Radio frequency test apparatus with voltage standing wave ratio adjustment and corresponding method

Abstract

The invention relates to a radio frequency test device with voltage standing wave ratio adjustment and a corresponding method. A radio frequency test device with voltage standing wave ratio adjustment for testing a device under test is provided. The radio frequency test device comprises an input terminal, an output terminal, a signal source for providing a test signal for the device under test via the output terminal, thereby forming an output signal path, a signal receiver for receiving a reception signal from the device under test via the input terminal, thereby forming an input signal path, and a tracking generator. In this case, the tracking generator and / or the signal receiver are configured to determine a respective voltage standing wave ratio at the input terminal and / or the output terminal. Furthermore, the signal source is configured to pre-equalize the test signal based on the respective voltage standing wave ratio at the output terminal and / or the input terminal. Additionally or alternatively, the signal receiver is configured to post-correct the reception signal based on the respective voltage standing wave ratio at the input terminal and / or the output terminal.

Description

Technical Field

[0001] This invention relates to radio frequency (RF) test apparatus and corresponding RF test methods. In particular, this invention relates to an RF test apparatus with voltage standing wave ratio (VSWR) adjustment for testing a device under test (DUT) and an RF test method with VSWR adjustment for testing a DUT. Background Technology

[0002] Typically, as the number of applications using radio frequency (RF) circuits continues to increase, the demand for RF test apparatuses and RF test methods with voltage standing wave ratio (VSWR) adjustment for testing devices under test (DUTs) including such applications is also growing, in order to verify the correct functioning of the applications in a highly accurate and efficient manner, where all systematic errors can be compensated.

[0003] However, both the RF test apparatus with voltage standing wave ratio (VSWR) adjustment for testing the device under test (DUT) and the RF test method with VSWR adjustment for testing the DUT are unknown. Summary of the Invention

[0004] Therefore, there is a need to provide an RF test apparatus with voltage standing wave ratio (VSWR) adjustment for testing a device under test (DUT) and an RF test method with VSWR adjustment for testing a DUT, wherein not only is the test highly accurate and efficient, but all systematic errors (exemplarily including: systematic errors from signal paths within the test apparatus, wiring between the test apparatus and the DUT, connections, and analog components) can be compensated.

[0005] This is achieved through the embodiments provided in this application. Advantageous implementations of the invention are further defined in this application.

[0006] According to a first aspect of the invention, an RF test apparatus with voltage standing wave ratio (VSWR) adjustment is provided for testing a device under test (DUT). The RF test apparatus includes: an input terminal; an output terminal; a signal source for providing a test signal to the DUT through the output terminal, thereby forming an output signal path; a signal receiver for receiving a received signal from the DUT through the input terminal, thereby forming an input signal path; and a tracking generator. In this configuration, the tracking generator and / or the signal receiver are configured to determine a corresponding VSWR at the input terminal and / or the output terminal. Furthermore, the signal source is configured to pre-equalize the test signal based on the corresponding VSWR at the output terminal and / or the input terminal. Alternatively, the signal receiver is configured to post-correct the received signal based on the corresponding VSWR at the input terminal and / or the output terminal. Advantageously, not only is the testing highly accurate and efficient, but all system errors can be compensated for.

[0007] Regarding the tracking generator and the signal receiver, it should be noted that it can be particularly advantageous if the tracking generator and the signal receiver are configured to be switchable between the input and the output.

[0008] It should also be noted that, especially when the corresponding behavior is substantially linear or linear, full correction can preferably be performed only on one corresponding side instead of the pre-equalization. In this case, it can be particularly advantageous if the full correction is performed only on the corresponding receiver side, especially since it can be purely digital.

[0009] Regarding the voltage standing wave ratio, it should be noted that the voltage standing wave ratio can be understood in particular as the ratio between the corresponding reflected wave and the incident wave, preferably the ratio with frequency.

[0010] Regarding the input terminal and the output terminal, it should be noted that the input terminal and the output terminal can in particular be a combined input-output terminal.

