6G-based sub-terahertz test system and test method

Abstract

The invention discloses a test system and method based on 6G sub-terahertz, and the system comprises a transmitting channel and a receiving channel, and each of the transmitting channel and the receiving channel comprises a vector signal transceiver, a band-pass filter, a low-noise amplifier, and a frequency multiplier. The transmitting channel further comprises an up-converter and a transmitting antenna; and the vector signal transceiver in the transmitting channel is electrically connected with the up-converter, the band-pass filter, the low-noise amplifier and the transmitting antenna in sequence. According to the invention, an analog signal generator and a vector signal receiver are integrated, a high-performance FPGA co-processing module, an up-down converter and other hardware modules are additionally arranged, a test system is formed in a Sub-THz frequency band and a D wave band, the communication frequency is improved, the bandwidth is increased, the application of sub-THz waves in 6G communication is verified and optimized, and the application prospect is wide. And the sub-terahertz waves can be efficiently measured, tested and verified, and key technical support is provided for research, development and deployment of a 6G communication system.

Description

Technical Field

[0001] The present invention relates to the field of 6G communication and sub-terahertz technology, and in particular to a 6G sub-terahertz test system and a test method. Background Art

[0002] With the rapid development of communication technology, the sixth generation of mobile communication (6G) technology is gradually becoming a hot spot for research and application. At present, communication technology mainly focuses on the frequency band below 100GHz, while 6G communication technology, with its advanced vision, is committed to breaking through this boundary. By increasing the communication frequency, it aims to bring users higher data transmission rates, lower latency and wider connections, redefining the boundaries of future communications.

[0003] The sub-terahertz band is located between the millimeter wave and terahertz bands, and has a wider spectrum bandwidth and higher frequency resource utilization, and is considered to be one of the key bands for achieving 6G ultra-high-speed, low-latency, and high-capacity communications. However, the high-frequency characteristics of sub-terahertz band signals make the signal transmission, reception, amplification, filtering and other processing processes particularly complex, and traditional signal processing technologies often find it difficult to achieve ideal performance in this frequency band.

[0004] Therefore, it is necessary to develop new hardware equipment and test systems to adapt to the characteristics of the sub-terahertz frequency band in order to solve the above problems. Summary of the invention

[0005] The present invention overcomes the deficiencies of the prior art and provides a 6G sub-terahertz test system and a test method.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a 6G sub-terahertz test system, comprising: a transmitting channel and a receiving channel, wherein the transmitting channel and the receiving channel both comprise: a vector signal transceiver, a bandpass filter, a low noise amplifier and a frequency multiplier;

[0007] The transmitting channel further includes: an up-converter and a transmitting antenna; the vector signal transceiver in the transmitting channel is electrically connected to the up-converter, the band-pass filter, the low-noise amplifier and the transmitting antenna in sequence;

[0008] The receiving channel further includes: a down converter and a receiving antenna; the vector signal transceiver in the receiving channel is electrically connected to the down converter, the bandpass filter, the low noise amplifier and the receiving antenna in sequence;

[0009] The test system also includes: an analog signal generator and a power divider electrically connected in sequence; the power divider is electrically connected to the frequency multiplier and the up-converter in sequence in the transmitting channel, and the power divider is electrically connected to the frequency multiplier and the down-converter in sequence in the receiving channel.

[0010] In a preferred embodiment of the present invention, the vector signal transceiver is used for transmitting and receiving intermediate frequency signals, the output frequency band range is 8.5-13.5 GHz, and the maximum input power is -10 dBm.

[0011] In a preferred embodiment of the present invention, the RF frequency range of the up-converter is 155-165 GHz, the maximum saturated power of the RF output is >-3dBm, the RF output image suppression is >30dBc, the RF output local oscillator suppression is >10dBc, and the total gain of the up-conversion system is >9dB.

[0012] In a preferred embodiment of the present invention, the RF frequency range of the down-converter is 155-165 GHz, the maximum input power of the RF output is -20 dBm, the RF output image suppression is >30 dBc, and the total gain of the up-conversion system is >50 dB.

[0013] In a preferred embodiment of the present invention, the passband of the bandpass filter is 155-165 GHz, the stopband is 133-151.5 GHz, and the stopband suppression can reach greater than 20 dBc at 151.5 GHz and greater than 30 dBc at 146.5 GHz.

[0014] In a preferred embodiment of the present invention, the analog signal generator is used as a signal source to output a local oscillator low-frequency signal, and the output frequency band ranges from 12 to 13 GHz.

