the frequency multiplication chain integrated front end to output a multi-band local oscillator signal group, including:

[0020] The first coupler obtains the initial local oscillation signal output by the local oscillation frequency source and outputs a first coupled signal;

[0021] The first filter acquires the first coupled signal, outputs a local oscillator signal in a first frequency band, and transmits the local oscillator signal that does not belong to the first frequency band to the second coupler.

[0022] Optionally, after transmitting the local oscillator signal that does not belong to the first frequency band to the second coupler, the method includes:

[0023] The second coupler obtains the local oscillator signal that does not belong to the first frequency band and outputs a second coupled signal;

[0024] The second filter obtains the second coupled signal, outputs a local oscillator signal of a second frequency band, and transmits the local oscillator signal that does not belong to the second frequency band to the next-stage coupler and filter until the local oscillator signal of the last frequency band is output;

[0025] The local oscillator signal of each frequency band is used as the multi-frequency band local oscillator signal group.

[0026] Optionally, inputting the multi-band local oscillator signal group into a frequency multiplication link of a corresponding frequency band for frequency multiplication to obtain a plurality of terahertz high-frequency band signals corresponding to the multi-band local oscillator signal group includes:

[0027] Inputting the local oscillator signal of each frequency band in the multi-band local oscillator signal group into the corresponding local oscillator driving circuit layer to obtain a first-order frequency multiplication signal of each frequency band;

[0028] Inputting the first-order frequency-doubled signal of each frequency band into the corresponding broadband frequency multiplier to obtain a terahertz high-frequency band signal of each frequency band;

[0029] The terahertz high frequency band signal of each frequency band is output through the corresponding transmitting antenna.

[0030] Optionally, the multi-stage coupler is configured as follows:

[0031] Dividing the preset frequency-doubled signal into a plurality of preset terahertz high-frequency band signals, and determining a multi-level preset coupling signal corresponding to the plurality of preset terahertz high-frequency band signals according to the plurality of preset terahertz high-frequency band signals;

[0032] A multi-stage coupler is determined according to the multi-stage preset coupling signal, and each stage filter corresponding to each stage coupler is determined according to the multi-stage coupler.

[0033] Optionally, the primary local oscillator signal is generated as follows:

[0034] generating a plurality of preset initial local oscillation signals according to the multi-stage preset coupling signals;

[0035] The multiple segments of preset initial local oscillation signals are combined into a preset initial local oscillation signal, and an initial local oscillation frequency source is determined according to the range of the preset initial local oscillation signal. The initial local oscillation frequency source is used to generate the initial local oscillation signal.

[0036] Beneficial effects:

[0037] The embodiment of the present application provides a terahertz broadband multi-band frequency doubling chain integration system and method, including: a frequency doubling chain integration front end, the frequency doubling chain integration front end includes: an initial local oscillator frequency source, a multi-stage coupler and a multi-stage filter; wherein the multi-stage coupler and the multi-stage filter are connected correspondingly according to the number of stages; a frequency doubling chain group, the frequency doubling chain group includes: a plurality of local oscillator drive circuit layers corresponding to preset terahertz high-frequency band signals, a plurality of broadband frequency multipliers corresponding to preset terahertz high-frequency band signals and a plurality of transmitting antennas corresponding to preset terahertz high-frequency band signals; wherein the local oscillator drive circuit layers, the broadband frequency multipliers and the transmitting antennas corresponding to the same preset terahertz high-frequency band signals are connected in sequence. It has the following advantages:

[0038] (1) By combining multi-stage couplers and filters at the front end of the frequency doubling chain integration, one frequency source can drive multiple frequency doubling chains simultaneously, effectively reducing the volume of the front-end circuit, reducing the cost of the system, and improving the overall integration of the terahertz broadband multi-band frequency doubling chain system.