[0011] According to a first preferred embodiment of the first aspect of the invention, the signal source is configured to pre-equalize the test signal such that mismatch errors, particularly system mismatch errors, introduced by the output signal path are preferably corrected relative to a reference plane. Advantageously, for example, differentiation with respect to the respective error sources is unnecessary, thereby improving efficiency.

[0012] In a second preferred embodiment of the first aspect of the invention, the reference plane is located directly at the device under test, particularly at the input of the device under test. Advantageously, for example, the test can be performed in an unbiased manner, resulting in improved accuracy.

[0013] In another preferred embodiment of the first aspect of the invention, the signal receiver is configured to perform post-correction on the received signal such that mismatch errors introduced by the input signal path, particularly system mismatch errors, are preferably corrected relative to a reference plane. Advantageously, for example, differentiation with respect to the respective error sources is unnecessary, thereby reducing inefficiencies.

[0014] In another preferred embodiment of the first aspect of the invention, the reference plane is located directly at the device under test, particularly at the output of the device under test. Advantageously, for example, the test can be performed in an unbiased manner, resulting in improved testing, particularly in terms of accuracy.

[0015] According to another preferred embodiment of the first aspect of the invention, the radio frequency test apparatus further includes at least one additional input terminal and at least one orientation device, which is preferably used to connect the at least one additional input terminal to the signal receiver in addition to the input terminal. Advantageously, for example, multi-port devices under test can be tested in a particularly efficient manner.

[0016] Regarding this directional device, it should be noted that it can be any device that allows for the separation of incident and reflected waves. It may be particularly advantageous if the directional device includes at least one directional coupler, a measuring bridge, a resistance bridge, or any combination thereof.

[0017] According to another preferred embodiment of the first aspect of the invention, the tracking generator and / or the signal receiver are configured to preferably determine the corresponding voltage standing wave ratios at the input terminal and the at least one additional input terminal in a sequential manner. Advantageously, for example, this can reduce costs and thus improve efficiency.

[0018] According to another preferred embodiment of the first aspect of the invention, the radio frequency test apparatus further includes at least one additional output terminal and at least one orientation device, which is preferably used to connect the at least one additional output terminal to the signal source in addition to the output terminal. Advantageously, for example, multi-port devices under test can be tested in a particularly efficient manner.

[0019] Regarding this directional device, it should be noted that it can be any device that allows for the separation of incident and reflected waves. It may be particularly advantageous if the directional device includes at least one directional coupler, a measuring bridge, a resistance bridge, or any combination thereof.

[0020] Regarding the at least one additional output terminal and the at least one additional input terminal, it should be noted that the at least one additional input terminal and the at least one additional output terminal may in particular be at least one additional combined input-output terminal.

[0021] According to another preferred embodiment of the first aspect of the invention, the tracking generator is configured to preferably determine the corresponding voltage standing wave ratios at the output terminal and the at least one additional output terminal in a sequential manner. Advantageously, for example, cost can be reduced, which results in improved efficiency.

[0022] In another preferred embodiment of the first aspect of the invention, the signal receiver includes the tracking generator. Alternatively or concurrently, the tracking generator is integrated into the signal receiver. Advantageously, for example, this can reduce production costs.

[0023] Regarding the integration of the tracking generator into the signal receiver, it should be noted that a suitable housing can be provided.

[0024] In another preferred embodiment of the first aspect of the invention, the signal receiver includes the signal source. Alternatively or otherwise, the signal source is integrated into the signal receiver. Advantageously, for example, this allows for reduced production costs.

[0025] According to another preferred embodiment of the first aspect of the invention, particularly for determining the corresponding voltage standing wave ratio at the input and / or the output, the tracking generator uses a swept-frequency signal and / or a broadband modulated signal. Advantageously, for example, not only can accuracy be further improved, but efficiency can also be further improved.

[0026] It should be noted that, in addition to the sweep frequency signal and / or the broadband modulation signal, or as an alternative to the sweep frequency signal and / or the broadband modulation signal, a multi-frequency sound signal may also be used.

[0027] In another preferred embodiment of the first aspect of the invention, the swept frequency signal comprises or is a narrowband signal. Advantageously, for example, this can further reduce inefficiency.