[0015] In a preferred embodiment of the present invention, the saturated output power of the low noise amplifier is >-3dBm, the gain is >18dB, and the typical value of the noise figure is preferably 8dB.

[0016] In a preferred embodiment of the present invention, the frequency multiplier is used to make the output signal frequency equal to an integer multiple of the input signal frequency, and the frequency multiplication times of the frequency multiplier is preferably 12 times.

[0017] The present invention provides a testing method based on a 6G sub-terahertz testing system, comprising the following steps:

[0018] S1, the analog signal generator outputs a 12-13GHz local oscillator low-frequency signal, which is divided into two paths by the power divider, and then passes through the frequency multipliers of the transmitting channel and the receiving channel respectively, and after 12 times of frequency multiplication, a 146.5-151.5GHz local oscillator signal is formed;

[0019] S2, the transmitting end of the vector signal transceiver in the transmitting channel outputs an intermediate frequency signal of 8.5-13.5 GHz, which is mixed with the local oscillator signal obtained in step S1 by an up-converter to form a radio frequency signal of 155-165 GHz, and a certain gigahertz image frequency signal is filtered out by a band-pass filter, and the radio frequency signal is outputted through a low noise amplifier and a transmitting antenna in sequence;

[0020] S3. The receiving antenna in the receiving channel receives the RF signal output in step S2. After passing through the low-noise amplifier, the image frequency signal is filtered out by a bandpass filter, and mixed with the local oscillator signal obtained in step S1 through a down-converter to form an intermediate frequency signal, which is output to the receiving end of the vector signal transceiver to complete the test.

[0021] In a preferred embodiment of the present invention, in step S2, the bandpass filter filters out image frequency signals of 133-143 GHz and suppresses them by 30 dBc.

[0022] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0023] (1) The present invention provides a 6G sub-THz test system and test method. On the basis of 5G communication, an analog signal generator and a vector signal receiver are integrated, and high-performance FPGA co-processing modules and up-down converters and other hardware modules are added. A test system integrating calibration, measurement and signal streaming is formed in the Sub-THz band and the D band, which increases the communication frequency and bandwidth, verifies and optimizes the application of sub-THz waves in 6G communication, and can efficiently measure, test and verify sub-THz waves, providing key technical support for the research and development and deployment of 6G communication systems.

[0024] (2) In the present invention, by using a vector signal transceiver, an analog signal generator, and an up-down converter, it is possible to achieve wideband communication with a theoretical bandwidth of 5 GHz, which can carry a larger amount of information and achieve an extremely high data transmission rate.

[0025] (3) In the present invention, the gain of the entire receiving link is about 59 dB, the output signal is about -3 dBm, and the receiving sensitivity is high, thereby being able to meet the minimum power requirement of the receiver.

[0026] (4) In the present invention, the saturation power of the transmitting channel of the test system is -3dBm. Under the QPSK modulation mode, the output power can reach -6dBm. When the gain of the transmitting and receiving antennas is 25dBi, the loss is about 46dB at a length of 10m. Therefore, at a distance of 10m, the direct path test can be completed, thereby maintaining a relatively long communication distance in the high frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural diagram of a 6G sub-terahertz test system based on the present invention;

[0029] In the figure: 1. Transmitting channel; 11. Up converter; 12. Transmitting antenna; 2. Receiving channel; 21. Down converter; 22. Receiving antenna; 3. Vector signal transceiver; 4. Bandpass filter; 5. Low noise amplifier; 6. Frequency multiplier; 7. Analog signal generator; 8. Power divider. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0034] like Figure 1 As shown, a 6G sub-terahertz test system includes: a transmitting channel 1 and a receiving channel 2, both of which include: a vector signal transceiver 3, a bandpass filter 4, a low noise amplifier 5 and a frequency multiplier 6; the transmitting channel 1 also includes: an up converter 11 and a transmitting antenna 12; the vector signal transceiver 3 in the transmitting channel 1 is electrically connected to the up converter 11, the bandpass filter 4, the low noise amplifier 5 and the transmitting antenna 12 in sequence; the receiving channel 2 also includes: a down converter 21 and a receiving antenna 22; the vector signal transceiver 3 in the receiving channel 2 is electrically connected to the down converter 21, the bandpass filter 4, the low noise amplifier 5 and the receiving antenna 22 in sequence; the test system also includes: an analog signal generator 7 and a power divider 8 electrically connected in sequence; the power divider 8 is electrically connected to the frequency multiplier 6 and the up converter 11 in the transmitting channel 1 in sequence, and the power divider 8 is electrically connected to the frequency multiplier 6 and the down converter 21 in the receiving channel 2 in sequence.

