Apparatus and method for implementing measurement of source standing wave ratio by using vector network analyzer

Abstract

The present disclosure relates to the technical field of microwave testing, and provides an apparatus and method for implementing measurement of a source standing wave ratio by using a vector network analyzer. The method comprises: first, setting operating parameters of a vector network analyzer and a signal generator under test, so that a vector network excitation source and the signal generator under test operate at the same frequency, and the vector network analyzer and the signal generator under test share a reference time base; acquiring operating data of the vector network analyzer; when the vector network analyzer operates in a frequency sweep state, enabling, by means of a provided control switch K1, the vector network analyzer to first be connected to a circuit breaker, and then be disconnected from the circuit breaker to be connected to an output terminal of the signal generator under test; and acquiring a measurement signal outputted by a receiver of the vector network analyzer for signal processing, and obtaining a measurement result of a source standing wave ratio. In the present disclosure, the apparatus for testing the source standing wave ratio of a signal source is constructed on the basis of the vector network analyzer, such that automatic frequency sweep testing can be implemented, thereby improving the accuracy and efficiency of measuring the source standing wave ratio of an active device.

Description

An apparatus and method for measuring source standing wave ratio using a vector network analyzer.

[0001] Cross-references to related applications

[0002] This invention claims priority to Chinese Patent Application No. 202510077809.2, filed on January 17, 2025, entitled "A device and method for measuring source standing wave ratio using a vector network analyzer", the entire contents of which are incorporated herein by reference and constitute a part of this invention for all purposes. Technical Field

[0003] This disclosure relates to the field of microwave testing technology, specifically to a device and method for measuring source standing wave ratio using a vector network analyzer. Background Technology

[0004] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0005] Source VSWR refers to the standing wave ratio at the output of a signal source (such as a signal generator) under actual operating conditions. It reflects the matching state between the signal source and the load. Since the signal source itself outputs a signal, its output characteristics are easily affected by interference, making source VSWR measurement more complex than ordinary load VSWR measurement. Classic signal generator VSWR testing methods include the movable detector method, reflectometer method, and extended air wire method. These methods either cannot perform frequency sweep measurements or have complex systems, and the calibration uncertainty cannot be guaranteed; therefore, these methods are used less and less. The movable detector method and reflectometer method for measuring signal generator VSWR can only operate at a single frequency, and the test accuracy is affected by the detector, requiring prior linearity calibration, a complex process with low accuracy. The extended air line method can be used for frequency sweep testing via a scalar network analyzer. The test data is closely related to the directionality of the return loss bridge, making the calculation complex and the accuracy low. The live frequency selection test method is a point frequency test method. To test the VSWR of the signal generator across the entire operating frequency band, there must be a difference frequency between the test frequency and the source output frequency. This requires setting up each instrument point by point, resulting in very low test efficiency.

[0006] Vector network analyzers (VNAs) are commonly used to test the standing wave ratio (SWR) of passive devices. Calibration of the VNA allows for rapid determination of the SWR at any port. However, for active devices such as microwave amplifiers and microwave signal generators, when the output port has an output signal and is in a hot state, the output signal and the VNA excitation signal are superimposed in the receiver as a composite vector signal. The VNA receiver cannot distinguish between the reflected signal and the device's own output signal, making it impossible to accurately measure the SWR at the output port. This is because both the excitation and output signals have frequency, amplitude, and phase. Therefore, existing VNAs cannot be directly used to measure the source SWR of active devices. Some researchers have adopted a non-powered conventional testing method, treating the signal output port as a normal load for testing without power. This method is simple and easy to implement, but its biggest drawback is that the VSWR of the signal source under test is in a cold state. The cold state is the state of being powered off and not working or having its RF output turned off, which is different from the hot state when it is actually working. The measured data cannot reflect the port VSWR of the signal generator in the actual working state. Summary of the Invention

[0007] To address the aforementioned problems, this disclosure proposes a device and method for measuring source standing wave ratio (VSWR) using a vector network analyzer. A test device for the VSWR of a signal source is constructed based on the vector network analyzer, enabling automatic frequency sweep testing and improving the accuracy and efficiency of VSWR measurement for active devices.