[0039] (2) By splitting the frequency doubling link group into multiple frequency doubling links of preset frequency bands, the preset bandwidth is effectively reduced, which can reduce the design difficulty of the frequency doubling link group when the waveguide port range is too large. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] Figure 1 This is a schematic diagram of a terahertz broadband multi-band frequency doubling chain integrated system proposed in one embodiment of the present application;

[0042] Figure 2 This is a flow chart of a terahertz broadband multi-band frequency doubling chain integration method proposed in one embodiment of the present application. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] In related technologies, the terahertz broadband multi-band frequency doubling chain is integrated into a simple parallel form. Each link is designed independently, and different frequency doubling links are driven by different frequency sources. Therefore, when used for signal transmission within the terahertz frequency band, the front-end circuit will be too large, the system cost will be too high, and it will be detrimental to the overall application of the system.

[0045] In view of this, the embodiment of the present application proposes a terahertz broadband multi-band frequency doubling chain integrated system. Figure 1 The schematic diagram of the terahertz broadband multi-band frequency doubling chain integrated system is shown in FIG. Figure 1 Shown, including:

[0046] A frequency multiplication chain integrated front end, comprising: an initial local oscillator frequency source, a multi-stage coupler, and a multi-stage filter; wherein the multi-stage coupler and the multi-stage filter are connected correspondingly according to the number of stages;

[0047] A frequency multiplication link group, the frequency multiplication link group includes: a plurality of local oscillator driving circuit layers corresponding to the preset terahertz high frequency band signals, a plurality of broadband frequency multipliers corresponding to the preset terahertz high frequency band signals, and a plurality of transmitting antennas corresponding to the preset terahertz high frequency band signals.

[0048] In a specific implementation, an initial local oscillator frequency source is used as the output end of the local oscillator signal. Since providing multiple separate local oscillator frequency sources to drive each frequency multiplication chain would result in an excessively large front-end for the system's frequency multiplication chain, high costs, and reduced frequency source utilization, the initial local oscillator frequency source in the embodiment of the present application is a single initial local oscillator frequency source that can cover the wide frequency band required by the system for local oscillator signals, and is determined according to a preset initial local oscillator signal.

[0049] It should be noted that in the embodiments of the present application, a conventional microwave frequency source is selected as the initial local oscillator frequency source. The specific initial local oscillator frequency source can be a single initial local oscillator frequency source that covers a wide frequency band and has a sufficiently high output power to simultaneously drive multiple frequency-multiplying links. This application does not impose any specific restrictions on this.

[0050] After determining the initial local oscillator frequency source with a preset initial local oscillator signal, the local oscillator frequency source needs to be split according to the multi-stage preset coupling signal to ensure that each frequency multiplication chain inputs the local oscillator signal of the corresponding frequency band. In specific implementation, a composite multi-stage coupler and multi-stage filter are set at the integrated front end of the frequency multiplication chain. The filter in the embodiment of the present application is a bandpass filter, which is used to transmit signals in the preset coupling signal frequency band to the frequency multiplication chain group, and reflect signals outside the preset coupling signal frequency band to the corresponding coupler for transmission to the next-stage coupler for processing.

[0051] First, the initial local oscillator frequency source is connected to the input of the first coupler in the multi-stage coupler. The input of each coupler stage, except the first, is connected to the output of the filter at the same stage and the output of the coupler at the previous stage. The output of each coupler stage is connected to the input of the filter at the same stage. The output of each coupler stage, except the last, is connected to the input of the coupler at the next stage.

[0052] For example, the input of the first coupler is connected to the initial local oscillator frequency source, and the output is connected to the first filter and the second coupler; the input of the second coupler is connected to the output of the first filter and the output of the second filter, and the output of the second coupler is connected to the input of the third coupler and the input of the second filter; the input of the nth coupler (the last coupler) is connected to the output of the n-1th coupler and the nth filter, and the output of the nth coupler is connected to the input of the nth filter. This ensures that the initial local oscillator signal input to the composite multi-stage couplers and multi-stage filters passes through each stage of the coupler and the corresponding filter in the connection order, and outputs a multi-stage coupled signal corresponding to the multi-stage preset coupled signal through each stage of the filter.

