A measurement frequency band expansion method and device based on a vector network analyzer

Abstract

The present invention discloses a method for expanding the measurement frequency band based on a vector network analyzer, including: the original measurement signal is converted into a high-frequency measurement signal by a first frequency conversion module and output to the device under test, and the high-frequency measurement signal is restored to the original measurement signal by a third frequency conversion module and the original measurement signal is transmitted to a first reference receiver, the high-frequency measurement signal is restored to the original measurement signal by a second frequency conversion module and the original measurement signal is transmitted to a first measurement receiver, and the high-frequency measurement signal is restored to the original measurement signal by a fifth frequency conversion module and the original measurement signal is transmitted to a second measurement receiver. The present invention also discloses a device for expanding the measurement frequency band based on a vector network analyzer. The present invention utilizes the spectrum shifting effect of the frequency conversion module to shift the measurement frequency band of the vector network analyzer in the low-frequency band to a higher frequency band, realizing the expansion of the frequency band of the vector network analyzer.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a method for expanding a measurement frequency band based on a vector network analyzer and a device for expanding a measurement frequency band based on a vector network analyzer. Background Art

[0002] A vector network analyzer is a test device for electromagnetic wave energy. It can measure both the amplitude values of various parameters of a single-port network or a two-port network and the phase. The vector network analyzer can display test data using a Smith chart.

[0003] With the development of measurement technologies, the required test frequency range is getting wider and wider. Among them, the higher the frequency, the higher the requirements for microwave and millimeter-wave device processes, and the higher the cost. Since the price of a broadband frequency synthesizer is extremely expensive, the price of the vector network analyzer increases significantly as the measurement frequency increases.

[0004] Therefore, it is necessary to develop a vector network analyzer with low cost and high frequency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and a device for expanding a measurement frequency band based on a vector network analyzer, which have a simple structure and strong flexibility, can shift the measurement frequency band of a vector network analyzer in a low frequency band to a higher frequency band, realize the frequency band expansion of the vector network analyzer, and greatly improve the economic benefits.

[0006] To solve the above technical problem, the present invention provides a method for expanding a measurement frequency band based on a vector network analyzer, including:

[0007] Reference signal measurement: A first signal source port outputs an original measurement signal to a first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and sequentially transmits the high-frequency measurement signal through a first coupler and a second coupler to a third frequency conversion module. The third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to a first reference receiver;

[0008] Reflection signal measurement: A first signal source port outputs an original measurement signal to a first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and sequentially transmits the high-frequency measurement signal through a first coupler, a second coupler, and a first output port to a device under test. The device under test sequentially reflects the high-frequency measurement signal through the first output port, the second coupler, and the first coupler to a second frequency conversion module. The second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to a first measurement receiver;

[0009] Transmission measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and outputs the high-frequency measurement signal to the device under test (DUT) through the first coupler, the second coupler, and the first output port in sequence. The DUT transmits the high-frequency measurement signal to the fifth frequency conversion module through the second output port, the third coupler, and the fourth coupler in sequence. The fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

[0010] As an improvement to the above solution, the method for measuring the reference signal includes: The first signal source port outputs an original measurement signal to the first frequency conversion module; The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler; The first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler; The second coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the third frequency conversion module; The third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first reference receiver.

[0011] As an improvement to the above solution, the method for measuring the reflection signal includes: The first signal source port outputs an original measurement signal to the first frequency conversion module; The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler; The first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler; The second coupler performs coupling processing on the high-frequency measurement signal and outputs the processed high-frequency measurement signal to the DUT through the first output port; The DUT reflects the high-frequency measurement signal to the second coupler through the first output port; The second coupler performs coupling processing on the reflected high-frequency measurement signal and reflects the processed high-frequency measurement signal to the first coupler; The first coupler performs coupling processing on the reflected high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second frequency conversion module; The second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first measurement receiver.