[0008] To achieve the above objectives, the present disclosure adopts the following technical solution:

[0009] One or more embodiments provide a method for measuring source standing wave ratio (VSWR) using a vector network analyzer, comprising the following steps:

[0010] Set the operating parameters of the vector network analyzer and the signal generator under test so that the operating frequency of the vector network excitation source is the same as that of the signal generator under test, and the vector network analyzer and the signal generator under test share a common reference time base;

[0011] Acquire operational data from the vector network analyzer;

[0012] When the vector network analyzer is operating in frequency sweep mode, the control switch K1 is set to make the vector network analyzer first connect the short circuit and then disconnect the short circuit to connect the output terminal of the signal generator under test.

[0013] The measurement signal output from the vector network analyzer receiver is acquired and processed to obtain the source standing wave ratio (VSWR) measurement result.

[0014] One or more embodiments provide an apparatus for measuring source standing wave ratio using a vector network analyzer, comprising:

[0015] The system includes a vector network analyzer, a short circuit device, a control switch K1, and a main controller; the main controller is communicatively connected to the control switch K1.

[0016] The main controller controls the on position of the control switch K1, thereby controlling the test port of the vector network analyzer to be connected to the signal output port of the short circuit device or the signal generator under test through the control switch K1; the main controller is configured to perform the steps of the above-described method for measuring source standing wave ratio using a vector network analyzer.

[0017] Compared with the prior art, the beneficial effects of this disclosure are as follows:

[0018] In this disclosure, by setting a controllable switch on the test port of the vector network analyzer, during the automatic frequency sweep process of the vector network analyzer, the short circuit is first turned on, and the vector network measures the 100% reflection response through the short-circuited reflected signal, thereby calibrating the reflection measurement reference of the system. The VSWR reference signal is automatically measured for each frequency signal, realizing automatic frequency sweep measurement, and improving the accuracy of the source VSWR measurement of the signal source under test.

[0019] The advantages of this disclosure, as well as its additional advantages, will be described in detail in the following specific embodiments. Attached Figure Description

[0020] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute a limitation thereof.

[0021] Figure 1 is a block diagram of the device for measuring source standing wave ratio using a vector network analyzer according to Embodiment 1 of this disclosure;

[0022] Figure 2 is an exploded view of the signal acquired by the vector network analyzer receiver in Embodiment 1 of this disclosure;

[0023] Figure 3 is a flowchart of the method of Embodiment 2 of this disclosure; Detailed Implementation

[0024] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0026] It should be noted that the terminology used herein is for descriptive purposes only and is not intended to limit the exemplary embodiments according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. It should be noted that, without conflict, the various embodiments and features within those embodiments can be combined with each other. The embodiments will now be described in detail with reference to the accompanying drawings.

[0027] Example 1

[0028] In one or more of the technical solutions disclosed in the embodiments, as shown in Figures 1 and 2, a device for measuring source standing wave ratio using a vector network analyzer includes: a vector network analyzer, a short circuit, a control switch K1, and a main controller; the main controller is communicatively connected to the control switch K1; the main controller controls the on position of the control switch K1, thereby controlling the test port of the vector network analyzer to be connected to the signal output port of the short circuit or the signal generator under test through the control switch K1;

[0029] The vector network analyzer is connected via control switch K1 and a programmable cable.

[0030] A further technical solution, as described above, is to integrate the control logic of the main controller into the vector network analyzer's controller. In addition to setting and controlling the working state of the vector network analyzer, the vector network analyzer controller also connects to the signal generator under test via a data communication interface. The working state (frequency, power, etc.) of the signal generator under test is set through the vector network analyzer controller, thereby controlling the test port of the vector network analyzer and the signal output port of the signal generator under test.

[0031] In this embodiment, by setting a controllable switch on the test port of the vector network analyzer, during the automatic frequency sweep process of the vector network analyzer, the short circuit is first turned on, and the vector network measures the 100% reflection response through the short-circuited reflected signal, thereby calibrating the reflection measurement reference of the system. The VSWR reference signal is automatically measured for each frequency signal, realizing automatic frequency sweep measurement, and improving the accuracy of the source VSWR measurement of the signal source under test.