[0035] It should be noted that the transmitting channel 1 and the receiving channel 2 are the core parts of the test system, which are used for sending and receiving signals. The transmitting channel 1 converts the intermediate frequency signal into a high frequency signal and sends it out through the transmitting antenna 12; the receiving channel 2 receives the high frequency signal from the outside and converts it into an intermediate frequency signal for processing, ensuring the stability and accuracy of the signal during the transmission process.

[0036] In some specific embodiments, the vector signal transceiver 3 is used to transmit and receive intermediate frequency signals, and the output frequency band range is 8.5-13.5 GHz, and the maximum input power is -10 dBm; the analog signal generator 7 is used as a signal source to output the local oscillator low-frequency signal, and the output frequency band range is 12-13 GHz; the RF frequency range of the up-converter 11 is 155-165 GHz, the maximum saturated RF output power is >-3dBm, the RF output image suppression is >30dBc, the RF output local oscillator suppression is >10dBc, and the total gain of the up-conversion system is >9dB; the RF frequency range of the down-converter 21 is 155-165 GHz, the maximum input RF power is -20dBm, the RF output image suppression is >30dBc, and the total gain of the up-conversion system is >50dB.

[0037] It should be noted that the model of the vector signal transceiver 3 is preferably PXIe-5842, and the model of the analog signal generator 7 is preferably PXIe-5654; ​​the frequency band range of the vector signal transceiver 3 output covers 8.5-13.5GHz. In order to cooperate with the subsequent up-converter 11 or down-converter 21 to achieve signal frequency conversion, the maximum input power is limited to -10dBm to protect the equipment from damage by excessive signals; the analog signal generator 7 serves as a signal source and outputs a local oscillator low-frequency signal with a frequency band range of 12-13GHz. In order to cooperate with the frequency multiplier 6, Generate a higher frequency signal; the up-converter 11 converts the intermediate frequency signal into an RF signal, and its RF frequency range is 155-165GHz. Indicators such as the maximum saturated power of the RF output, image suppression and local oscillator suppression ensure the purity and stability of the signal; the down-converter 21 converts the RF signal into an intermediate frequency signal, and its RF frequency range is also 155-165GHz, which matches the up-converter 11. The maximum input power of the RF output is limited to -20dBm to protect the equipment. Indicators such as the RF output image suppression and the total gain of the up-conversion system ensure the accurate conversion and reception of the signal.

[0038] The present invention, by adopting a vector signal transceiver 3, an analog signal generator 7 and an up-down converter 21, can realize wideband communication with a theoretical bandwidth of 5 GHz (the maximum bandwidth in actual operation is 2 GHz, and the maximum debugging mode is 16QAM), can carry a larger amount of information, and achieve an extremely high data transmission rate.

[0039] In some specific embodiments, the passband of the bandpass filter 4 is 155-165 GHz, and the stopband is 133-151.5 GHz. The stopband suppression can reach greater than 20 dBc at 151.5 GHz and greater than 30 dBc at 146.5 GHz. The bandpass filter 4 is used to filter out signals outside a specific frequency band, and its passband is 155-165 GHz. In order to allow signals in this frequency band to pass, the stopband is 133-151.5 GHz. In order to filter out interference signals in these frequency bands, the stopband suppression index ensures that the interference signals are effectively suppressed.

[0040] In some specific implementations, the saturated output power of the low noise amplifier 5 is greater than -3dBm, the gain is greater than 18dB, and the typical value of the noise coefficient is preferably 8dB; the low noise amplifier 5 is used to amplify weak signals while maintaining the purity of the signal. Its saturated output power and gain indicators ensure that the signal will not be distorted or damaged during the amplification process, and the typical value of the noise coefficient is 8dB, which means that the low noise amplifier 5 introduces relatively small noise while amplifying the signal.

[0041] In some specific implementations, the frequency multiplier 6 is used to make the output signal frequency equal to an integer multiple of the input signal frequency, and the frequency multiplication number of the frequency multiplier 6 is preferably 12 times; a higher frequency signal is generated by the frequency multiplier 6 to meet the requirements of the 6G sub-terahertz test system.

