SU1666974A1 - Measurer for moduli of reflection and transfer coefficients - Google Patents

Abstract

This invention relates to a microwave technique. The purpose of the invention is to improve the measurement accuracy. The transmitter and reflection module meter contains a digital-to-analog converter 1, an amplifier 2, a tunable frequency generator 3, a controlled attenuator 4, a directional coupler 5, a microwave device 6 under study, first and second amplitude detectors 7 and 9, a fixed memory block 18, measuring unit 19. The goal is achieved by introducing tee 12, dual tee 13, third and fourth amplitude detectors 15 and 16, ratio meter 17, delay line 14, switch 8. 1 sludge.

Description

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The invention relates to a microwave technique and can be used in measuring the moduli of the transmittance and reflection coefficients of microwave devices.

The purpose of the invention is to improve the measurement accuracy.

The drawing shows a structural electrical circuit for measuring the coefficient of transmission and reflection modules.

The transmitter and reflection module meter contains serially connected digital-to-analog converter (DAC) 1, amplifier 2 and tunable frequency generator (THD), serially connected controlled attenuator 4, first directional coupler (NO) 5, microwave 6 under study first amplitude selector 7 and switch 6, second amplitude detector 9, amplifier 10 automatic power control, second HO 11, tee 12, double tee 13, delay line 14, third 15 and fourth 16 amplitude detectors rs, gauge 17 ratios, block 18 of permanent memory, gauge block 19, and short-circuit 20.

The meter for the transmit and reflectance modules works as follows,

Microwave signal with HPC 3 through BUT 11, controlled attenuator 4, BUT 5 is fed to the studied microwave device 6, and after detecting the output signal from it in the amplitude detector 7, the latter is fed through switch 8 to the analog input of the measuring unit 9. By value The output signal of the amplitude detector 7 is determined by the magnitude of the transmission coefficient of the microwave device under study. At the same time, a part of the signal from the GPG 3 is branched into the NL 11 and is fed to the input of the tee 12. From the first and second outputs of this tee, the signals divided in half are fed to the inputs of the double tee 13, one of which goes to the first input, and the second one is delayed in phase line 14 delay, at the second entrance. The output signals of the double tee 13 are detected by amplitude detectors 15 and 16 and are fed to a relationship meter 17. The dependence of the output voltage of the relationship meter 17 on the frequency of the VLR is recorded when the meter of the coefficient of transmission and reflection models is tuned to a fixed memory block 18. If, as a result of destabilizing factors, the frequency of the HPG changes and does not correspond to the code set for this frequency in block 18 of the fixed frame, is determined by measuring unit 19 from the expression Pk Vui + U $ where

In the meantime, a differential voltage appears at the inputs of amplifier 2, which changes the frequency of the VLT before. until the output of the 17 relationship meter is established

voltage equal to the output voltage of the DAC 1 and equal to the one that was set when programming the memory block. This is how the frequency of the THB is adjusted and, therefore,

0, the measurement accuracy of the transmit and reflectance modules is improved.

In the microwave power measurement mode using the proposed device, the short connector 20 is removed, and the measured microwave signal 5 is fed directly to the input of the tee 12. The value of the measured signal

Tsh

Ui, 1) 2 is the voltage across the outputs of the third and 0 fourth amplitude detectors 15 and 16; k - coefficient of proportionality.

Claims (1)

Invention Formula Ratio Meter 5 transmission and reflection, containing serially connected block of constant memory, digital-analogue converter, amplifier and tunable frequency generator, serially connected 0 controlled attenuator, the first directional coupler, the microwave device under study and the first amplitude detector, the second output of the first directional coupler is connected to the second input of the controlled attenuator by the second amplitude of the capacitive detector to the input of the unit fixed memory, characterized in that, with 0 to improve measurement accuracy, a tee connected in series, a double tee, a third amplitude detector, and a ratio meter, the output of which is connected to a control 5 input amplifier line delay, the input of which is connected to the second output of the tee, and the output is connected to the second input of the double tee, the fourth amplitude detector, the input of which is connected to 0 to the second output of the double tee, and the output is connected to the second input of the ratio meter, the switch, the first input of which is connected to the output of the first amplitude detector, the second input sub5 keys to the output of the fourth amplitude detector, the third input is connected to the output of the third amplitude detector, the output is connected to the analog the input of the measuring unit, and the control input is connected to the digital input-output of the measuring 516669746 unit, and the second directional coupler, the stroke is connected to the input of the controlled attribute, the input of which is connected to the output of the generator, and the second output is connected to the input of the tunable frequency torus, the first peak.