Measuring device for radio frequency attenuation value and insertion loss value

Abstract

The utility model discloses a device for measuring a radio frequency attenuation value and an insertion loss value, which relates to the field of radio frequency testing and specifically comprises a radio frequency power divider and a dual-channel radio frequency power meter connected with the radio frequency power divider through a first radio frequency coaxial cable assembly and a second radio frequency coaxial cable assembly. The first radio frequency coaxial cable assembly comprises two first radio frequency coaxial cables and a radio frequency coaxial connector, the outer end of one first radio frequency coaxial cable is connected with the radio frequency power divider, and the outer end of the other first radio frequency coaxial cable is connected with the dual-channel radio frequency power meter; the second radio frequency coaxial cable assembly comprises two second radio frequency coaxial cables, a tested device is connected between the two second radio frequency coaxial cables, the outer end of one second radio frequency coaxial cable is connected with the radio frequency power divider, the other second radio frequency coaxial cable is connected with the dual-channel radio frequency power meter, and the dual-channel radio frequency power meter is connected with the tested device. Only parameters of output signals need to be adjusted, and the operation process is simplified.

Description

Technical Field

[0001] The utility model relates to the field of radio frequency testing, in particular to a device for measuring radio frequency attenuation values ​​and insertion loss values. Background Art

[0002] The attenuation value of the RF attenuator and the insertion loss value of the RF current probe are important parameters of these two types of passive RF devices. Their size directly affects the size of the RF electromagnetic wave signal propagated in the entire RF test system. Accurately measuring the attenuation value and insertion loss value and compensating them to the entire RF test system is crucial to accurately measuring the RF electromagnetic wave signal of the entire RF test system.

[0003] The measurement of attenuation and insertion loss values ​​generally adopts the measurement method of combining an RF signal source and a receiver. The measurement steps of this method are divided into two steps. The first step is to connect the RF signal source and the receiver through a standard coaxial cable, adjust the receiver parameters, and read a measurement data. The second step is to connect the RF device under test between the standard coaxial cable and the receiver in the first step to obtain the second measurement data. Subtracting the measurement data obtained in the two steps is the attenuation value or insertion loss value of the RF device under test.

[0004] The above method requires repeated setting of the signal output frequency and amplitude of the RF signal source and the measurement frequency, measurement bandwidth, measurement time, internal attenuation value and other parameters of the receiver, which is relatively cumbersome. Utility Model Content

[0005] The utility model provides a device for measuring radio frequency attenuation value and insertion loss value, so as to solve the problem that the existing measuring method is complicated in operation.

[0006] The utility model discloses a device for measuring radio frequency attenuation value and insertion loss value, which adopts the following technical scheme: the device comprises: a radio frequency power distributor and a dual-channel radio frequency power meter connected to the radio frequency power distributor through a first radio frequency coaxial cable assembly and a second radio frequency coaxial cable assembly; the dual-channel radio frequency power meter comprises a first channel and a second channel;

[0007] The first RF coaxial cable assembly includes two first RF coaxial cables and a RF coaxial connector connecting the two first RF coaxial cables, the outer end of one first RF coaxial cable is connected to the RF power distributor, and the outer end of the other first RF coaxial cable is connected to the dual-channel RF power meter via the first channel;

[0008] The second RF coaxial cable assembly includes two second RF coaxial cables, which are used to connect the device under test. The outer end of one second RF coaxial cable is connected to the RF power divider, and the other second RF coaxial cable is connected to the dual-channel RF power meter via the second channel.

[0009] Preferably, the first RF coaxial cable is identical to the second RF coaxial cable.

[0010] Preferably, the frequency range of the RF power divider is 9 kHz to 1 GHz; the frequency range of the dual-channel RF power meter is 9 kHz to 1 GHz.

[0011] Preferably, the second RF coaxial cable connected to the RF power distributor is connected to the input end of the device under test, and the second RF coaxial cable connected to the dual-channel RF power meter is connected to the output end of the device under test.

