Spread spectrum module of vector network analyzer

Abstract

The utility model relates to the technical field of communication test equipment, and discloses a spread spectrum module of a vector network analyzer, which comprises a transmitting module and a receiving module, the transmitting module comprises a first frequency multiplier, the output end of the first frequency multiplier is connected with an adjustable attenuator, the output end of the adjustable attenuator is connected with an isolator, and the isolator is connected with a second frequency multiplier. The output end of the isolator is connected with a directional coupler, the coupling end of the directional coupler is connected with a first frequency mixer, the local oscillation end of the first frequency mixer is connected with a second frequency multiplier, and the intermediate frequency end of the first frequency mixer is the down-conversion output end of the transmitting module; the receiving module comprises a fixed attenuator used for receiving the radio frequency signals output by the transmitting module, the output end of the fixed attenuator is connected with a second frequency mixer, and the local oscillation end of the second frequency mixer is connected with a third frequency multiplier; according to the utility model, the circuit structure is simplified and the cost is reduced while the high-dynamic and high-directivity rating of the S21 transmission coefficient test is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of communication test equipment, in particular to a spectrum spreading module of a vector network analyzer. Background Art

[0002] Millimeter wave frequencies have shorter signal wavelengths, enabling smaller and lighter devices while offering wider frequency bands and greater capacity. These advantages give millimeter wave technology significant advantages in precision guidance, radio frequency reconnaissance, radar remote sensing, meteorological research, and modern communications systems.

[0003] To meet the testing requirements of the millimeter wave band, it is usually necessary to use existing conventional microwave band RF instruments and use frequency extension modules to upgrade the RF to the millimeter wave band. This can fully utilize existing measurement instrument resources and reduce equipment costs.

[0004] However, most existing vector network analyzers are used to test the S21 transmission coefficient. The spread spectrum module of the vector network analyzer has the problems of complex structure and high cost in testing the S21 transmission coefficient. Utility Model Content

[0005] The utility model aims to provide a spectrum spreading module for a vector network analyzer which ensures high dynamic and high directivity ratings of an S21 transmission coefficient test, simplifies the circuit structure and reduces the cost.

[0006] The utility model is achieved in this way:

[0007] A spread spectrum module for a vector network analyzer includes a transmitting module and a receiving module, the transmitting module including a first frequency multiplier, the output end of the first frequency multiplier connected to an adjustable attenuator, the output end of the adjustable attenuator connected to an isolator, the output end of the isolator connected to a directional coupler, the output end of the directional coupler serving as the radio frequency output end of the transmitting module, the coupling end of the directional coupler connected to a first mixer, the local oscillator end of the first mixer connected to a second frequency multiplier, and the intermediate frequency end of the first mixer serving as the down-conversion output end of the transmitting module;

[0008] The receiving module includes a fixed attenuator for receiving the radio frequency signal output by the transmitting module, the output end of the fixed attenuator is connected to a second mixer, the local oscillator end of the second mixer is connected to a third frequency multiplier, and the intermediate frequency end of the second mixer is the down-conversion output end of the receiving module.

[0009] Furthermore, the radio frequency range of the first mixer and the second mixer is 220 GHz-330 GHz.

[0010] Furthermore, the adjustable attenuator has an adjustment range of 0-30dB.

[0011] Furthermore, the coupling value of the directional coupler is 10 dB.

[0012] Furthermore, the attenuation value of the fixed attenuator is 10 dB.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] In practical applications, the first frequency multiplier is an 18th-order frequency multiplier, which transmits the signal to the adjustable attenuator, which is a J-band manually adjustable attenuator. The adjustable attenuator transmits the signal to the directional coupler through the isolator, and the output end of the directional coupler is used as an RF signal output. The coupling end of the directional coupler is connected to the RF end of the first mixer, wherein the isolator is a J-band isolator, the directional coupler is a J-band single directional coupler, the first mixer is a subharmonic mixer, and the first mixer uses the signal input by the second frequency multiplier as local oscillator excitation. The second frequency multiplier is a 12th-order frequency multiplier. The first mixer down-converts the input RF signal into an intermediate frequency signal and outputs it through the down-conversion output end of the transmitting module; the receiving module The fixed attenuator of the block receives the RF signal output by the transmitting module and transmits it to the second mixer. The fixed attenuator is a J-band fixed attenuator. The second mixer is a subharmonic mixer. The second mixer uses the signal input by the third frequency multiplier as local oscillator excitation to down-convert the input RF signal into an intermediate frequency signal and output it from the down-conversion output end of the receiving module. The third frequency multiplier is a 12th-order frequency multiplier. The utility model can quickly realize the measurement of the S21 transmission coefficient of 220GHz-330GHz devices, eliminates the intermediate frequency test channel at the transmitting end and the reference channel at the receiving end, simplifies the circuit structure, saves a lot of costs, and has high dynamics and high directionality, ensuring the test scenarios of various S21 transmission coefficients. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the circuit structure of the utility model;

[0017] Figure 2 This is the curve of the output power of the transmitter module of the utility model in the range of 220GHz-330GH;

[0018] Figure 3It is the dynamic range curve of the utility model;

[0019] Figure 4 It is a structural diagram of the connection relationship between the utility model and a vector network analyzer.