[0028] According to another preferred embodiment of the first aspect of the invention, the swept frequency signal comprises or is a non-step signal. Advantageously, for example, improved efficiency can be achieved.

[0029] According to another preferred embodiment of the first aspect of the invention, the test signal includes or is a modulated signal, preferably a broadband modulated signal. Advantageously, for example, improved accuracy can be achieved.

[0030] According to another preferred embodiment of the first aspect of the invention, the radio frequency test apparatus is used for determining the error vector magnitude and / or in situations where the error vector magnitude is determined. Advantageously, for example, the error vector magnitude can be determined in an unbiased and improved manner.

[0031] Before describing the second aspect of the invention below, it should be noted that all the explanations and advantages of the first aspect of the invention or any preferred embodiment thereof are similarly applicable to the second aspect of the invention or any preferred embodiment thereof.

[0032] According to a second aspect of the invention, a radio frequency (RF) test method with voltage standing wave ratio (VSWR) adjustment is provided for testing a device under test (DUT). The RF test method includes the following steps: providing a test signal to the DUT via an output terminal using a signal source; receiving a received signal from the DUT via an input terminal using a signal receiver; and determining the corresponding VSWR at the input terminal and / or the output terminal using a tracking generator and / or the signal receiver. Furthermore, the method includes one or more of the following steps: pre-equalizing the test signal based on the corresponding VSWR at the output terminal and / or the input terminal using the signal source; and / or post-correcting the received signal based on the corresponding VSWR at the input terminal and / or the output terminal using the signal receiver. Advantageously, not only is the test highly accurate and efficient, but all systematic errors can be compensated for.

[0033] Regarding the aforementioned elements used within the scope of radio frequency testing methods, it should be noted that the elements are, in particular, corresponding elements of a radio frequency testing apparatus according to the first aspect of the invention or any preferred implementation thereof.

[0034] Regarding the voltage standing wave ratio, it should be noted that the voltage standing wave ratio can be understood in particular as the ratio between the corresponding reflected wave and the incident wave, preferably the ratio with frequency.

[0035] Regarding the input terminal and the output terminal, it should be noted that the input terminal and the output terminal can in particular be a combined input-output terminal.

[0036] According to a first preferred embodiment of the second aspect of the invention, the radio frequency testing method further includes the step of using a swept frequency signal and / or a broadband modulated signal, particularly for determining the corresponding voltage standing wave ratio at the input and / or the output using the tracking generator. Advantageously, for example, not only can accuracy be further improved, but efficiency can also be further improved.

[0037] It should be noted that, in addition to the sweep frequency signal and / or the broadband modulation signal, or as an alternative to the sweep frequency signal and / or the broadband modulation signal, a multi-frequency sound signal may also be used.

[0038] In a second preferred embodiment of the second aspect of the invention, the swept frequency signal comprises or is a narrowband signal. Advantageously, for example, this can further reduce inefficiency.

[0039] According to another preferred embodiment of the second aspect of the invention, the swept frequency signal comprises or is a non-step signal. Advantageously, for example, improved efficiency can be achieved. Attached Figure Description

[0040] The above aspects and implementations of the present invention will be explained in the following description of specific embodiments with reference to the accompanying drawings, wherein:

[0041] Figure 1 A first exemplary embodiment of the first aspect of the present invention is shown;

[0042] Figure 2 A second exemplary embodiment of the first aspect of the present invention is shown;

[0043] Figure 3 A third exemplary embodiment of the first aspect of the present invention is shown; and

[0044] Figure 4 A flowchart illustrating an exemplary embodiment of the second aspect of the present invention is shown. Detailed Implementation

[0045] about Figure 1 An exemplary embodiment of the radio frequency test apparatus 10 of the present invention with voltage standing wave ratio adjustment for testing device under test 11 is described.

[0046] according to Figure 1 The radio frequency test apparatus 10 includes: an input terminal 12; an output terminal 13; a signal source (SRC) 14, which provides test signals to the device under test (DUT) 11 through the output terminal 13, thereby forming an output signal path 15; a signal receiver (SNK) 16, which receives received signals from the device under test through the input terminal 12, thereby forming an input signal path 17; and a tracking generator (TG) 18.

