Device for expanding field intensity dynamic range of high-power microwave test system

Abstract

The utility model discloses a high-power microwave test system field intensity dynamic range expansion device comprising a horn antenna which is connected with a coupling attenuator; the coupling attenuator is connected with the medium-power fixed attenuation device; the medium-power fixed attenuation device is connected with the programmable attenuator; the programmable attenuator is connected with the detector; the detector is connected with the oscilloscope; the technical problems that when a test system carries out a small field intensity test, an attenuation device needs to be pulled to meet a small signal test, attenuators with different attenuation values need to be frequently replaced when the test system faces different field intensities, and field test is extremely inconvenient are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of microwave testing, and in particular relates to a field intensity dynamic range expansion device for a high-power microwave testing system. Background Art

[0002] High-power microwaves have been rapidly developed driven by the application needs in the fields of national defense, scientific research, and civil use. The most notable features of high-power microwaves are high peak power and wide radiation range. Therefore, the radiation field of high-power microwaves has the notable feature of a large dynamic range of field intensity.

[0003] High power microwave test system is generally as follows Figure 2 As shown, high-power microwaves have high electric field intensity, and antennas are generally used to measure power density for conversion.

[0004] When conducting field strength tests on high-power microwave radiation fields on site, it is necessary to test the field strengths at different locations, as the field strengths vary in size. When testing with high field strengths, the microwave power received by the measurement system is relatively large, and a high-power attenuator is required to attenuate the signal, attenuating the large signal to a small signal. However, the high-power attenuator is a fixed attenuator and the attenuation value cannot be switched, resulting in limited dynamic measurement of high-power microwaves, and the measurement range is directly determined by the dynamic range of the detector. When the test system conducts low-field strength tests, it is necessary to install an attenuation device to meet the small signal test. When faced with different field strengths, attenuators with different attenuation values ​​need to be frequently replaced, making field testing extremely inconvenient. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a field strength dynamic range extension device for a high-power microwave test system to solve the technical problems that when the test system performs a small field strength test, an attenuation device needs to be installed to meet the small signal test, and when facing different field strengths, attenuators with different attenuation values ​​need to be frequently replaced, which makes on-site testing extremely inconvenient.

[0006] The technical solution of the utility model is:

[0007] A device for extending the field intensity dynamic range of a high-power microwave test system comprises a horn antenna, which is connected to a coupling attenuator; the coupling attenuator is connected to a medium-power fixed attenuation device; the medium-power fixed attenuation device is connected to a programmable attenuator; the programmable attenuator is connected to a detector; and the detector is connected to an oscilloscope.

[0008] The medium-power fixed attenuation device includes a microwave switch 1, a 10dB fixed attenuator, a 20dB fixed attenuator and a microwave switch 2; the microwave switch 1 and the microwave switch 2 are both single-pole triple-throw switches; the coupling attenuator output end is connected to the input end of the microwave switch 1; the first output end of the microwave switch 1 is connected to the input end of the 10dB fixed attenuator; the 10dB fixed attenuator output end is connected to the first input end of the microwave switch 2; the second output end of the microwave switch 1 is connected to the second input end of the microwave switch 2; the third output end of the microwave switch 1 is connected to the input end of the 20dB fixed attenuator; the 20dB fixed attenuator output end is connected to the third input end of the microwave switch 2; the output end of the microwave switch 2 is connected to the programmable attenuator.

[0009] The power capacity of the coupling attenuator meets the maximum power upper limit of the horn antenna output, and the coupling attenuator attenuates the received power to meet the power capacity upper limit of the microwave switch one.

[0010] The first microwave switch is a high-power microwave switch, and its power capacity meets the upper limit of the maximum output power of the coupling attenuator.

[0011] The attenuation dynamic range of the programmable attenuator is greater than 10dB, and the upper limit of the power capacity meets the maximum output power requirement of the second microwave switch.

[0012] Beneficial effects of the utility model:

[0013] The utility model adopts a three-level adjustment scheme of "high-power coupling attenuation + medium-power fixed attenuation + low-power attenuation". The first-level high-power attenuation has a small attenuation but a large power capacity, and attenuates the high-power signal to a medium-power signal; the second-level medium-power attenuation uses a switch to switch between three different levels of attenuation, 0dB, 10dB, and 20dB, to achieve 20dB dynamic adjustment and output a low-power signal; the low-power signal can use a programmable attenuator, which can further expand the power measurement range.

[0014] The utility model adopts a coupled attenuator, a microwave switch + a fixed attenuator, and a programmable attenuator to perform three-level dynamic adjustment of the power range to expand the dynamic range of the test system; this solution can achieve high integration of the large dynamic range measurement capability of the high-power microwave field intensity test system, which is convenient for engineering design.