[0053] The embodiment of the present application conforms to the design of a multi-stage coupler and a multi-stage filter, so that the input initial local oscillator signal is distributed into multiple coupled signals through the multi-stage coupler, and the coupled signal output by each stage of the coupler is input into the corresponding bandpass filter. Under the action of the bandpass filter, the coupled signal that meets the frequency band range requirements is transmitted to the frequency doubling link, and the signal that does not meet the requirements is transmitted backward after being reflected by the filter, thereby realizing that the local oscillator signal generated by the same local oscillator frequency source is input into multiple frequency doubling links in frequency bands.

[0054] Each level of coupler in the above-mentioned frequency multiplication chain integrated front end is set according to the corresponding preset coupling signal, and the output end of each level of filter corresponding to each level of coupler that generates each level of preset coupling signal is connected to the input end of the local oscillator driving circuit layer corresponding to the preset terahertz high-frequency band signal that matches each level of preset coupling signal.

[0055] Each frequency multiplication link in a frequency multiplication link group is configured according to a different preset terahertz high-band signal. Each frequency multiplication link comprises a local oscillator drive circuit layer, a broadband frequency multiplier, and a transmitting antenna corresponding to the preset terahertz high-band signal range. The local oscillator drive circuit layer, the broadband frequency multiplier, and the transmitting antenna corresponding to the same preset terahertz high-band signal are connected in sequence, and each frequency multiplication link exists independently.

[0056] The second aspect of the present application provides a terahertz broadband multi-band frequency doubling chain integration method, based on the terahertz broadband multi-band frequency doubling chain integration system described in the first aspect, Figure 2The flow chart of the terahertz broadband multi-band frequency doubling chain integration method is shown in FIG. Figure 2 As shown, the following steps are included:

[0057] S101: Transmit the initial local oscillator signal to the multi-stage coupler in the frequency multiplication chain integrated front end to output a multi-band local oscillator signal group.

[0058] S102 : Inputting the multi-band local oscillator signal group into the frequency multiplication link of the corresponding frequency band for frequency multiplication to obtain a plurality of terahertz high frequency band signals corresponding to the multi-band local oscillator signal group as output signals corresponding to the initial local oscillator signal.

[0059] The multi-band local oscillator signal group is input into the frequency multiplication link of the corresponding frequency band for frequency multiplication to obtain multiple terahertz high-frequency band signals corresponding to the multi-band local oscillator signal group. The multiple terahertz high-frequency band signals constitute a frequency multiplication signal as the output signal corresponding to the initial local oscillator signal.

[0060] Before implementing step S101, it is necessary to determine the initial local oscillator frequency of the frequency multiplication chain integrated front end and the frequency band of the coupled signal corresponding to the multi-stage coupler. First, the preset frequency multiplication signal to be output by the system is obtained and divided into multiple preset terahertz high-frequency band signals.

[0061] It should be noted that the specific number of segments into which the preset terahertz high-frequency band signal is divided is determined by the specific system carrying capacity and the range of the preset frequency-multiplier signal. When the frequency band is low, the range of the preset frequency-multiplier signal is small, and one or a small number of broadband frequency multipliers can be used to achieve frequency band coverage of the waveguide port. In this case, a small number of segments of the preset terahertz high-frequency band signal can be set, reducing the system's carrying capacity while ensuring frequency band coverage. As the frequency band increases, the range of the preset frequency-multiplier signal becomes wider, making it difficult to achieve full frequency band coverage of the corresponding waveguide port with one or a small number of broadband frequency multipliers. Therefore, if the system carrying capacity allows, more segments of the preset terahertz high-frequency band signal are selected to reduce the preset bandwidth of each frequency-multiplier link, thereby reducing the system's design difficulty.