[0032] A further technical solution involves the main controller communicating with the controller within the vector network tester to acquire the vector network's operating data, including operating mode and sweep frequency parameters.

[0033] Optionally, the main controller is also connected to an input device for inputting configuration data. If the main controller and the vector network analyzer do not establish a communication connection, the working mode of the vector network analyzer can be directly input to the main controller.

[0034] Specifically, input devices may include, but are not limited to, keyboards, mice, touchscreens, etc.

[0035] Figure 1 shows the specific system connection diagram. The left side is a schematic diagram of the internal structure of the designed vector network analyzer. A phase-locked loop is connected to both ends of the signal generator V1 of the vector network analyzer to improve the frequency and phase stability of the output signal of the signal generator V1 and to realize the adjustment of the signal frequency and phase.

[0036] In Figure 1, the box on the left shows the internal circuitry of the improved vector network analyzer:

[0037] Signal source V1 generates an excitation signal; directional coupler H1 separates a portion of the energy (e.g., 10%) from the signal path to the receiver for measuring the excitation or reflected signal. Mixers M1 and M2, located at the intersection of the RF and LO channels, mix the high-frequency signal (RF) with the local oscillator (LO) signal to generate an intermediate frequency (IF) signal. An attenuator within the vector network attenuates the amplitude of the input signal, ensuring the signal amplitude remains within the receiver's measurement range and preventing receiver overload. An IF amplifier connected after the mixer amplifies the mixed IF signal to improve signal amplitude and signal-to-noise ratio (SNR).

[0038] The receiver module is used to receive the intermediate frequency signal after mixing and amplification, and to perform amplitude and phase measurement and analysis. a1 represents the receiver for the incident signal path; b1 represents the receiver for the reflected signal path.

[0039] In Figure 1, the internal circuit of the vector network is divided into two symmetrical upper and lower parts, which work on the same principle and will not be described again. In this embodiment, the lower part is used to implement the measurement of a signal generator.

[0040] The internal workflow of a vector network analyzer is as follows:

[0041] Signal source V1 generates an excitation signal (radio frequency signal), and a portion of the signal is separated by a directional coupler for measuring the incident signal (a1) and the reflected signal (b1).

[0042] The excitation signal is connected to the device under test (or short circuit), and part of the signal is reflected back to the vector network analyzer.

[0043] The mixer mixes the received incident signal with the local oscillator signal (LO) to generate an intermediate frequency signal (IF).

[0044] The intermediate frequency amplifier amplifies the IF signal, improving measurement accuracy and signal-to-noise ratio.

[0045] The receiver receives the incident signal and the reflected signal respectively;

[0046] The reflection coefficient and standing wave ratio (VSWR) of the measured object are obtained by calculating the amplitude and phase of the signal received by the receiver.

[0047] The working process of the entire device described above is explained below:

[0048] The main controller first sets the operating parameters of the vector network analyzer and the signal generator under test (SDT) to ensure that the vector network excitation signal is strictly synchronized with the operating frequency of the SDT. The vector network operating mode is set to source VSWR test, and the excitation signal output by the vector network is attenuated by the set attenuation amount. The sweep frequency parameters are set, including the test frequency range, frequency transition interval, and signal output power.

[0049] A further technical solution is to set the attenuation amount to be no less than the difference between the output power P1 of the measured source and the output power P2 of the vector network port; that is: attenuation amount ≥ P1 - P2;

[0050] After completing the above instrument settings, execute the source VSWR test procedure: First, connect a short circuit device to the cable port and send the corresponding prompt to perform single-port short circuit calibration; Second, connect the cable port to the signal source under test and send the corresponding prompt to perform the source VSWR test.

[0051] During the frequency sweep process, the vector network excitation signal undergoes 360° phase adjustment at each frequency point, causing the phase of the output signal to change gradually. The signal received by the receiver is a composite signal of the excitation signal and the reflected signal from the measured signal source. The amplitude of the composite signal varies sinusoidally due to the phase change, with its maximum value Umax and minimum value Umin corresponding to the states where the vector signals are in exactly the same phase and completely opposite phase, respectively. The main controller acquires the measurement signal from the vector network receiver and outputs the measurement result.

