SU1633367A1 - Method of determining modulus and phase of two-terminal shf device reflection factor - Google Patents

Abstract

The invention relates to the technique of measurements on the microwave. The purpose of the invention is to improve the accuracy and performance of measurements. The diagram shows microwave rc 1, double-shouldered divider 2 of power, segments 3 and 4 of the transmission line with longitudinal targets, unaligned probes 5 and 6, carriages 7 and 8, the two-terminal 9 under study, matched load 10, phase meter 11 and mechanism 12 synchronous movement. The signal of Mr. 1 splits into two directions and its branches through segments 3 and 4 arrive at two-terminal 9 and load 10, and through probes 5 and 6, installed on synchronously mixing carriages 7 and 8, arrive at a phase meter 11. It measures the maximum deviation of the phase shift from zero, which is uniquely associated with the coefficient module. reflect a given dependence. To measure the phase coefficient. reflections use an exemplary short-circuit duncher, at which the position corresponding to the zero value of the phase shift is fixed. Then, the bipolar 9 under study is connected to segment 3 and the magnitude of this minimum displacement is determined. From this value, the phase coefficient is determined by f-le. reflections. 1 il. (L 05 CO with so O Oh sj

Description

This invention relates to a microwave measurement technique.

The purpose of the invention is to improve the accuracy and performance of measurements.

The drawing shows a structural electrical circuit diagram of a device that implements a method for determining the phase modulus of the reflection coefficient of a microwave two pole.

The device contains a microwave generator 1, a double-shouldered divider 2, the power of the first 3 and second 4 segments of the transmission line, in the walls of which longitudinal slits are cut, in which directional movable probes 5 and 6 are installed with the possibility of longitudinal synchronous movement. and 6 is carried out with the help of the first 7 and second 8 carriages, on which omnidirectional probes 5 and 6 are placed, to the output of the first segment 3 of the transmission line is connected either an exemplary short-circuiter, which is an exemplary bipolar ohm, or the studied two-port 9, to the output of the second segment 4 of the transmission line are connected a matched load 10, a phase meter 11, the reference and measurement inputs of which are connected respectively to the outputs of the omnidirectional probes 6 and 5, the movement of the carriages 7 and 8 is carried out using the mechanism 12 synchronous movement .

The method for determining the modulus and phase of the reflection coefficient of a microwave bipolar is implemented as follows.

The harmonic signal from the microwave generator 1 is branched by a two-arm power divider 2 into two directions. Branched signals through segments 3 and 4 of the transmission line arrive at the studied microwave bipolar 9 and the matched load 10. In this case, in section 3 of the transmission line, in general, the mode of mixed waves is formed due to reflection from the studied microwave bipolar 9, 4, transmission lines form a traveling wave mode, since the reflection coefficient of the matched load 10 is zero. The non-directional probes 5 and 6, entered into the slots of segments 3 and 4 of the transmission line, carry out non-directional branching of the signals. Branched harmonic signals from the outputs

five

0

five

non-directional probes 5 and 6 are fed to the measuring and reference inputs of the phase meter 11, respectively. Phase meter 11 measures the phase shift of AFmax between the harmonic signals of the same frequency, arriving at the measuring and reference inputs. The operator using the synchronous movement mechanism 12 performs synchronous movement of the carriages 7 and I, on which probes 5 and 6 are mounted. is uniquely associated with the reflection coefficient modulus. The maximum deviation of the phase shift is measured using a phase meter 11, then the modulus of the reflection coefficient of the microwave bipolar 9 is determined by the formula

I p I -fc8

- +

0

five

0

five

0

five

where d. C)

Max

- The maximum deviation of the phase shift. To measure the phase of the reflection coefficient, an exemplary two-port short circuit connector is connected to the output of segment 3 of the transmission line. Moving with the help of the mechanism 12 of the synchronous movement of the carriage 7 and 8, the position corresponding to the zero value of the phase shift is fixed by the accountable device of the mechanism 12 for the longitudinal movement. Then, the examined microwave two-pole 9 is connected to the output of section 3 of the transmission line and the magnitude of the displacement of this position U1 is determined. Thereafter, the phase value of the reflection coefficient is determined by the formula.

H V + A1

where D is the wavelength in the line segment

transfer,

moreover, the plus sign is taken in the case of displacement towards the generator, and the minus sign is taken to the two-terminal network.

Claims (1)

Invention Formula The method of determining the modulus and phase of the reflection coefficient of the microwave two-port network consists in excitation of the harmonic transmission line and measurement of the signal parameters of the branch line and the transmission line using a movable probe when connected to the output of the transmission line of the studied two-terminal device, characterized in that and measurement performance, additionally form a reference signal, the initial phase of which varies linearly synchronously with the movement of the movable probe, the phases are measured The new shift between the branched and reference signals determines the maximum deviation of the phase shift Df max relative to the zero hour 10 15 the zero value of the phase shift relative to the reference plane in the short circuit mode, calculate the modulus and phase of the reflection coefficient by the formulas I f - rg () l H-tga () -eleven (f- where | Г and СР - respectively module and the phase of the reflection coefficient, A is the wavelength in the penalty line, fix the position of the moving redacci moreover, the plus sign is taken if the probe zero corresponding to the zero value of the phase shift is shifted to the phase shift source, determines the transmission line excitation generator, and the offset value D1 of the position minus - if to the studied dual-probe, corresponding to the terminal. the zero value of the phase shift relative to the reference plane in the short circuit mode, calculate the modulus and phase of the reflection coefficient by the formulas ten I f - rg () l H-tga () -eleven (f- where | G and CP - respectively module and phase of the reflection coefficient, A - wavelength in the ne line