[0062] After determining multiple preset terahertz high-frequency band signals, multiple frequency multiplication chains corresponding to different preset terahertz high-frequency band signals are set according to the number of the preset terahertz high-frequency band signals to form a frequency multiplication chain group. Then, based on the multiple frequency multiplication chains corresponding to different preset terahertz high-frequency band signals, the signal range of the frequency multiplication chain integrated front end is determined.

[0063] According to the multiple preset terahertz high frequency band signals corresponding to the multiple frequency multiplication links, according to the preset frequency multiplication factor, a multi-level preset coupling signal is determined that can be multiplied a preset number of times according to the frequency multiplication factor to obtain multiple preset terahertz high frequency band signals, and the number of the preset coupling signals is the same as the number of the preset terahertz high frequency band signals. The preset frequency multiplication factor is used to specify the number of frequency multiplications for converting the coupling signal to the terahertz high frequency band signal. For example, if the preset frequency multiplication factor is set to eighteen times, it means that when the coupling signal is converted to the terahertz high frequency band signal through the corresponding frequency multiplication link, it needs to undergo eighteen times of frequency multiplication (the eighteen times of frequency multiplication is achieved by multiple double frequency multiplication circuits and triple frequency multiplication circuits in the frequency multiplication link). Then, by reducing the preset terahertz high frequency band signal of one frequency multiplication link by eighteen times, the preset coupling signal corresponding to the preset terahertz high frequency band signal can be obtained.

[0064] Then, the frequency band range corresponding to each stage coupler in the multi-stage coupler is determined according to the multi-stage preset coupling signal, and the bandpass filter corresponding to each stage coupler is determined according to the multi-stage coupler.

[0065] Finally, based on the preset coupling signal corresponding to each stage of the coupler, multiple segments of preset initial local oscillator signals are generated. By combining the ranges of these preset initial local oscillator signals, a range of the preset initial local oscillator signal is obtained. Based on the range of the preset initial local oscillator signal, an initial local oscillator frequency source is determined, and the initial local oscillator frequency source is used to generate an initial local oscillator signal within the range of the preset initial local oscillator signal.

[0066] At this point, the settings of the multi-stage coupler, multi-stage filter and initial local oscillator frequency source of the integrated front end of the terahertz broadband multi-band frequency doubling chain described in the embodiment of the present application are completed, so that the integrated front end of the frequency doubling chain generates local oscillator signals of different frequency bands that can be multiplied into multiple preset terahertz high-frequency band signals, and transmitted to the frequency doubling chain group for corresponding frequency doubling.

[0067] When step S101 is specifically implemented, the initial local oscillator frequency source sends an initial local oscillator signal that is identical to a preset initial local oscillator signal to the first coupler. The first coupler obtains the initial local oscillator signal output by the local oscillator frequency source and sends it to the first filter as a first coupling signal. Subsequently, the first filter obtains the first coupling signal and uses the first coupling signal that is within the first preset coupling signal range as the local oscillator signal of the first frequency band for transmission to a subsequent frequency doubling link group of a preset terahertz high frequency band signal corresponding to the first preset coupling signal.

[0068] At the same time, the first filter reflects the local oscillator signal that does not belong to the first frequency band and retransmits it back to the first coupler. The first coupler then sends this part of the local oscillator signal that does not belong to the first frequency band to the second coupler.

[0069] The second coupler obtains the local oscillator signal that does not belong to the first frequency band sent from the first coupler, and sends it to the second filter as a second coupling signal; then, the second filter obtains the second coupling signal, and uses the second coupling signal that is within the second preset coupling signal range as the local oscillator signal of the second frequency band for transmission to a subsequent frequency doubling link group of a preset terahertz high frequency band signal corresponding to the second preset coupling signal.

[0070] At the same time, the second filter reflects the local oscillator signal that does not belong to the second frequency band and retransmits it back to the second coupler. The second coupler then sends this part of the local oscillator signal that does not belong to the second frequency band to the third coupler.