[0047] In this configuration, the tracking generator 18 and / or signal receiver 16 are configured to determine the corresponding voltage standing wave ratio (VSWR) at input 12 and / or output 13. Furthermore, the signal source 14 is configured to pre-equalize the test signal based on the corresponding VSWR at output 13 and / or input 12. Alternatively, the signal receiver 16 is configured to perform post-correction on the received signal based on the corresponding VSWR at input 12 and / or output 13.

[0048] It should be noted that the aforementioned input terminal 12 may include or be an input port, which is particularly connected to or can be connected to the output terminal 19 of the device under test 11, and the output terminal 19 is preferably an output port. Additionally or alternatively, the aforementioned output terminal 13 may include or be an output port, which is particularly connected to or can be connected to the input terminal 20 of the device under test 11, and the input terminal 20 is preferably an input port. Further additionally or alternatively, the input terminal 12 may be connected to or can be connected to the signal receiver 16, and / or the output terminal 13 may be connected to or can be connected to the signal source 14. In addition or as a further alternative, the input terminal 12 may be connected to or can be connected to the signal source 14, and / or the output terminal 13 may be connected to or can be connected to the signal receiver 16.

[0049] It should also be noted that it can be particularly advantageous if the signal source is configured as a pre-equalized test signal, such that the mismatch error introduced by the output signal path 15 (in particular by all of its parts), especially the system mismatch error, is preferably corrected relative to a reference plane (exemplarily the first reference plane).

[0050] In this case, it is more advantageous that the reference plane (exemplarily a first reference plane) can be located directly at the device under test 11, especially at the input terminal 20 of the device under test 11.

[0051] Furthermore, the signal receiver 16 can be configured to perform post-correction on the received signal, such that mismatch errors introduced by the input signal path 17 (especially by all of its components), particularly system mismatch errors, are preferably corrected relative to a reference plane (exemplarily a second reference plane).

[0052] In this case, the reference plane (exemplarily a second reference plane) can be directly at the device under test 11, especially at the output terminal 19 of the device under test 11.

[0053] As from Figure 1As can be further seen, the radio frequency test apparatus 10 may include at least one additional input terminal (exemplarily additional input terminal 21) and at least one orientation device (exemplarily a first orientation device 22), which is used to preferably connect the at least one additional input terminal (exemplarily additional input terminal 21) to the signal receiver 16 in addition to the input terminal 12.

[0054] It should be noted that all the above explanations regarding input 12 of the RF test apparatus 10 can be similarly applied to the at least one other input (exemplarily another input 21). Corresponding other components, particularly the signal receiver 16 and the tracking generator 18, that interact with the at least one other input (exemplarily another input 21) of the RF test apparatus 10 can be configured accordingly.

[0055] It should also be noted that it can be particularly advantageous if the tracking generator 18 and / or the signal receiver 16 are configured to determine the corresponding voltage standing wave ratios at input 12 and the at least one additional input (exemplarily the additional input 21) in a sequential manner.

[0056] As from Figure 1 As can be further seen, the radio frequency test apparatus 10 may include at least one additional output terminal (exemplarily an additional output terminal 23) and at least one orientation device (exemplarily a second orientation device 24), which is preferably used to connect the at least one additional output terminal (exemplarily an additional output terminal 23) to the signal source 14 in addition to the output terminal 13.

[0057] Regarding the second directional device 24 and the aforementioned first directional device 22, it should be noted that it is particularly advantageous if the first directional device 22 and the second directional device 24 can be connected or linked, especially for signal routing at least with respect to input 12 and output 13, or with respect to input 12, additional input 21, output 13, and additional output 23. Advantageously, the signal receiver 16 and / or the tracking generator 18 is connected to or can be connected to at least input 12 and output 13, or to input 12, additional input 21, output 13, and additional output 23. Further advantageously, the signal source 14 is connected to or can be connected to at least input 12 and output 13, or to input 12, additional input 21, output 13, and additional output 23.