[0012] As an improvement of the above solution, the method for transmission measurement includes: the first signal source port outputs an original measurement signal to the first frequency conversion module; the first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler; the first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler; the second coupler performs coupling processing on the high-frequency measurement signal and outputs the processed high-frequency measurement signal to the device under test through the first output port; the device under test transmits the high-frequency measurement signal to the third coupler through the second output port; the third coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the fourth coupler; the fourth coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the fifth frequency conversion module; the fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

[0013] Correspondingly, the present invention further provides a measurement frequency band expansion device based on a vector network analyzer, including: a vector network analyzer, a frequency conversion module, a first coupler, a second coupler, a third coupler, a fourth coupler, a first output port and a second output port. The frequency conversion module includes a first frequency conversion module, a second frequency conversion module, a third frequency conversion module and a fifth frequency conversion module. The vector network analyzer is provided with a first signal source port, a first measurement receiver, a first reference receiver and a second measurement receiver; the first signal source port, the first frequency conversion module, the first coupler, the second coupler, the third frequency conversion module and the first reference receiver are connected in sequence to form a reference signal measurement loop; the first signal source port, the first frequency conversion module, the first coupler, the second coupler, the first output port and the device under test are connected in sequence, and the device under test, the first output port, the second coupler, the first coupler, the second frequency conversion module and the first measurement receiver are connected in sequence to form a reflection signal measurement loop; the first signal source port, the first frequency conversion module, the first coupler, the second coupler, the first output port, the device under test, the second output port, the third coupler, the fourth coupler, the fifth frequency conversion module and the second measurement receiver are connected in sequence to form a transmission measurement loop.

[0014] As an improvement of the above solution, the first frequency conversion module is an up-conversion module.

[0015] As an improvement of the above solution, the second frequency conversion module, the third frequency conversion module and the fifth frequency conversion module are all down-conversion modules.

[0016] As an improvement of the above solution, the local oscillators of the first frequency conversion module, the second frequency conversion module, the third frequency conversion module and the fifth frequency conversion module are the same.

[0017] As an improvement of the above solution, the frequency conversion module includes a first control switch, a basic circuit, an extended circuit and a second control switch; when the basic circuit is turned on with the first control switch and the second control switch, the frequency conversion module operates in a normal mode; when the extended circuit is turned on with the first control switch and the second control switch, the frequency conversion module operates in an extended mode.

[0018] As an improvement of the above solution, the extended circuit includes a mixer, an amplifier and a band-pass filter connected in sequence.

[0019] Implementing the present invention has the following beneficial effects:

[0020] The present invention utilizes the spectrum shifting effect of the frequency conversion module to change the frequency information, thereby shifting the measurement frequency band of the vector network analyzer in the low frequency band to a higher frequency band. While ensuring that the signal passing through the device under test is a high-frequency measurement signal, it also ensures that the amplitude and phase information that the vector network analyzer needs to detect is not changed. Therefore, the vector network analyzer actually measures the parameters of the high-frequency measurement signal, realizing the frequency band expansion of the vector network analyzer, with strong flexibility, and can also achieve higher-frequency measurements at a lower cost, greatly improving economic benefits. Description of the Drawings

[0021] Figure 1 is a schematic flowchart of the method for expanding the measurement frequency band of the vector network analyzer based on the present invention;

[0022] Figure 2 is a schematic structural diagram of the device for expanding the measurement frequency band of the vector network analyzer based on the present invention;

[0023] Figure 3 is a schematic structural diagram of the frequency conversion module in the present invention. Detailed Embodiments

[0024] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings. It is hereby declared that the orientation terms such as up, down, left, right, front, back, inside, and outside that appear or will appear in the text of the present invention are only based on the drawings of the present invention, and they do not specifically limit the present invention.

[0025] The method for expanding the measurement frequency band of the vector network analyzer based on the present invention utilizes the spectrum shifting effect of the frequency conversion module to shift the measurement frequency band of the vector network analyzer in the low frequency band to a higher frequency band, realizing the frequency band expansion of the vector network analyzer.

[0026] For example, if the original measurement frequency band is Fa~Fb, and the frequency band is shifted by f using the frequency conversion module, the measurement frequency band becomes F(a + f)~F(b + f). When superimposed with the far frequency band, when a + f ≤ b is satisfied, the frequency band can be expanded to Fa~F(b + f).

[0027] Specifically, the method for expanding the measurement frequency band based on a vector network analyzer according to the present invention involves the measurement of three types of signals (reference signal measurement, reflection signal measurement, transmission measurement). The specific measurement process is as follows:

[0028] Reference signal measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module; the first frequency conversion module converts the original measurement signal into a high-frequency measurement signal, and transmits the high-frequency measurement signal to the third frequency conversion module through the first coupler and the second coupler in sequence; the third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first reference receiver.