[0071] As described above, the local oscillator signals corresponding to the frequency band are obtained in sequence, and the local oscillator signals that do not belong to the frequency band are reflected to the coupler of the current level through the filter of the current level, and then transmitted from the coupler of the current level to the coupler of the next level as the coupling signal of the next level, until the local oscillator signal of the last frequency band is output. The local oscillator signals of each frequency band are combined into a local oscillator signal group of multiple frequency bands. Through the design of the multi-stage coupler of the integrated front end and the multi-stage filter passing the signals of the corresponding frequency band and reflecting the signals that do not belong to the current frequency band, the initial local oscillator signal of an integrated local oscillator frequency source is split into local oscillator signals of different frequency bands and input into the frequency doubling chain group, thereby reducing the volume of the front-end local oscillator frequency source, achieving the purpose of one local oscillator frequency source driving multiple frequency doubling chains at the same time, and improving the overall integration of the terahertz broadband multi-band frequency doubling chain integrated system for spectral detection.

[0072] For example, by using the 110-170 GHz and 170-260 GHz frequency multipliers corresponding to the rectangular waveguide ports WR-6 and WR-4, the preset terahertz high-frequency band signals are a first high-frequency band frequency multiplication signal of 110-170 GHz and a second high-frequency band frequency multiplication signal of 170-260 GHz. The local oscillator frequency sources of the integrated front end corresponding to the frequency multiplication links of these two sets of preset terahertz high-frequency band signals can be integrated so that the two frequency multiplication links can be driven by the same initial local oscillator frequency source.

[0073] When step S102 is specifically implemented, first, based on the local oscillator signal of each frequency band in the obtained multi-band local oscillator signal group, a preset coupling signal of the integrated front-end coupler that generates the local oscillator signal of each frequency band is determined. Then, based on the correspondence between the preset coupling signal of each frequency band and the preset terahertz high-frequency band signal obtained when setting the frequency multiplication chain, the preset terahertz high-frequency band signal corresponding to the preset coupling signal of each frequency band and the corresponding frequency multiplication chain are determined, and used as the local oscillator signal of the corresponding frequency band for the output of the frequency multiplication chain.

[0074] The local oscillator signal of each frequency band in the multi-band local oscillator signal group is input into the local oscillator drive circuit layer of the corresponding frequency multiplication chain determined above, where cascade frequency multiplication and amplification of the signal are performed to obtain a first-order frequency multiplication signal for each frequency band corresponding to the local oscillator signal of each frequency band. The first-order frequency multiplication signal is the signal before cascade frequency multiplication by the broadband frequency multiplier. The first-order frequency multiplication signal of each frequency band is then input into the corresponding broadband frequency multiplier for subsequent cascade frequency multiplication to obtain a terahertz high-frequency band signal for each frequency band. Finally, the terahertz high-frequency band signal of each frequency band is transmitted to the corresponding transmitting antenna, and the target terahertz high-frequency band signal is radiated and outputted via the corresponding transmitting antenna.

[0075] It should be noted that the above-mentioned local oscillator driving circuit layer performs multi-stage cascade frequency multiplication and amplification based on the frequency multiplication factor according to the frequency band gap between the preset coupling signal and the corresponding preset terahertz high-frequency band signal, that is, power amplification can be performed through multiple double frequency multiplication, triple frequency multiplication and amplifier. The specific multiple cascade frequency multiplication form can be determined based on the cost and the actual situation of the frequency multiplication link, and this application does not make specific restrictions here; the above-mentioned broadband frequency multiplier performs cascade frequency multiplication and amplification of the signal based on the frequency multiplication factor according to the frequency band gap between the first-level frequency multiplication signal and the preset terahertz high-frequency band signal. The specific number and form of cascade frequency multiplication performed by the broadband frequency multiplier can be determined based on the cost and the actual situation of the frequency multiplication link, and this application does not make specific restrictions here.

[0076] In order to enable those skilled in the art to understand the present application more clearly, the terahertz broadband multi-band frequency doubling chain integration method described in the present application is now described in detail through the following examples.

