SU1478151A1 - Twelve-pole reflectometer - Google Patents

Abstract

This invention relates to a microwave measurement technique. The purpose of the invention is to improve the measurement accuracy. The reflectometer contains microwave g-ry 1 and 2, power dividers 3 and 4, valves 5 and 6, adder 7, measuring transducer 8, investigated microwave two-port 9, measuring channels 10, each consisting of attenuator 11, microwave detector 12 and a buffer amplifier 13, as well as a switch 14, a DC amplifier 15, a digital voltmeter 16, a control and calculation unit (CCU) 17, a phase calibrator 18, and a phase locked loop (PLL) 19. The signals of G-1 and 2 are frequencies and amplitudes through dividers 3 and 4 and valves 5 and 6 are fed to the adder 7. The total signal is Without converter 8 is fed to a two-pole 9 and channels 10. Switch 14 alternately connects channels 10 to amplifier 15, the signal from the output of which via voltmeter 16 goes to VUV 17. It uses calibrator 18 and PLL unit 19 to change the phase relationships of signals g - Levels 1 and 2. The goal is achieved by the introduction of Mr. 2, dividers 3 and 4, gates 5 and 6, adder 7, BUC 17, calibrator 18 and PLL 19. 1 Il.

Description

The invention relates to a technique for measuring at microwave frequencies and can be used to measure circuit parameters and complex reflection coefficients.

The aim of the invention is to improve the measurement accuracy

The drawing shows a structural electrical circuit of a twelve-pole reflectometer.

The twelve pole reflectometer consists of the first and second microwave generators 1 and 2, the first and second power dividers 3 and 4, the first and second valves 5 and 6, the adder 7, the measuring transducer 8, the output of which is the output for connecting the microwave under study two poles 9, four measuring channels 10, each of which contains an attenuator 11, a microwave detector 12 and a buffer amplifier 13, a switch 14, a DC amplifier 15, a digital voltmeter 16, a control and calculation unit 17, a phase calibrator 18 and a unit 19 phase auto Adjustable frequency.

Twelve pole reflectometer works as follows.

Signals of microwave generators 1 and 2 of equal frequency and equal amplitude through dividers 3 and 4 of power and gates 5 and 6 are fed to adder 7. The total signal through Twelve-pole measuring converter 8 is fed to the studied microwave two-port 9. Four outputs of measuring converter 8 connected to the four inputs of the switch 14 with identical measuring channels 10. The switch 14 makes alternate connection of the measuring channels 10 to the DC amplifier 15, from which 3 outputs a signal through a digital voltmeter 16 arrives at block 17, which, using the phase calibrator 18, changes the phase relationships of the signals from microwave generators 1 and 2.

When the matched load is connected to the output of the measuring converter 8 instead of the microwave two-terminal 9 under study 9, the switch 14 is set so that the input from the DC amplifier 15 receives a signal from the measuring channel 10 connected to the output wave of the measuring converter 8. Phase 18 calibrator change the phase difference between the signals of the microwave generators 1 and 2 until the signal at the output of the measuring channel 10 becomes zero. Then, by changing the phase separation of the signals of the microwave generators 1 and 2 using the phase calibrator 18, the maximum value of the signal at the output of the measuring channel 10 UMaxc is set, then the phase difference is set at which the signal value is 0.2 UWQKc. After that, by alternately switching 14 measuring channels 10 to the input of DC amplifier 15, the amplitudes of the signals at the outputs of each measuring channel 10 are set similarly. These amplitudes are measured by a digital voltmeter 16 and stored in block 17, they are then used as reference. When connected to the load output instead of the matched load of the calibration loads (or short-circuited load with a variable phase), the amplitudes of the signals at the outputs of the measuring channels 10 change. If they differ from the amplitudes of the reference signals, then block 17 generates control signals for the phase calibrator 18, restoring the amplitudes of the reference signals.

Claims (1)

Invention Formula A twelve pole reflectometer containing the first microwave generator, a digital voltmeter, a measuring transducer, the first output of which is an output for connecting the two-terminal device under study, a switch and a DC amplifier connected in series, the second, third, fourth and fifth outputs of the measuring transducer are connected respectively with the first, second, third and fourth inputs of the switch, the first, second, third and fourth measuring channels, each of which consists of an attenuator, a microwave detector, and a buffer amplifier, characterized in that, in order to improve the measurement accuracy, the first power divider is connected in series, the input of which is connected to the output of the first microwave generator, the first valve and the adder, the output of which is 3114781514 dinene with the input of the measuring trans-second output of the calibrator phase calibrator, is connected in series with the second input of the phase block control unit and computations, auto-tuning, second output Phase Calibrator, Lazy Auto Block - which is connected to the input of the first frequency control, the second microwave gene-microwave generator, the second output of the first rator, the second power divider and the power distributor connected to the third the second valve, the output of which is connecting the input of the phase locked loop It is not connected with the second input of the adder, moreover, the frequency, and the second output of the second delipital voltmeter is connected between the power output and by the DC amplifier and by the input of the phase locked loop input control unit and the calculation of frequency.