[0052] Example 2

[0053] Based on Embodiment 1, this embodiment provides a method for measuring source standing wave ratio using a vector network analyzer, which can be configured to be implemented in the main controller, as shown in Figure 3, including the following steps:

[0054] Step 1: Set the operating parameters of the vector network analyzer and the signal generator under test so that the operating frequency of the vector network excitation source is the same as that of the signal generator under test, and the vector network analyzer and the signal generator under test share a common reference time base;

[0055] Step 2: The main controller acquires the operating data of the vector network analyzer, including the operating mode and frequency sweep parameters;

[0056] Step 3: The main controller determines the working status of the vector network analyzer based on the acquired operating data. When the vector network analyzer is working in frequency sweep mode, the control switch K1 is set to make the vector network analyzer first connect the short circuit and then disconnect the short circuit to connect the output terminal of the signal generator under test.

[0057] Step 4: The main controller acquires the measurement signal output from the vector network analyzer receiver, processes the signal, and obtains the source standing wave ratio measurement result.

[0058] Furthermore, before step 1, the operating parameters of the vector network excitation source and the signal generator under test are set so that the operating frequency of the vector network excitation source is the same as that of the signal generator under test, which can ensure that the test frequency is the actual operating frequency of the signal generator.

[0059] In step 1, the main controller can be connected to the controller of the vector network analyzer, or the operating mode of the vector network analyzer can be manually entered into the main controller.

[0060] Alternatively, the control logic of the main controller can be integrated into the controller of the vector network analyzer, using the vector network as the controller;

[0061] A further technical solution is to set the attenuation amount to be no less than the difference between the output power P1 of the measured source and the output power P2 of the vector network port; that is: attenuation amount ≥ P1 - P2;

[0062] Preferably, the vector network attenuation is set to 10dB, and the attenuation is sequentially increased by 10dB to achieve frequency sweep testing of the source VSWR under different excitation powers.

[0063] In step 3, when the vector network analyzer is working in frequency sweep mode, the control switch K1 is used to make the vector network analyzer first connect the short circuit and then disconnect the short circuit to connect the output terminal of the signal generator under test.

[0064] Specifically, the direction of K1's operation: the direction in which the switch connects the circuit breaker and the direction in which it connects the signal generator under test;

[0065] Furthermore, during the frequency sweep measurement, at each frequency point, the vector-network excitation signal is phase-adjusted by at least 360°, causing the phase of the output signal to change gradually, so that the synthesized signal contains a maximum and a minimum value (as shown in Figure 2). That is, during the frequency sweep measurement, the vector-network excitation signal is phase-adjusted by 360° at each frequency point, causing the phase of the output signal to change gradually, so that the signal output of the vector-network receiver is a sine wave.

[0066] In the above scheme, by adjusting the phase of the vector network excitation signal, the synthesized waveform of the signal during frequency sweep can fully reflect the true operating state of the active device under test, enabling accurate measurement of the source VSWR. By gradually changing the phase of the excitation signal, the output signal and reflected signal of the signal generator under test can be effectively distinguished, thus avoiding the signal insemination and separation error problems caused by signal superposition in existing technologies. Since phase adjustment is performed at each frequency point, the maximum and minimum values ​​of the synthesized signal can be determined to effectively reduce the error caused by phase interference during measurement, ensuring that the signal output is a sine wave. This allows the vector network excitation to accurately measure the source VSWR of active devices in the hot state. This method is not only applicable to common active devices such as microwave amplifiers and microwave signal generators, but also to any other active device with an output signal, and can be widely used in the source VSWR measurement of various RF and microwave test equipment. Compared with traditional manual adjustment or other test methods, this embodiment, through automatic phase adjustment, can improve test efficiency while ensuring test accuracy and reducing the possibility of manual intervention and operational errors.