[0077] Example 1

[0078] When designing a terahertz spectroscopy detection system covering an ultra-wideband, this technical solution can reduce the demand for front-end frequency sources, lower the design requirements for high-frequency broadband frequency multipliers, and improve the overall integration of the system.

[0079] First, multiple preset high-frequency multiplier signals for radiation are determined. In this embodiment, a rectangular waveguide port WR-2.8 is used, and its corresponding preset frequency band is 260-400 GHz. 260-400 GHz is divided as the preset multiplier signals.

[0080] In this embodiment, the preset frequency-multiplication signal is divided into two preset terahertz high-frequency band signals, 260-330 GHz and 330-400 GHz. A first frequency-multiplication link is determined for obtaining a first terahertz high-frequency band signal, 260-330 GHz, identical to the first preset terahertz high-frequency band signal, and a second frequency-multiplication link is determined for obtaining a second terahertz high-frequency band signal, 330-400 GHz, identical to the second preset terahertz high-frequency band signal. The first frequency-multiplication link and the second frequency-multiplication link are combined into a frequency-multiplication link group.

[0081] Subsequently, a first preset coupling signal is determined based on the first preset terahertz high-frequency band signal (260-330 GHz), and a second preset coupling signal is determined based on the second preset terahertz high-frequency band signal (330-400 GHz). Specifically, based on the preset frequency multiplication factor, the first preset coupling signal is determined to be 21.66-27.5 GHz, and the second preset coupling signal is determined to be 27.5-33.33 GHz. A first coupler and a first filter are determined based on the first preset coupling signal, and a second coupler and a second filter are determined based on the second preset coupling signal.

[0082] Then, the first preset coupling signal and the second preset coupling signal are combined to obtain a preset initial local oscillator signal in the range of 21.66-33.33 GHz. According to the range of the preset initial local oscillator signal, an initial local oscillator signal source is determined for generating an initial local oscillator signal with the same range as the preset initial local oscillator signal.

[0083] After the multi-stage coupler, multi-stage filter, initial local oscillator frequency source, and frequency doubling link group of the integrated front end of the terahertz broadband multi-band frequency doubling chain are set, step S101 is executed. The initial local oscillator frequency source transmits the initial local oscillator signal of 21.66-33.33 GHz to the first coupler. The first coupler processes the initial local oscillator signal into a first coupled signal and transmits it to the first filter. The first filter uses the signal belonging to the preset first preset coupled signal 21.66-27.5 GHz as the local oscillator signal of the first frequency band and outputs it to the first frequency doubling link. The signal that does not belong to 21.66-27.5 GHz is reflected to the first coupler. The first coupler transmits this part of the signal that does not belong to 21.66-27.5 GHz to the second coupler.

[0084] The second coupler receives this part of the signal that does not belong to 21.66-27.5GHz, processes it into a second coupled signal and transmits it to the second filter. The second filter uses the signal belonging to the second preset coupled signal 27.5-33.33GHz as the local oscillator signal of the second frequency band and outputs it to the second frequency multiplication link.

[0085] Then, step S102 is executed, and the local oscillator driving circuit layer of the first frequency doubling link receives the local oscillator signal of the first frequency band and performs frequency doubling to obtain a first-level frequency doubling signal. The first-level frequency doubling signal is sent to a subsequent broadband frequency multiplier for frequency doubling to obtain a first terahertz high-frequency band signal 260-330 GHz corresponding to the first preset terahertz high-frequency band signal, and the first terahertz high-frequency band signal is radiated and outputted via the transmitting antenna.

[0086] At the same time, the local oscillator drive circuit layer of the second frequency multiplication link receives the local oscillator signal in the second frequency band and multiplies it to produce a first-order frequency multiplication signal. This first-order frequency multiplication signal is then sent to a subsequent broadband frequency multiplier for further multiplication, producing a second terahertz high-frequency band signal (330-400 GHz) corresponding to the second preset terahertz high-frequency band signal. This second terahertz high-frequency band signal is then radiated and output via the transmitting antenna. By radiating the first and second terahertz high-frequency band signals, the overall 260-400 GHz signal output is completed.