[0029] Reflection signal measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module; the first frequency conversion module converts the original measurement signal into a high-frequency measurement signal, and transmits the high-frequency measurement signal to the device under test through the first coupler, the second coupler and the first output port in sequence; the device under test reflects the high-frequency measurement signal to the second frequency conversion module through the first output port, the second coupler and the first coupler in sequence; the second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first measurement receiver.

[0030] Transmission measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module; the first frequency conversion module converts the original measurement signal into a high-frequency measurement signal, and transmits the high-frequency measurement signal to the device under test through the first coupler, the second coupler and the first output port in sequence; the device under test transmits the high-frequency measurement signal to the fifth frequency conversion module through the second output port, the third coupler and the fourth coupler in sequence; the fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

[0031] The following further describes the present invention in combination with specific real-time modes:

[0032] The method for the reference signal measurement includes:

[0033] S101, the first signal source port outputs an original measurement signal to the first frequency conversion module;

[0034] S102, the first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler;

[0035] S103, the first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler;

[0036] S104, The second coupler couples the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the third frequency conversion module;

[0037] S105, The third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first reference receiver.

[0038] Therefore, during the reference signal measurement process, through the cooperation of the first frequency conversion module and the third frequency conversion module, the amplitude and phase information that the vector network analyzer needs to detect is not changed.

[0039] The method for measuring the reflection signal includes:

[0040] S101, The first signal source port outputs the original measurement signal to the first frequency conversion module;

[0041] S102, The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler;

[0042] S103, The first coupler couples the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler;

[0043] S204, The second coupler couples the high-frequency measurement signal and outputs the processed high-frequency measurement signal to the device under test through the first output port;

[0044] S205, The device under test reflects the high-frequency measurement signal to the second coupler through the first output port;

[0045] S206, The second coupler couples the reflected high-frequency measurement signal and reflects the processed high-frequency measurement signal to the first coupler;

[0046] S207, The first coupler couples the reflected high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second frequency conversion module;

[0047] S208, The second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first measurement receiver.

[0048] Therefore, during the reflection signal measurement process, through the cooperation of the first frequency conversion module and the second frequency conversion module, the signal passing through the device under test is a high-frequency measurement signal, and the amplitude and phase information that the vector network analyzer needs to detect is not changed.

[0049] The method for measuring the transmission includes:

[0050] S101, The first signal source port outputs an original measurement signal to the first frequency conversion module;

[0051] S102, The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler;

[0052] S103, The first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler;

[0053] S204, The second coupler performs coupling processing on the high-frequency measurement signal and outputs the processed high-frequency measurement signal to the device under test through the first output port;

[0054] S305, The device under test transmits the high-frequency measurement signal to the third coupler through the second output port;

[0055] S306, The third coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the fourth coupler;

[0056] S307, The fourth coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the fifth frequency conversion module;

[0057] S308, The fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

[0058] Therefore, during the transmission measurement process, through the cooperation of the first frequency conversion module and the fifth frequency conversion module, the signal passing through the device under test is a high-frequency measurement signal, and the amplitude and phase information that the vector network analyzer needs to detect is not changed.

[0059] In addition, in the present invention, all frequency conversion modules (the first frequency conversion module, the second frequency conversion module, the third frequency conversion module, the fourth frequency conversion module, the fifth frequency conversion module, and the sixth frequency conversion module) use the same reference source, so that the phase difference from the same reference source to each frequency conversion module is constant, ensuring frequency consistency.