[0015] It solves the technical problems that when the test system performs a small field strength test, it needs to install an attenuation device to meet the small signal test; when facing different field strengths, it needs to frequently replace attenuators with different attenuation values, which makes on-site testing extremely inconvenient. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2The utility model is a schematic diagram of the structure of a high-power microwave testing system of the prior art. DETAILED DESCRIPTION

[0018] A field intensity dynamic range expansion device for a high-power microwave test system comprises a horn antenna, a coupling attenuator, a medium-power fixed attenuation device, a program-controlled attenuator, a detector and an oscilloscope.

[0019] The horn antenna is connected to the coupling attenuator; the coupling attenuator is connected to the medium-power fixed attenuation device; the medium-power fixed attenuation device is connected to the program-controlled attenuator; the program-controlled attenuator is connected to the detector; and the detector is connected to the oscilloscope.

[0020] The medium power fixed attenuation device comprises a microwave switch 1, a 10dB fixed attenuator, a 20dB fixed attenuator and a microwave switch 2; the microwave switch 1 and the microwave switch 2 are both single-pole triple-throw switches.

[0021] The output end of the coupling attenuator is connected to the input end of microwave switch one; the first output end of microwave switch one is connected to the 10dB fixed attenuator; the output end of the 10dB fixed attenuator is connected to the first input end of microwave switch two; the second output end of microwave switch one is connected to the second input end of microwave switch two; the third output end of microwave switch one is connected to the 20dB fixed attenuator; the output end of the 20dB fixed attenuator is connected to the third input end of microwave switch two; the output end of microwave switch two is connected to the programmable attenuator.

[0022] The horn antenna receives the high-power microwave radiation field energy radiated from space and inputs it into the coupling attenuator; the coupling attenuator is a high-power attenuator, and its power capacity meets the upper limit of the maximum power output of the receiving antenna, and attenuates the received power to low power to meet the upper limit of the power capacity of the microwave switch; the first microwave switch is a high-power microwave switch, and its power capacity meets the upper limit of the maximum power output of the coupling attenuator. It selects to output to the through-type, 20dB fixed attenuator, and 10dB fixed attenuator according to the signal size; the second microwave switch is a high-power microwave switch, and selects to receive the output signals of the through-type, 20dB fixed attenuator, and 10dB fixed attenuator according to the signal size; the attenuation dynamic range of the programmable attenuator is greater than 10dB, and the upper limit of the power capacity meets the maximum output power requirement of the second microwave switch; the low-power signal output by the programmable attenuator is envelope-detected by the detector to output a pulse envelope signal, and the pulse envelope model is measured by an oscilloscope, and the energy size of the high-power microwave radiation in space is inferred by calculating the attenuation path and the detector power coefficient.

Claims

1. A device for extending the dynamic range of field intensity of a high-power microwave test system, characterized in that: The device comprises a horn antenna, which is connected to a coupling attenuator; the coupling attenuator is connected to a medium-power fixed attenuation device; the medium-power fixed attenuation device is connected to a programmable attenuator; the programmable attenuator is connected to a detector; and the detector is connected to an oscilloscope.

2. The device for extending the dynamic range of field intensity of a high-power microwave test system according to claim 1, characterized in that: The medium-power fixed attenuation device includes a microwave switch 1, a 10dB fixed attenuator, a 20dB fixed attenuator and a microwave switch 2; the microwave switch 1 and the microwave switch 2 are both single-pole triple-throw switches; the coupling attenuator output end is connected to the input end of the microwave switch 1; the first output end of the microwave switch 1 is connected to the input end of the 10dB fixed attenuator; the 10dB fixed attenuator output end is connected to the first input end of the microwave switch 2; the second output end of the microwave switch 1 is connected to the second input end of the microwave switch 2; the third output end of the microwave switch 1 is connected to the input end of the 20dB fixed attenuator; the 20dB fixed attenuator output end is connected to the third input end of the microwave switch 2; the output end of the microwave switch 2 is connected to the programmable attenuator.

3. The device for extending the dynamic range of field intensity of a high-power microwave test system according to claim 1, characterized in that: The power capacity of the coupling attenuator meets the maximum power upper limit of the horn antenna output, and the coupling attenuator attenuates the received power to meet the power capacity upper limit of the microwave switch one.

4. The device for extending the field intensity dynamic range of a high power microwave test system according to claim 2, characterized in that: The first microwave switch is a high-power microwave switch, and its power capacity meets the upper limit of the maximum output power of the coupling attenuator.

5. The device for extending the field intensity dynamic range of a high power microwave test system according to claim 1, characterized in that: The attenuation dynamic range of the programmable attenuator is greater than 10dB, and the upper limit of the power capacity meets the maximum output power requirement of the second microwave switch.

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