[0058] It should also be noted that all the above explanations regarding the output terminal 13 of the RF test apparatus 10 can be similarly applied to the at least one other output terminal (exemplarily the other output terminal 23). Corresponding other components, especially the signal source 14, that interact with the at least one other output terminal (exemplarily the other output terminal 23) of the RF test apparatus 10 can be configured accordingly.

[0059] It should also be noted that it can be particularly advantageous if the tracking generator 18 is configured to determine the corresponding voltage standing wave ratios at output 13 and the at least one other output (exemplarily another output 23) in a sequential manner.

[0060] like Figure 1 As exemplarily depicted, signal receiver 16 includes a tracking generator 18. In particular, the tracking generator 18 is integrated into signal receiver 16.

[0061] It should be noted that it may be particularly advantageous if the signal receiver 16 includes the signal source 14. Alternatively, the signal source 14 may be advantageously integrated into the signal receiver 16.

[0062] It should also be noted that if the tracking generator 18 uses a sweep frequency signal, especially in order to determine the corresponding voltage standing wave ratio at input 12 and / or output 13, it can be particularly advantageous.

[0063] Regarding the frequency sweep signal, it should be noted that the frequency sweep signal may preferably include a narrowband signal. Alternatively, the frequency sweep signal may include a non-step signal.

[0064] Regarding the aforementioned test signals, it should be noted that the test signals may include, in particular, modulated signals, preferably broadband modulated signals.

[0065] In particular, regarding the modulated signal or the broadband modulated signal, it should be noted that the modulated signal or the broadband modulated signal can be generated by means of signal source 14. Then, the signal or test signal can be transmitted, exemplarily, to the input terminal 20 of the device under test 11 via directional device 24. Subsequently, the corresponding reflected electromagnetic wave at the input terminal 20 of the device under test 11 can be separated by the directional device 24. Furthermore, the corresponding reflected electromagnetic wave can be transmitted to signal receiver 16 via directional device 24 and / or directional device 22. Preferably, the signal receiver 16 and / or tracking generator 18 can have a defined phase relationship with the signal source 14. Furthermore, the signal receiver 16 and / or tracking generator 18 can be configured to process a reference signal. Preferably, the reference signal can be associated with the modulated signal or the broadband modulated signal. Advantageously, the corresponding channel response can be determined, particularly by considering the corresponding voltage standing wave ratio (VSWR) of the reference signal, which can preferably be determined by signal receiver 16 and / or tracking generator 18, wherein the corresponding VSWR exemplarily depends on the corresponding reflected electromagnetic wave.

[0066] In addition, or as an alternative, especially when the first directional device 22 and the second directional device 24 are interconnected by a switch, it should be noted that the test signal, especially the aforementioned modulated signal or broadband modulated signal, can be generated by the signal source 14. Preferably, the switch is connected to the signal source 14. Furthermore, especially based on the corresponding configuration of the switch, the signal source 14 is preferably connected to the input terminal 20 or the output terminal 19 of the device under test 11, such that, according to a first configuration of the switch, the test signal generated by the signal source 14 is transmitted to the input terminal 20 of the device under test 11, and according to a second configuration of the switch, the test signal generated by the signal source 14 is transmitted to the output terminal 19 of the device under test 11. In this case, it is particularly advantageous if the switch is configured such that the aforementioned signal receiver 16 and / or tracking generator 18 can perform corresponding reflection and / or transmission measurements based on the corresponding configuration of the switch. It should also be noted that, particularly according to the third configuration of the switch, the signal source 14 may preferably be connected to the signal receiver 16 and / or the tracking generator 18, thereby providing a reference signal path between the signal source 14 and the signal receiver 16 or the tracking generator 18, wherein the switch may preferably be arranged within the reference signal path, such that a reference signal (exemplarily the reference signal described above) is transmitted to the signal receiver 16 or the tracking generator 18. Regarding the three different configurations of the switch, it should be noted that the switch may preferably be configured to be switchable between the three configurations.

[0067] It should also be noted that the RF test apparatus 10 may be particularly advantageous if used for determining the error vector magnitude and / or in situations where the error vector magnitude is determined.