[0060] As can be seen from the above, the original measurement signal F is output from the first signal source port, and after passing through the first frequency conversion module, it becomes a high-frequency measurement signal F + df; after passing through the first coupler, the coupled signal is absorbed; the high-frequency measurement signal F + df continues to pass through the second coupler, and the coupled signal is transmitted to the third frequency conversion module, restored to the original measurement signal F, and transmitted to the first reference receiver to complete the reference signal measurement; at the same time, the high-frequency measurement signal F + df passing through the second coupler is output from the first output port and enters the device under test; the high-frequency measurement signal F + df reflected back at the first output port passes through the second coupler, the coupled signal is absorbed, and then continues to pass through the first coupler. The coupled signal is restored to the original measurement signal F by the second frequency conversion module and transmitted to the first measurement receiver to complete the reflection signal measurement; correspondingly, the high-frequency measurement signal F + df passing through the device under test is transmitted to the third coupler through the second output port, the coupled signal is absorbed, and then continues to be transmitted to the fourth coupler. The coupled signal is restored to the original measurement signal F by the fifth frequency conversion module and then transmitted to the second measurement receiver to complete the transmission measurement.

[0061] Therefore, in the present invention, the vector network analyzer uses the original measurement signal F, and the signal passing through the device under test is the high-frequency measurement signal F + df. The frequency conversion modules (the first frequency conversion module, the second frequency conversion module, the third frequency conversion module, and the fifth frequency conversion module) only perform spectrum shifting to change the frequency information, and the amplitude and phase information that the vector network analyzer needs to detect is not changed. Therefore, the parameters of the high-frequency measurement signal F + df are actually measured by the vector network analyzer, thereby realizing the expansion of the measurement frequency band of the vector network analyzer.

[0062] See Figure 2 , Figure 2 shows the specific structure of the measurement frequency band expansion device based on the vector network analyzer of the present invention, which includes a vector network analyzer, a frequency conversion module, a first coupler C1, a second coupler C2, a third coupler C3, a fourth coupler C4, a first output port T1, and a second output port T2. The frequency conversion module includes a first frequency conversion module F1, a second frequency conversion module F2, a third frequency conversion module F3, and a fifth frequency conversion module F5. The vector network analyzer is provided with a first signal source port S1, a first measurement receiver M1, a first reference receiver R1, and a second measurement receiver M2. The first coupler C1, the second coupler C2, the third coupler C3, and the fourth coupler C4 are preferably directional couplers, but are not limited thereto.

[0063] The first signal source port S1, the first frequency conversion module F1, the first coupler C1, the second coupler C2, the third frequency conversion module F3, and the first reference receiver R1 are connected in sequence to form a reference signal measurement loop.

[0064] The first signal source port S1, the first frequency conversion module F1, the first coupler C1, the second coupler C2, the first output port T1, and the device under test Q are connected in sequence. The device under test Q, the first output port T1, the second coupler C2, the first coupler C1, the second frequency conversion module F2, and the first measurement receiver M1 are connected in sequence to form a reflection signal measurement loop.

[0065] The first signal source port S1, the first frequency conversion module F1, the first coupler C1, the second coupler C, the first output port T1, the device under test Q, the second output port T2, the third coupler C3, the fourth coupler C4, the fifth frequency conversion module F5, and the second measurement receiver M2 are connected in sequence to form a transmission measurement loop.

[0066] The working principle of the present invention is as follows: The original measurement signal F is output from the first signal source port S1, and after passing through the first frequency conversion module F1, it becomes a high-frequency measurement signal F+df; after passing through the first coupler C1, the coupled signal is absorbed; the high-frequency measurement signal F+df continues to pass through the second coupler C2, and the coupled signal is transmitted to the third frequency conversion module F3, where it is restored to the original measurement signal F and transmitted to the first reference receiver R1 to complete the reference signal measurement; at the same time, the high-frequency measurement signal F+df passing through the second coupler C2 is output from the first output port T1 and enters the device under test Q; the high-frequency measurement signal F+df reflected back at the first output port T1 passes through the second coupler C2, the coupled signal is absorbed, and then continues to pass through the first coupler C1. The coupled signal is restored to the original measurement signal F by the second frequency conversion module F2 and transmitted to the first measurement receiver M1 to complete the reflection signal measurement; correspondingly, the high-frequency measurement signal F+df passing through the device under test Q is transmitted to the third coupler C3 through the second output port T2, the coupled signal is absorbed, and then continues to be transmitted to the fourth coupler C4. The coupled signal is restored to the original measurement signal F by the fifth frequency conversion module F5 and then transmitted to the second measurement receiver M2 to complete the transmission measurement.