[0087] The present invention provides a method for integrating a terahertz broadband multi-band frequency doubling chain, including: transmitting an initial local oscillator signal to a multi-stage coupler in the frequency doubling chain integration front end to output a multi-band local oscillator signal group; inputting the multi-band local oscillator signal group into a frequency doubling chain of a corresponding frequency band for frequency doubling, thereby obtaining multiple terahertz high-frequency band signals corresponding to the multi-band local oscillator signal group; the multiple terahertz high-frequency band signals constitute a frequency doubling signal as the output signal corresponding to the initial local oscillator signal. This method has the following advantages:

[0088] (1) By combining multi-stage couplers and filters at the front end of the frequency doubling chain integration, one frequency source can drive multiple frequency doubling chains simultaneously, effectively reducing the volume of the front-end circuit, reducing the cost of the system, and improving the overall integration of the terahertz broadband multi-band frequency doubling chain system.

[0089] (2) By splitting the frequency doubling link group into multiple frequency doubling links of preset frequency bands, the preset bandwidth is effectively reduced, which can reduce the design difficulty of the frequency doubling link group when the waveguide port range is too large.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, apparatuses, electronic devices, and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as the combination of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0092] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0093] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0094] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0095] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements that are inherent to such process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0096] The above is a detailed introduction to the terahertz broadband multi-band frequency doubling chain integrated system and method provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A terahertz broadband multi-band frequency multiplication chain integrated system, characterized in that: include: A frequency multiplication chain integrated front end, the frequency multiplication chain integrated front end comprising: an initial local oscillator frequency source, a multi-stage coupler and a multi-stage filter; wherein the multi-stage coupler and the multi-stage filter are connected correspondingly according to the number of stages, the input end of the first coupler is connected to the initial local oscillator frequency source, and the input end of each stage coupler except the first coupler is connected to the output end of the filter at the same stage and the output end of the coupler at the previous stage; the multi-stage coupler is used to distribute the input initial local oscillator signal into multiple coupled signals, and the coupled signal output by each stage coupler is input into the corresponding bandpass filter; the bandpass filter is used to transmit the coupled signal that meets the frequency band range requirements to the frequency multiplication chain, and the signal that does not meet the requirements is transmitted backward after being reflected by the filter, so as to realize that the initial local oscillator signal generated by the same local oscillator frequency source is input into multiple frequency multiplication chains in frequency bands; A frequency multiplication link group, the frequency multiplication link group comprising: a plurality of local oscillator driving circuit layers corresponding to preset terahertz high-frequency band signals, a plurality of broadband frequency multipliers corresponding to preset terahertz high-frequency band signals, and a plurality of transmitting antennas corresponding to preset terahertz high-frequency band signals; wherein the local oscillator driving circuit layers, the broadband frequency multipliers, and the transmitting antennas corresponding to the same preset terahertz high-frequency band signals are connected in sequence.

2. The terahertz broadband multi-band frequency doubling chain integrated system according to claim 1, characterized in that: The frequency multiplication chain integrated front end and the frequency multiplication chain group are connected in the following manner: The output end of each filter corresponding to each coupler that generates each preset coupling signal is connected to the input end of the local oscillator driving circuit layer corresponding to the preset terahertz high frequency band signal that matches each preset coupling signal.

3. The terahertz broadband multi-band frequency doubling chain integrated system according to claim 1, characterized in that: The frequency multiplication chain integrated front end includes: The output end of each coupler is connected to the input end of the filter at the same stage; The output end of each coupler stage except the last coupler stage is connected to the input end of the next coupler stage.