[0012] Preferably, the dual-channel radio frequency power meter comprises a display screen.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. In the utility model, the RF power divider can ensure that the frequency and amplitude of the two output RF signals are exactly the same. The signal through the first RF coaxial cable assembly enters the first channel of the dual-channel RF power meter, replacing the first step of the method of measuring with a combination of an RF signal source and a receiver. Since the RF power divider is used to measure the average power of the RF signal, there is no need to adjust its receiving frequency to obtain the RF signal amplitude. There is no need to adjust the measurement frequency, measurement bandwidth, measurement time and internal attenuation value of the receiver according to the frequency and amplitude of the output signal of the signal source like a receiver. Instead, only the parameters of the output signal need to be adjusted, which simplifies the operation process. In addition, the device under test is installed on the second channel of the dual-channel RF power meter, and the amplitude of the attenuated RF signal can be obtained through the reading of the second channel. The attenuation value or insertion loss value of the device under test can be obtained by subtracting the amplitude values ​​obtained from the first channel and the second channel on the dual-channel RF power meter. The utility model changes the two-step measurement into a one-step measurement, simplifies the operation steps, and is suitable for promotion and use in electromagnetic compatibility laboratories that do not have vector network analyzers.

[0015] 2. In the present invention, the radio frequency coaxial cable can eliminate the measurement system error introduced by the cable attenuation and improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0018] Description of Reference Numerals

[0019] 1. RF power distributor; 2. First RF coaxial cable assembly; 3. Second RF coaxial cable assembly; 4. Dual-channel RF power meter; 21. First RF coaxial cable; 22. RF coaxial connector; 31. Second RF coaxial cable; 41. First channel; 42. Second channel; 43. Display screen. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] An embodiment of a device for measuring radio frequency attenuation value and insertion loss value of the utility model is as follows: Figure 1 As shown, the device includes: a radio frequency power distributor 1 and a dual-channel radio frequency power meter 4 connected to the radio frequency power distributor 1 through a first radio frequency coaxial cable assembly 2 and a second radio frequency coaxial cable assembly 3; the dual-channel radio frequency power meter 4 includes a first channel 41 and a second channel 42;

[0022] The first RF coaxial cable assembly 2 includes two first RF coaxial cables 21 and a RF coaxial connector 22 connecting the two first RF coaxial cables 21, the outer end of one first RF coaxial cable 21 is connected to the RF power distributor 1, and the outer end of the other first RF coaxial cable 21 is connected to the dual-channel RF power meter 4 via the first channel 41;

[0023] The second RF coaxial cable assembly 3 includes two second RF coaxial cables 31, which are used to connect the device under test. The outer end of one second RF coaxial cable 31 is connected to the RF power distributor 1, and the other second RF coaxial cable 31 is connected to the dual-channel RF power meter 4 via the second channel 42.

[0024] In this embodiment, it should be noted that the model of the RF power distributor 1 is PE2003, the model of the first RF coaxial cable 21 and the second RF coaxial cable 31 is RG58, the model of the dual-channel RF power meter 4 is HP355, and the model of the RF coaxial connector 22 is PE9106.

[0025] In this embodiment, it should be noted that the device under test is a RF attenuator or a RF current probe. When the device under test is a RF attenuator, the measuring device can measure the attenuation value of the RF attenuator. When the device under test is a RF current probe, the measuring device can measure the insertion loss value of the RF current probe.

[0026] When this embodiment is used, it is necessary to provide a 12V DC power supply to the dual-channel RF power meter 4, connect the RF signal source to the input port (external end) of the RF power distributor 1, and set the RF signal source to output the RF signal of the measured frequency point to ensure that the signal frequency and amplitude should be within the range of the dual-channel RF power meter 4;

[0027] The input end of the device under test is connected to the inner end of the second RF coaxial cable 31 connected to the RF power divider 1, and the output end is connected to the second RF coaxial cable 31 connected to the dual-channel RF power meter 4. The measurement data of the first channel 41 on the dual-channel RF power meter 4 is read as V1 (dBm), and the measurement data of the second channel 42 is read as V2 (dBm). Then, the attenuation value of the device under test, i.e., the RF attenuator or the insertion loss value of the RF current probe at this frequency point is V1-V2 (dB);

[0028] According to the above method, the output frequency of the RF signal source is adjusted as needed, the readings of the first channel 41 and the second channel 42 on the dual-channel RF power meter 4 are read, and the attenuation value of the RF attenuator or the insertion loss value of the RF current probe at the corresponding frequency point can be obtained by subtracting them.