[0067] Further, the frequency conversion module further includes a fourth frequency conversion module F4 and a sixth frequency conversion module F6. The vector network analyzer is further provided with a second signal source port S2 and a second reference receiver R2. The fourth frequency conversion module F4 is respectively connected to the third coupler C3 and the second signal source port S2, and the sixth frequency conversion module F6 is respectively connected to the fourth coupler C4 and the second reference receiver R2. During operation, the principle of the original measurement signal output from the second signal source port S2 is the same as that of the first signal source port S1.

[0068] Meanwhile, the first frequency conversion module F1 and the sixth frequency conversion module F6 are up-conversion modules, and the second frequency conversion module F2, the third frequency conversion module F3, the fourth frequency conversion module F4, and the fifth frequency conversion module F5 are all down-conversion modules. The local oscillators (i.e., the shifting frequencies) of the first frequency conversion module F1, the second frequency conversion module F2, the third frequency conversion module F3, the fourth frequency conversion module F4, the fifth frequency conversion module F5, and the sixth frequency conversion module F6 are the same. That is, all the frequency conversion modules (the first frequency conversion module F1, the second frequency conversion module F2, the third frequency conversion module F3, the fourth frequency conversion module F4, the fifth frequency conversion module F5, and the sixth frequency conversion module F6) in the present invention adopt the same reference source, so that the phase difference from the same reference source to each frequency conversion module is constant, ensuring frequency consistency.

[0069] As Figure 3 shown, the frequency conversion module includes a first control switch K1, a basic circuit, an extended circuit, and a second control switch K2. The extended circuit includes a mixer F', an amplifier D, and a band-pass filter B connected in sequence. The basic circuit can be a wire.

[0070] When the basic circuit is turned on with the first control switch K1 and the second control switch K2, the frequency conversion module operates in the normal mode.

[0071] When the extended circuit is turned on with the first control switch K1 and the second control switch K2, the frequency conversion module operates in the extended mode.

[0072] It should be noted that in the frequency conversion modules (the first frequency conversion module F1, the second frequency conversion module F2, the third frequency conversion module F3, the fourth frequency conversion module F4, the fifth frequency conversion module F5, and the sixth frequency conversion module F6), when frequency conversion is not required, the first control switch K1 and the second control switch K2 can be connected to the basic circuit at the same time. When frequency conversion is required, the first control switch K2 and the second control switch K2 can be connected to the extended circuit at the same time. Correspondingly, in addition to the basic circuit and the extended circuit, other circuits can be added to further improve the diversity of frequency extension, with strong flexibility.

[0073] Therefore, by utilizing the spectrum shifting effect of the frequency conversion module, the present invention can shift the measurement frequency band of the vector network analyzer in the low frequency band to a higher frequency band, realizing the frequency band extension of the vector network analyzer, with strong flexibility, and can also achieve higher frequency measurement at a lower cost, greatly improving the economic benefits.

[0074] The above is the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A measurement frequency band expansion method based on a vector network analyzer, characterized in that, The vector network analyzer is provided with a first signal source port, a first measurement receiver, a first reference receiver and a second measurement receiver. The measurement frequency band extension method includes: Reference signal measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the third frequency conversion module through the first coupler and the second coupler in sequence. The third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first reference receiver; Reflection signal measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the device under test through the first coupler, the second coupler and the first output port in sequence. The device under test reflects the high-frequency measurement signal to the second frequency conversion module through the first output port, the second coupler and the first coupler in sequence. The second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first measurement receiver; Transmission measurement: The first signal source port outputs an original measurement signal to the first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the device under test through the first coupler, the second coupler and the first output port in sequence. The device under test transmits the high-frequency measurement signal to the fifth frequency conversion module through the second output port, the third coupler and the fourth coupler in sequence. The fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

2. The measurement frequency band extension method based on a vector network analyzer according to claim 1, wherein the method for reference signal measurement includes: The first signal source port outputs an original measurement signal to the first frequency conversion module; The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler; The first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler; The second coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the third frequency conversion module; The third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first reference receiver.

3. The measurement frequency band extension method based on a vector network analyzer according to claim 1, wherein the method for reflection signal measurement includes: The first signal source port outputs an original measurement signal to the first frequency conversion module; The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler; The first coupler performs coupling processing on the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler; The second coupler performs coupling processing on the high-frequency measurement signal and outputs the processed high-frequency measurement signal to the device under test through the first output port; The device under test reflects the high-frequency measurement signal to the second coupler through the first output port; The second coupler couples the reflected high-frequency measurement signal and reflects the processed high-frequency measurement signal to the first coupler; The first coupler couples the reflected high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second frequency conversion module; The second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first measurement receiver.