[0042] Example

[0043] A testing method based on a 6G sub-terahertz testing system comprises the following steps:

[0044] S1, analog signal generator 7 outputs 12-13GHz local oscillator low-frequency signal, which is divided into two paths by power divider 8, and then passes through frequency multiplier 6 of transmitting channel 1 and receiving channel 2 respectively, and after 12 times of frequency multiplication, forms a local oscillator signal of 146.5-151.5GHz;

[0045] S2, the transmitting end of the vector signal transceiver 3 in the transmitting channel 1 outputs an intermediate frequency signal of 8.5-13.5 GHz, which is mixed with the local oscillator signal obtained in step S1 by the up-converter 11 to form a radio frequency signal of 155-165 GHz, and a certain gigahertz image frequency signal is filtered out by the bandpass filter 4, and the radio frequency signal is outputted through the low noise amplifier 5 and the transmitting antenna 12 in sequence;

[0046] S3, the receiving antenna 22 in the receiving channel 2 receives the RF signal output in step S2, passes through the low noise amplifier 5, filters out the image frequency signal through the bandpass filter 4, and mixes it with the local oscillator signal obtained in step S1 through the down converter 21 to form an intermediate frequency signal, which is output to the receiving end of the vector signal transceiver 3 to complete the test.

[0047] Among them, after the output of the bandpass filter 4, it passes through the LNA (low noise amplifier 5) and the transmitting antenna 12 to output the RF signal. The saturated output power of the LNA is>-3dBm. Since the modulated signal is actually used, considering the peak-to-average ratio and linearity regression, the final output power is -10dBm@16QAM.

[0048] -6dBm@QPSK.

[0049] It should be noted that, at a bandwidth of 2GHz, the tested noise floor is -174dBm / Hz+93dB (converted to 2GHz bandwidth)+9dB (noise coefficient)=-72dBm. If the demodulation of BPSK (binary phase shift keying) and QPSK (quadrature phase shift keying) signals is guaranteed, considering that the phase noise in the 160GHz frequency band is poor, a demodulation signal-to-noise ratio of 10dB is reserved. Therefore, the power of the input signal must reach at least -62dBm, the gain of the entire receiving link is approximately 59dB, and the output signal is approximately -3dBm. The receiving sensitivity is high, thus being able to meet the minimum power requirement of the receiver.

[0050] In some specific implementations, in step S2, the bandpass filter 4 filters out the image frequency signal of 133-143 GHz, and the suppression reaches 30 dBc.

[0051] It should be noted that after the intermediate frequency signal and the local oscillator signal are mixed by the up-converter 11, since the intermediate frequency signal is as low as 8.5 GHz, in the output signal of the up-converter 11, the interval between the useful signal and the image frequency signal is 17 GHz. Therefore, a bandpass filter 4 with a passband of 155-165 GHz is connected after the up-converter 11 to filter out the image frequency signal of 133-143 GHz; since the local oscillator signal output is 146.5-151.5 GHz, the local oscillator suppression is relatively small in the high frequency band of the local oscillator. When the local oscillator is sensitive to leakage, the high intermediate frequency and low radio frequency can be used to solve the problem.

[0052] In the present invention, since the saturation power of the transmission channel 1 is -3dBm, the output power can reach -6dBm in the QPSK modulation mode. In order to predict the performance indicators such as coverage, transmission rate and stability of the system under different conditions, the spatial loss and the loss with the receiving and transmitting antenna gain are calculated: L = 20log (d) + 20log (f) + 32.45; wherein L is the spatial loss; d is the distance; f is the frequency; P = L-(x i +y i ), where P is the loss with the transmit and receive antenna gain; x i is the gain of the receiving antenna 22; i is the gain of the transmitting antenna 12; the loss of the transmitting and receiving antennas is shown in Table 1.

[0053] Table 1: Transmitter and receiver antenna losses

[0054]

[0055] It can be seen from Table 1 that in the 160GHz frequency band, as the distance increases, the spatial loss gradually increases, resulting in a gradual increase in the loss of the transceiver antenna gain. At the same frequency band and distance, the higher the antenna gain, the smaller the loss of the transceiver antenna gain, that is, the higher the signal transmission efficiency; when the transceiver antenna gain is 25dBi, at a length of 10m, the loss is about 46dB, so the received signal level is -52dBm, which is about the minimum demodulation sensitivity requirement of -62dBm, and there is a 10dB margin for multipath testing. Therefore, at a distance of 10m, a direct path test can be performed.