[0029] In this embodiment, the first RF coaxial cable 21 is the same as the second RF coaxial cable 31 .

[0030] In this embodiment, it should be noted that the first RF coaxial cable 21 and the second RF coaxial cable 31 have the same model, material, length, etc. to eliminate system errors.

[0031] In this embodiment, the frequency range of the RF power distributor 1 is 9 kHz to 1 GHz; the frequency range of the dual-channel RF power meter 4 is 9 kHz to 1 GHz.

[0032] In this embodiment, the second RF coaxial cable 31 connected to the RF power distributor 1 is connected to the input end of the device under test, and the second RF coaxial cable 31 connected to the dual-channel RF power meter 4 is connected to the output end of the device under test.

[0033] In this embodiment, it should be noted that the RF attenuator has an input end and an output end. Therefore, when the device under test is a RF attenuator, the second RF coaxial cable 31 connected to the RF power distributor 1 can be directly connected to the input end of the RF attenuator, and the second RF coaxial cable 31 connected to the dual-channel RF power meter 4 can be directly connected to the output end of the RF attenuator, thereby measuring the attenuation value of the RF attenuator.

[0034] In this embodiment, it should be further explained that the RF current probe has only an input end. Therefore, when the device under test is an RF current probe, it is necessary to install a matching calibration fixture for the RF current probe. The second RF coaxial cable 31 connected to the RF power distributor 1 is connected to the input end of the RF current probe, and the second RF coaxial cable 31 connected to the dual-channel RF power meter 4 is connected to the output end of the calibration fixture of the RF current probe, so as to measure the insertion loss value of the RF current probe.

[0035] In this embodiment, the dual-channel radio frequency power meter 4 includes a display screen 43 .

[0036] In this embodiment, it should be noted that the specific values ​​of V1 and V2 can be directly displayed on the display screen 43 .

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring radio frequency attenuation value and insertion loss value, characterized in that: The invention comprises a radio frequency power distributor (1) and a dual-channel radio frequency power meter (4) connected to the radio frequency power distributor (1) via a first radio frequency coaxial cable assembly (2) and a second radio frequency coaxial cable assembly (3); the dual-channel radio frequency power meter (4) comprises a first channel (41) and a second channel (42); The first radio frequency coaxial cable assembly (2) comprises two first radio frequency coaxial cables (21) and a radio frequency coaxial connector (22) connecting the two first radio frequency coaxial cables (21); the outer end of one of the first radio frequency coaxial cables (21) is connected to the radio frequency power distributor (1), and the outer end of the other first radio frequency coaxial cable (21) is connected to the dual-channel radio frequency power meter (4) via the first channel (41); The second radio frequency coaxial cable assembly (3) comprises two second radio frequency coaxial cables (31), the two second radio frequency coaxial cables (31) being used to connect the device under test, the outer end of one second radio frequency coaxial cable (31) being connected to the radio frequency power distributor (1), and the other second radio frequency coaxial cable (31) being connected to the dual-channel radio frequency power meter (4) via the second channel (42).

2. The device for measuring radio frequency attenuation and insertion loss according to claim 1, characterized in that: The first radio frequency coaxial cable (21) is the same as the second radio frequency coaxial cable (31).

3. The device for measuring radio frequency attenuation and insertion loss according to claim 1, characterized in that: The frequency range of the radio frequency power distributor (1) is 9 kHz to 1 GHz; the frequency range of the dual-channel radio frequency power meter (4) is 9 kHz to 1 GHz.

4. The device for measuring radio frequency attenuation and insertion loss according to claim 1, characterized in that: The second radio frequency coaxial cable (31) connected to the radio frequency power distributor (1) is connected to the input end of the device under test, and the second radio frequency coaxial cable (31) connected to the dual-channel radio frequency power meter (4) is connected to the output end of the device under test.

5. The device for measuring radio frequency attenuation and insertion loss according to claim 1, characterized in that: The dual-channel radio frequency power meter (4) comprises a display screen (43).

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