[0020] Reference numerals: first frequency multiplier 1; adjustable attenuator 2; isolator 3; directional coupler 4; first frequency mixer 5; second frequency multiplier 6; fixed attenuator 7; second frequency multiplier 8; third frequency multiplier 9. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 and Figure 4 A spectrum spread module of a vector network analyzer includes a transmitting module and a receiving module, the transmitting module includes a first frequency multiplier 1, the output end of the first frequency multiplier 1 is connected to an adjustable attenuator 2, the output end of the adjustable attenuator 2 is connected to an isolator 3, the output end of the isolator 3 is connected to a directional coupler 4, the output end of the directional coupler 4 is the RF output end of the transmitting module, the coupling end of the directional coupler 4 is connected to a first mixer 5, the local oscillator end of the first mixer 5 is connected to a second frequency multiplier 6, and the intermediate frequency end of the first mixer 5 is the down-conversion output end of the transmitting module;

[0023] The receiving module includes a fixed attenuator 7 for receiving the radio frequency signal output by the transmitting module. The output end of the fixed attenuator 7 is connected to a second mixer 8. The local oscillator end of the second mixer 8 is connected to a third frequency multiplier 9. The intermediate frequency end of the second mixer 8 is the down-conversion output end of the receiving module.

[0024] In practical applications, the first frequency multiplier 1 is an 18th-order frequency multiplier. The first frequency multiplier 1 transmits the signal to the adjustable attenuator 2, which is a J-band manually adjustable attenuator. The adjustable attenuator 2 transmits the signal to the directional coupler 4 through the isolator 3. The output end of the directional coupler 4 is used as a radio frequency signal output. The coupling end of the directional coupler 4 is connected to the radio frequency end of the first mixer 5, wherein the isolator 3 is a J-band isolator, the directional coupler 4 is a J-band single directional coupler, the first mixer 5 is a subharmonic mixer, and the first mixer 5 uses the signal input by the second frequency multiplier 6 as local oscillation excitation. The second frequency multiplier 6 is a 12th-order frequency multiplier. The first mixer 5 down-converts the input radio frequency signal into an intermediate frequency signal and outputs it through the down-conversion output end of the transmitting module. Output; the fixed attenuator 7 of the receiving module receives the RF signal output by the transmitting module and transmits it to the second mixer 8, the fixed attenuator 7 is a J-band fixed attenuator, the second mixer 8 is a subharmonic mixer, and the second mixer 8 uses the signal input by the third frequency multiplier 9 as local oscillation excitation to down-convert the input RF signal into an intermediate frequency signal and output it from the down-conversion output end of the receiving module, and the third frequency multiplier 9 is a 12th-order frequency multiplier; the utility model can quickly realize the measurement of the S21 transmission coefficient of 220GHz-330GHz devices, eliminates the intermediate frequency test channel at the transmitting end and the reference channel at the receiving end, simplifies the circuit structure, saves a lot of costs, and has high dynamics and high directionality, ensuring the test scenarios of various S21 transmission coefficients.

[0025] The radio frequency range of the first mixer 5 and the second mixer 8 is 220 GHz-330 GHz.

[0026] The adjustment range of the adjustable attenuator 2 is 0-30dB.

[0027] The coupling value of the directional coupler 4 is 10 dB.

[0028] The attenuation value of the fixed attenuator 7 is 10 dB.

[0029] See also Figures 2 to 3 ,in Figure 2 The output power curve of the transmitter module in the range of 220GHz-330GHz is shown in the figure, and the output power is about -5dBm in the whole frequency band. Figure 3 The attenuation range from the maximum value to the minimum value that can be measured at a specified frequency in the range of 220 GHz to 330 GHz of the present invention is shown in FIG.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A spectrum spread module for a vector network analyzer, characterized in that: The invention comprises a transmitting module and a receiving module, wherein the transmitting module comprises a first frequency multiplier (1), the output end of the first frequency multiplier (1) is connected to an adjustable attenuator (2), the output end of the adjustable attenuator (2) is connected to an isolator (3), the output end of the isolator (3) is connected to a directional coupler (4), the output end of the directional coupler (4) is the radio frequency output end of the transmitting module, the coupling end of the directional coupler (4) is connected to a first mixer (5), the local oscillator end of the first mixer (5) is connected to a second frequency multiplier (6), and the intermediate frequency end of the first mixer (5) is the down-conversion output end of the transmitting module; The receiving module comprises a fixed attenuator (7) for receiving the radio frequency signal output by the transmitting module, the output end of the fixed attenuator (7) is connected to a second mixer (8), the local oscillator end of the second mixer (8) is connected to a third frequency multiplier (9), and the intermediate frequency end of the second mixer (8) is the down-conversion output end of the receiving module.

2. The spectrum spreading module of a vector network analyzer according to claim 1, characterized in that: The radio frequency range of the first mixer (5) and the second mixer (8) is 220 GHz-330 GHz.

3. The spectrum spreading module of a vector network analyzer according to claim 1, characterized in that: The adjustable attenuator (2) has an adjustment range of 0-30dB.

4. The spectrum spreading module of a vector network analyzer according to claim 1, characterized in that: The coupling value of the directional coupler (4) is 10 dB.

5. The spectrum spreading module of a vector network analyzer according to claim 1, characterized in that: The attenuation value of the fixed attenuator (7) is 10dB.

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