4. A terahertz broadband multi-band frequency doubling chain integration method, based on the terahertz broadband multi-band frequency doubling chain integration system according to any one of claims 1 to 3, characterized in that: include: The initial local oscillator signal is transmitted to the multi-stage coupler in the frequency multiplication chain integrated front end, and a multi-band local oscillator signal group is output; the multi-stage coupler is used to distribute the input initial local oscillator signal into multiple coupled signals, and the coupled signal output by each stage coupler is input into the corresponding bandpass filter; The bandpass filter is used to transmit the coupled signal that meets the frequency band range requirements to the frequency doubling link, and the signal that does not meet the requirements is reflected by the filter and transmitted backward, so as to realize the initial local oscillator signal generated by the same local oscillator frequency source to be input into multiple frequency doubling links in frequency bands; The multi-band local oscillator signal group is input into the frequency multiplication link of the corresponding frequency band for frequency multiplication to obtain multiple terahertz high-frequency band signals corresponding to the multi-band local oscillator signal group. The multiple terahertz high-frequency band signals constitute a frequency multiplication signal as the output signal corresponding to the initial local oscillator signal.

5. The terahertz broadband multi-band frequency doubling chain integration method according to claim 4, characterized in that: The initial local oscillator signal is transmitted to the multi-stage coupler in the frequency multiplication chain integrated front end, outputting a multi-band local oscillator signal group, including: The first coupler obtains the initial local oscillation signal output by the local oscillation frequency source and outputs a first coupled signal; The first filter acquires the first coupled signal, outputs a local oscillator signal in a first frequency band, and transmits the local oscillator signal that does not belong to the first frequency band to the second coupler.

6. The terahertz broadband multi-band frequency doubling chain integration method according to claim 4, characterized in that: After transmitting the local oscillator signal that does not belong to the first frequency band to the second coupler, the method includes: The second coupler obtains the local oscillator signal that does not belong to the first frequency band and outputs a second coupled signal; The second filter obtains the second coupled signal, outputs a local oscillator signal of a second frequency band, and transmits the local oscillator signal that does not belong to the second frequency band to the next-stage coupler and filter until the local oscillator signal of the last frequency band is output; The local oscillator signal of each frequency band is used as the multi-frequency band local oscillator signal group.

7. The terahertz broadband multi-band frequency doubling chain integration method according to claim 4, characterized in that: Inputting the multi-band local oscillator signal group into a frequency multiplication link of a corresponding frequency band for frequency multiplication to obtain a plurality of terahertz high frequency band signals corresponding to the multi-band local oscillator signal group, including: Inputting the local oscillator signal of each frequency band in the multi-band local oscillator signal group into the corresponding local oscillator driving circuit layer to obtain a first-order frequency multiplication signal of each frequency band; Inputting the first-order frequency-doubled signal of each frequency band into the corresponding broadband frequency multiplier to obtain a terahertz high-frequency band signal of each frequency band; The terahertz high frequency band signal of each frequency band is output through the corresponding transmitting antenna.

8. The terahertz broadband multi-band frequency doubling chain integration method according to claim 4, characterized in that: The multi-stage coupler is configured as follows: Dividing the preset frequency-doubled signal into a plurality of preset terahertz high-frequency band signals, and determining a multi-level preset coupling signal corresponding to the plurality of preset terahertz high-frequency band signals according to the plurality of preset terahertz high-frequency band signals; A multi-stage coupler is determined according to the multi-stage preset coupling signal, and each stage filter corresponding to each stage coupler is determined according to the multi-stage coupler.

9. The terahertz broadband multi-band frequency doubling chain integration method according to claim 8, characterized in that: The initial local oscillator signal is generated as follows: generating a plurality of preset initial local oscillation signals according to the multi-stage preset coupling signals; The multiple segments of preset initial local oscillation signals are combined into a preset initial local oscillation signal, and an initial local oscillation frequency source is determined according to the range of the preset initial local oscillation signal. The initial local oscillation frequency source is used to generate the initial local oscillation signal.

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