[0067] Specifically, the step size of phase modulation is set, and the signal output by the excitation source of the vector network analyzer is adjusted through a phase-locked loop;

[0068] Step 3: The main controller acquires the measurement signal output from the vector network analyzer receiver, processes the signal, and obtains the source standing wave ratio (VSWR) measurement result. The specific process is as follows:

[0069] Step 31: Acquire the measurement signal output by the receiver and identify the maximum and minimum values ​​of the signal amplitude;

[0070] Step 32: Calculate the amplitude of the reflected signal based on the obtained maximum and minimum values;

[0071] Step 33: Calculate the reflection coefficient of the port based on the amplitude of the reflected signal;

[0072] Step 34: Calculate the source standing wave ratio using the reflection coefficient.

[0073] The specific principles behind the above data processing procedure are explained below:

[0074] The excitation signal generated by port 1 of the vector network is:

[0075] Where V1 is the signal amplitude at the output port of the vector-internet excitation source; ω1 is the signal angular velocity at the output port of the vector-internet excitation source; t is time; β1 is the propagation constant; and z is the distance from receiver b1 to the port.

[0076] When the vector network analyzer is connected to the circuit breaker, the signal detected by receiver b1 of the vector network analyzer is:

[0077] Where L is the reflection coefficient and D is the coupling degree;

[0078] The signal output by the signal generator under test is:

[0079] Where V0 is the amplitude of the measured signal;

[0080] When the signal source V1 inside the vector network is turned off, and the signal generator under test is connected to the vector network, the signal detected by the receiver b1 of the vector network is:

[0081] When the signal source V1 inside the vector network is turned on, and the signal generator under test is connected to the vector network, the signal detected by the receiver b1 of the vector network is:

[0082] Figure 2 shows the decomposition of the signal received by signal receiver b1;

[0083] Vector V 源 : This indicates the signal directly output by the signal generator under test to the receiver b1;

[0084] Vector V 矢 : This indicates the reflected signal from the vector network signal source, which is reflected back to the receiver b1 after being reflected by the signal generator under test.

[0085] Vector V 合 : Represents vector V 源 and vector V 矢 The synthesized signal. This is the signal actually measured by the receiver.

[0086] By adjusting the phase of the vector network excitation signal by 360°, the output signal V is made... 矢 The phase changes gradually; during the gradual phase adjustment process, the vector V 源 and vector V 矢 The synthesized vector V 合 The amplitude will undergo a sinusoidal periodic change: when the two vectors are in phase, the resultant vector V 合 The amplitude reaches its maximum value Umax; when the two vectors are out of phase, the resultant vector V... 合 The amplitude reaches its minimum value Umin.

[0087] In step 31, the synthesized vector V 合 The difference between the maximum and minimum values ​​is exactly twice the amplitude of the reflected signal, as expressed by the formula:

[0088] Where Umax represents the maximum amplitude of the synthesized signal; Umin represents the minimum amplitude of the synthesized signal.

[0089] In step 33, based on the obtained reflected signal amplitude LV1, the reflected signal amplitude is divided by the amplitude of the excitation signal emitted by the vector network interface port to obtain the reflection coefficient Γ. L The calculation formula is as follows:

[0090] Among them, V 矢f Indicates the amplitude of the excitation signal transmitted at the vector network port; Γ L This represents the reflection coefficient, which reflects the impedance matching of the signal generator under test.

[0091] In step 34, the reflection coefficient Γ is used. L The formula for calculating the source VSWR is:

[0092] The test method described in this embodiment can not only measure the port source VSWR of a signal generator in its working state, but also be used to test the output port of any signal output product (such as a microwave amplifier) ​​in its actual working state. In this case, unlike the passive device output VSWR test method, the vector network 1 port and 2 port output excitation signals simultaneously.

[0093] The execution steps of the main controller for measuring the standing wave ratio (SWR) of a signal generator using a vector network analyzer, as described in this embodiment, can be integrated into the vector network analyzer as a functional module. By directly setting the frequency to be strictly the same, i.e., setting the frequency of the vector network excitation signal and the frequency of the source under test to be identical, it is possible to achieve a SWR measurement with the signal generator operating at the same frequency under actual conditions. Compared with classic signal generator SWR testing methods (movable detector method, reflectometer method, extended air wire method, etc.), no linearity calibration is required, resulting in improved testing accuracy, and frequency sweep testing is possible. Compared with electrically selective frequency testing methods, it achieves a SWR measurement with the signal generator operating at the same frequency (hot state) under actual conditions, without requiring a frequency difference between the excitation source and the source under test. Furthermore, in electrically selective frequency testing methods, the power of the reference source after passing through attenuators and directional couplers must be equal to that of the source under test, requiring a sufficiently large power of the reference source. In this embodiment, there are no requirements regarding the magnitude of the vector network excitation signal, thus resulting in a wider dynamic range of power measurement. Furthermore, it can perform frequency sweep measurement of the source standing wave ratio at each output frequency point. The test system only uses a standard vector network analyzer, making the system simple, capable of automatic testing, and offering high testing efficiency and accuracy.