[0056] Based on 5G communication, the present invention integrates an analog signal generator 7 and a vector signal receiver 3, plus a high-performance FPGA (programmable gate array) co-processing module and hardware modules such as up and down converters, and forms a test system integrating calibration, measurement and signal streaming in the Sub-THz band and the D band, thereby increasing the communication frequency and bandwidth, verifying and optimizing the application of sub-THz waves in 6G communication, and being able to efficiently measure, test and verify sub-THz waves, providing key technical support for the research and development and deployment of 6G communication systems.

[0057] Finally, it should be noted that the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article, or apparatus.

[0058] The above is based on the ideal embodiment of the present invention. Through the above description, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A 6G sub-terahertz test system, comprising: The transmitting channel and the receiving channel are characterized in that: the transmitting channel and the receiving channel both include: a vector signal transceiver, a bandpass filter, a low noise amplifier and a frequency multiplier; The transmitting channel further includes: an up-converter and a transmitting antenna; the vector signal transceiver in the transmitting channel is electrically connected to the up-converter, the band-pass filter, the low-noise amplifier and the transmitting antenna in sequence; The receiving channel further includes: a down converter and a receiving antenna; the vector signal transceiver in the receiving channel is electrically connected to the down converter, the bandpass filter, the low noise amplifier and the receiving antenna in sequence; The test system also includes: an analog signal generator and a power divider electrically connected in sequence; the power divider is electrically connected to the frequency multiplier and the up-converter in sequence in the transmitting channel, and the power divider is electrically connected to the frequency multiplier and the down-converter in sequence in the receiving channel.

2. A 6G sub-terahertz test system according to claim 1, characterized in that: The vector signal transceiver is used for transmitting and receiving intermediate frequency signals, and the output frequency band range is 8.5-13.5GHz, and the maximum input power is -10dBm.

3. The 6G sub-terahertz test system according to claim 1, characterized in that: The RF frequency range of the up-converter is 155-165 GHz, the maximum saturated power of the RF output is >-3dBm, the image suppression of the RF output is >30dBc, the local oscillator suppression of the RF output is >10dBc, and the total gain of the up-conversion system is >9dB.

4. The 6G sub-terahertz test system according to claim 1, characterized in that: The RF frequency range of the down-converter is 155-165 GHz, the maximum input power of the RF output is -20 dBm, the RF output image suppression is greater than 30 dBc, and the total gain of the up-conversion system is greater than 50 dB.

5. The 6G sub-terahertz test system according to claim 1, characterized in that: The passband of the bandpass filter is 155-165 GHz, the stopband is 133-151.5 GHz, and the stopband suppression can reach greater than 20 dBc at 151.5 GHz and greater than 30 dBc at 146.5 GHz.

6. The 6G sub-terahertz test system according to claim 1, characterized in that: The analog signal generator is used as a signal source to output a local oscillator low-frequency signal, and the output frequency band range is 12-13 GHz.

7. The 6G sub-terahertz test system according to claim 1, characterized in that: The saturated output power of the low noise amplifier is >-3dBm, the gain is >18dB, and the typical value of the noise figure is preferably 8dB.

8. The 6G sub-terahertz test system according to claim 1, characterized in that: The frequency multiplier is used to make the output signal frequency equal to an integer multiple of the input signal frequency, and the frequency multiplication times of the frequency multiplier is preferably 12 times.

9. A test method based on a 6G sub-terahertz test system according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, the analog signal generator outputs a 12-13GHz local oscillator low-frequency signal, which is divided into two paths by the power divider, and then passes through the frequency multipliers of the transmitting channel and the receiving channel respectively, and after 12 times of frequency multiplication, a 146.5-151.5GHz local oscillator signal is formed; S2, the transmitting end of the vector signal transceiver in the transmitting channel outputs an intermediate frequency signal of 8.5-13.5 GHz, which is mixed with the local oscillator signal obtained in step S1 by an up-converter to form a radio frequency signal of 155-165 GHz, and a certain gigahertz image frequency signal is filtered out by a band-pass filter, and the radio frequency signal is outputted through a low noise amplifier and a transmitting antenna in sequence; S3. The receiving antenna in the receiving channel receives the RF signal output in step S2. After passing through the low-noise amplifier, the image frequency signal is filtered out by a bandpass filter, and mixed with the local oscillator signal obtained in step S1 through a down-converter to form an intermediate frequency signal, which is output to the receiving end of the vector signal transceiver to complete the test.

10. A test method based on a 6G sub-terahertz test system according to claim 9, characterized in that: In step S2, the bandpass filter filters out image frequency signals of 133-143 GHz, and the suppression reaches 30 dBc.

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