4. The method for expanding the measurement frequency band based on a vector network analyzer according to claim 1, wherein the method for transmitting the measurement includes: The first signal source port outputs the original measurement signal to the first frequency conversion module; The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal to the first coupler; The first coupler couples the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the second coupler; The second coupler couples the high-frequency measurement signal and outputs the processed high-frequency measurement signal to the device under test through the first output port; The device under test transmits the high-frequency measurement signal to the third coupler through the second output port; The third coupler couples the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the fourth coupler; The fourth coupler couples the high-frequency measurement signal and transmits the processed high-frequency measurement signal to the fifth frequency conversion module; The fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

5. A measurement frequency band expansion device based on a vector network analyzer, characterized in that, It includes a vector network analyzer, a frequency conversion module, a first coupler, a second coupler, a third coupler, a fourth coupler, a first output port and a second output port. The frequency conversion module includes a first frequency conversion module, a second frequency conversion module, a third frequency conversion module and a fifth frequency conversion module. The vector network analyzer is provided with a first signal source port, a first measurement receiver, a first reference receiver and a second measurement receiver; The first signal source port, the first frequency conversion module, the first coupler, the second coupler, the third frequency conversion module and the first reference receiver are connected in sequence to form a reference signal measurement loop; the first signal source port outputs the original measurement signal to the first frequency conversion module, the first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and transmits the high-frequency measurement signal through the first coupler and the second coupler to the third frequency conversion module in sequence, and the third frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first reference receiver; The first signal source port, the first frequency conversion module, the first coupler, the second coupler, the first output port and the device under test are connected in sequence. The device under test, the first output port, the second coupler, the first coupler, the second frequency conversion module and the first measurement receiver are connected in sequence to form a reflected signal measurement loop. The first signal source port outputs an original measurement signal to the first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and outputs the high-frequency measurement signal to the device under test through the first coupler, the second coupler and the first output port in sequence. The device under test reflects the high-frequency measurement signal to the second frequency conversion module through the first output port, the second coupler and the first coupler in sequence. The second frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the first measurement receiver. The first signal source port, the first frequency conversion module, the first coupler, the second coupler, the first output port, the device under test, the second output port, the third coupler, the fourth coupler, the fifth frequency conversion module and the second measurement receiver are connected in sequence to form a transmission measurement loop. The first signal source port outputs an original measurement signal to the first frequency conversion module. The first frequency conversion module converts the original measurement signal into a high-frequency measurement signal and outputs the high-frequency measurement signal to the device under test through the first coupler, the second coupler and the first output port in sequence. The device under test transmits the high-frequency measurement signal to the fifth frequency conversion module through the second output port, the third coupler and the fourth coupler in sequence. The fifth frequency conversion module restores the high-frequency measurement signal to the original measurement signal and transmits the original measurement signal to the second measurement receiver.

6. The measurement frequency band expansion device based on a vector network analyzer according to claim 5, characterized in that, The first frequency conversion module is an up-conversion module.

7. The measurement frequency band expansion device based on a vector network analyzer according to claim 5, wherein The second frequency conversion module, the third frequency conversion module and the fifth frequency conversion module are all down-conversion modules.

8. The measurement frequency band expansion device based on a vector network analyzer according to claim 5, characterized in that, The local oscillators of the first frequency conversion module, the second frequency conversion module, the third frequency conversion module and the fifth frequency conversion module are the same.

9. The measurement frequency band expansion device based on a vector network analyzer according to claim 5, characterized in that, The frequency conversion module includes a first control switch, a basic circuit, an extended circuit and a second control switch. When the basic circuit is turned on with the first control switch and the second control switch, the frequency conversion module operates in the normal mode. When the extended circuit is turned on with the first control switch and the second control switch, the frequency conversion module operates in the extended mode.

10. The measurement frequency band expansion device based on a vector network analyzer according to claim 9, characterized in that, The extended circuit includes a mixer, an amplifier and a band-pass filter connected in sequence.

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