[0094] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

[0095] While the specific embodiments of this disclosure have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this disclosure. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of this disclosure are still within the scope of protection of this disclosure.

Claims

1. A method for measuring source standing wave ratio using a vector network analyzer, characterized in that, Includes the following steps: Set the operating parameters of the vector network analyzer and the signal generator under test so that the operating frequency of the vector network excitation source is the same as that of the signal generator under test, and the vector network analyzer and the signal generator under test share a common reference time base; Acquire operational data from the vector network analyzer; When the vector network analyzer is operating in frequency sweep mode, the control switch K1 causes the vector network analyzer to first connect the short circuit and then disconnect the short circuit to connect the output terminal of the signal generator under test. The measurement signal output from the vector network analyzer receiver is acquired and processed to obtain the source standing wave ratio (VSWR) measurement result.

2. The method for measuring source standing wave ratio using a vector network analyzer as described in claim 1, characterized in that: The vector network attenuation was set to 10dB, and the attenuation was sequentially increased by 10dB to achieve a sweep frequency test of the source VSWR under different excitation powers.

3. The method for measuring source standing wave ratio using a vector network analyzer as described in claim 1, characterized in that: During the frequency sweep measurement, at each frequency point, the vector network excitation signal is phase-adjusted by at least 360°, so that the phase of the output signal changes gradually, and the synthesized signal contains a maximum value and a minimum value.

4. The method for measuring source standing wave ratio using a vector network analyzer as described in claim 1, characterized in that, The calculation process for the source standing wave ratio measurement results includes: Acquire the measurement signal output by the receiver and identify the maximum and minimum values ​​of the signal amplitude; Calculate the amplitude of the reflected signal based on the obtained maximum and minimum values; Calculate the reflection coefficient of the port based on the amplitude of the reflected signal; The source standing wave ratio is calculated using the reflection coefficient.

5. The method for measuring source standing wave ratio using a vector network analyzer as described in claim 4, characterized in that: During the frequency sweep measurement, the vector network excitation signal is phase-adjusted by 360° to obtain the synthesized vector V. 合 It is a sine wave, according to the composite vector V 合 The difference between the maximum and minimum values ​​is twice the amplitude of the reflected signal, and the amplitude of the reflected signal is calculated.

6. The method for measuring source standing wave ratio using a vector network analyzer as described in claim 5, characterized in that: The reflection coefficient is obtained by dividing the amplitude of the reflected signal by the amplitude of the excitation signal emitted from the vector network port.

7. A device for measuring source standing wave ratio using a vector network analyzer, characterized in that, include: The system includes a vector network analyzer, a short circuit device, a control switch K1, and a main controller; the main controller is communicatively connected to the control switch K1. The main controller controls the on position of the control switch K1, thereby controlling the test port of the vector network analyzer to be connected to the signal output port of the short circuit device or the signal generator under test through the control switch K1; the main controller is configured to perform the steps of the method for measuring source standing wave ratio using a vector network analyzer as described in any one of claims 1-6.

8. The apparatus for measuring source standing wave ratio using a vector network analyzer as described in claim 7, characterized in that: The main controller communicates with the controller inside the vector network tester to acquire the vector network's operating data; alternatively, the control logic of the main controller is integrated into the controller of the vector network tester.

9. The apparatus for measuring source standing wave ratio using a vector network analyzer as described in claim 7, characterized in that: The main controller is also connected to an input device for inputting configuration data.

10. The apparatus for measuring source standing wave ratio using a vector network analyzer as described in claim 7, characterized in that: The main controller is also connected to an input device for inputting configuration data.

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