[0068] Now, about Figure 2 and Figure 3 It should be noted that two further exemplary embodiments of the first aspect of the invention are shown, which are based on... Figure 1 The first exemplary implementation. In this case, the following will not explain the implementation. Figure 2 or Figure 3 Zhongyu Figure 1 The elements used have the same reference numerals in the accompanying drawings. Therefore, the corresponding explanations above apply similarly to these elements.

[0069] according to Figure 2 The second exemplary embodiment of the radio frequency test apparatus 30 of the present invention and Figure 1 The difference is particularly that the test device 30 also includes an additional signal receiver (exemplarily a second signal receiver 25).

[0070] In this case, it can be particularly advantageous if the second signal receiver 25 is used only for testing the device under test 11, while the signal receiver 16 (which may include, in particular, a tracking generator 18) is used only for voltage standing wave ratio (VSWR) regulation. Alternatively, the second signal receiver 25 may additionally or alternatively participate in VSWR regulation.

[0071] according to Figure 3 The third exemplary embodiment of the radio frequency test apparatus 40 of the present invention and Figure 1 The difference lies in that the test apparatus 30 also includes a filter device (FA) 26. The filter device 26 is exemplarily arranged within the input signal path. In other words, the input signal path exemplarily includes the filter device 26. Alternatively or additionally, the output signal path may include such a filter device.

[0072] Regarding the filter device 26, it should be noted that it can be particularly advantageous if the filter device 26 comprises multiple individually activatable filters. In this case, at least two filters of the filter device 26 can be activated. Preferably, the at least two filters can be of different types. Exemplarily, at least one activated filter can be a low-pass filter, and at least one activated filter can be a high-pass filter.

[0073] Therefore, it is particularly advantageous to control the filter device 26, especially according to the desired bandwidth of the input signal path and / or the output signal path, so that at least one low-pass filter and at least one high-pass filter of the filter device 26 are activated.

[0074] Furthermore, regarding filter device 26, it should be noted that it can be particularly advantageous if filter device 26 includes at least one mixer. The at least one mixer can preferably be arranged downstream and / or upstream and / or internally of filter device 26. Moreover, the at least one mixer can preferably be configured to convert corresponding signals downstream and / or upstream and / or internally of filter device 26 into a predetermined frequency band, particularly a predetermined intermediate frequency band.

[0075] at last, Figure 4 A flowchart illustrating an exemplary embodiment of the radio frequency (RF) test method with voltage standing wave ratio (VSWR) adjustment for testing a device under test (DUT) according to the present invention is shown. The first step 100 of the RF test method includes providing a test signal to the DUT through an output terminal using a signal source. Furthermore, the second step 101 includes receiving a received signal from the DUT through an input terminal using a signal receiver. Furthermore, the third step 102 includes determining the corresponding VSWR at the input and / or output terminals using a tracking generator and / or a signal receiver. Then, the fourth step 103 of the RF test method includes pre-equalizing the test signal based on the corresponding VSWR at the output and / or input terminals using a signal source, and / or post-correcting the received signal based on the corresponding VSWR at the input and / or output terminals using a signal receiver.

[0076] While various embodiments of the invention have been described above, it should be understood that they are presented by way of example only and not as limitation. Many changes may be made to the disclosed embodiments based on the information provided herein without departing from the spirit or scope of the invention. Therefore, the breadth and scope of the invention should not be limited by any of the embodiments described above. Rather, the scope of the invention should be defined by the appended claims and their equivalents.

[0077] Although the invention has been described and illustrated with respect to one or more implementations, equivalent changes and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. Furthermore, while a particular feature of the invention may be disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of other implementations, which may be desirable and advantageous for any given or particular application.

Claims

1. A radio frequency (RF) test apparatus with voltage standing wave ratio (VSWR) adjustment for testing a device under test, the RF test apparatus comprising: Input terminal; Output terminal; A signal source, wherein the signal source is used to provide a test signal to the device under test through the output terminal, thereby forming an output signal path; A signal receiver, wherein the signal receiver is used to receive a received signal from the device under test through the input terminal, thereby forming an input signal path; as well as Tracking generator, Wherein, the tracking generator and / or the signal receiver are configured to determine the corresponding voltage standing wave ratio (VSWR) at the input or output terminal, as the ratio of the reflected wave to the incident wave relative to the frequency, and The signal source is configured to pre-equalize the test signal based on the corresponding voltage standing wave ratio at the output or input terminal. The signal receiver is configured to perform post-correction on the received signal based on the corresponding voltage standing wave ratio at the input or the output.

2. The radio frequency testing apparatus according to claim 1, in, The signal source is configured to pre-equalize the test signal so that mismatch errors introduced by the output signal path are corrected relative to a reference plane.

3. The radio frequency testing apparatus according to claim 2, in, The reference plane is located directly at the device under test.

4. The radio frequency testing apparatus according to claim 3, in, The reference plane is located directly at the input end of the device under test.

5. The radio frequency testing apparatus according to claim 1, in, The signal receiver is configured to perform post-correction on the received signal, such that mismatch errors introduced by the input signal path are corrected relative to a reference plane.

6. The radio frequency testing apparatus according to claim 5, in, The reference plane is located directly at the device under test.

7. The radio frequency testing apparatus according to claim 6, in, The reference plane is located directly at the output end of the device under test.

8. The radio frequency testing apparatus according to claim 1, in, The radio frequency testing device also includes: At least one additional input, and At least one directional device, the at least one directional device being used to connect the at least one additional input terminal to the signal receiver in addition to the input terminal.

9. The radio frequency testing apparatus according to claim 8, in, The tracking generator and / or the signal receiver are configured to determine the corresponding voltage standing wave ratios at the input terminal and the at least one additional input terminal in a sequential manner.

10. The radio frequency testing apparatus according to claim 1, in, The radio frequency testing device also includes: At least one additional output terminal, and At least one directional device, the at least one directional device being used to connect the at least one additional output terminal to the signal source in addition to the output terminal.

11. The radio frequency testing apparatus according to claim 10, in, The tracking generator is configured to determine the corresponding voltage standing wave ratios at the output terminal and the at least one other output terminal in a sequential manner.

12. The radio frequency testing apparatus according to claim 1, in, The signal receiver includes the tracking generator, and / or The tracking generator is integrated into the signal receiver.

13. The radio frequency testing apparatus according to claim 1, in, The signal receiver includes the signal source, and / or The signal source is integrated into the signal receiver.

14. The radio frequency testing apparatus according to claim 1, in, To determine the corresponding voltage standing wave ratio at the input and / or the output, the tracking generator uses a swept frequency signal and / or a broadband modulated signal.

15. The radio frequency testing apparatus according to claim 14, in, The frequency sweep signal includes a narrowband signal, or a narrowband signal.

16. The radio frequency testing apparatus according to claim 14, in, The frequency sweep signal includes a non-step signal or a non-step signal.

17. The radio frequency testing apparatus according to claim 1, in, The test signal includes a broadband modulated signal, or a broadband modulated signal.

18. The radio frequency testing apparatus according to claim 1, in, The radio frequency test apparatus is used for determining the error vector magnitude and / or, in the case of determining the error vector magnitude.

19. A radio frequency (RF) test method for testing a device under test with voltage standing wave ratio (VSWR) adjustment, the RF test method comprising the following steps: A signal source provides a test signal to the device under test through its output terminal. The signal is received from the device under test via an input terminal using a signal receiver. The voltage standing wave ratio (VSWR) at the input or output terminal is determined using a tracking generator and / or the signal receiver, as the ratio of the reflected wave to the incident wave relative to the frequency. Using the signal source, the test signal is pre-equalized based on the corresponding voltage standing wave ratio at the output or input terminal. The received signal is post-corrected using the signal receiver based on the corresponding voltage standing wave ratio at the input or output terminal.

20. The radio frequency testing method according to claim 19, in, The radio frequency testing method further includes the following steps: using a swept frequency signal and / or a broadband modulated signal to determine the corresponding voltage standing wave ratio at the input and / or output terminals with the aid of the tracking generator.

21. The radio frequency testing method according to claim 20, in, The frequency sweep signal includes a narrowband signal, or a narrowband signal.

22. The radio frequency testing method according to claim 20, in, The frequency sweep signal includes a non-step signal or a non-step signal.

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