SU1317368A1 - Panoramic meter of complex reflectance - Google Patents

Abstract

The invention relates to a technique for measuring at microwave frequencies and provides an increase in measurement accuracy and an increase in speed. The probing signal from the oscillating frequency generator 1 passes through a directional coupler (but) 2 incident wave, an omnidirectional coupler 3 and BUT 4 of the reflected wave to the device under study (RI) 12. The signal reflected from the NU 12 input passes through the NO 4 to the non-directional a coupler 3, in which the probes 8 are located. The powers of the signals branched by the HO 2, 4 and the powers of the signals at the outputs of the probes 8 are measured respectively. channels of multi-channel power meter 5. Complex coefficient The reflection is determined after preliminary calibration. For calibration, instead of PS 12, a first load is connected with a known complex coefficient. reflection and using the block 6 input-output information, the interface unit (BS) 11, the calculator 7 and the EU 10 sets the frequency of the generator 1 sequentially from the beginning (O co oo 05 00

Description

to the final measurement frequency. The power values measured by meter 5, through BS 9, are transferred to calculator 7, where they are stored. A second load is then established.

one

This invention relates to a microwave measurement technique.

The purpose of the invention is to improve the measurement accuracy and increase speed.

The drawing shows a structural diagram of a panoramic meter of complex reflection coefficients.

Panoramic complex reflection coefficient meter contains oscillating frequency generator 1, directional coupler 2 incident wave, non-directional coupler 3, directional coupler 4 reflected wave, multichannel power meter 5, information input-output unit 6, calculator-7, probes 8, block 9 matching calculator 7 with meter 5, block 10 of calculator 7 with generator 1, block 11 of calculator 7 with block 6, and the device under study 12.

The panoramic complex reflection coefficient meter operates in a lateral fashion.

The sounding signal from the generator 1 output goes through the main path of the directional coupler 2, the non-directional coupler 3, the main path of the directional coupler 4 to the input of the device under study 12 The signal reflected from the input of the device 12 is fed through the main path of the directional coupler 4 to the non-directional coupler 3. The signal powers, the coupled directional couplers 2 and 4, and the signal powers at the outputs of the probes 8 are measured by the corresponding channel and the meter 5.

The process of determining the complex reflection coefficient consists of a calibration procedure and a measurement procedure. The calibration procedure is based on the known value of the complex coefficient. reflection and repeat measurement. Calculator 7 determines the calibration coefficients, the values of which are used in the measurement mode. 1 il.

five

0

five

0

It proceeds in time to the measurement procedure.

The calibration procedure is as follows. As the device 12 under investigation, a first load is connected to the output of the main channel of the directional coupler 4 with a known complex reflection coefficient. From block 6, through the interface 11 to the calculator 7, a signal is transmitted that converts the calculator 7 to the calibration mode. G block 6 on the calculator 7 through the block 11 of the conjugation information is entered on the initial and final measurement frequencies. The calculator 7, via the interface 10, provides a control signal to generator 1, which sets the initial frequency. After setting the frequency, the calculator 7, via the interface 8, conjugates the control signals to the meter 5, which, having received these signals, measures the power at all its inputs and the measured values, via the interface 9, sends to the calculator 7, in which the measured values are stored power values. After memorization, the calculator 7 through the interface 10 acquires a control signal to generator 1, which sets a frequency value equal to

P

fH + n (k - fH) / N,

35

n

fK

N

n 40

45

where c is the initial frequency; end frequency; the number of measured frequency marks;

index taking values 1,2,3 ,, .., N,

and, in the manner described, the power values are measured and stored. Further, the index n is increased by one and the next frequency value is set. The process continues until the measurement and memorization of power. .one

at the final frequency of measurement, after which the calculator 7 through the conjugate block 11 supplies the signal to the input information block 6 of the information about the need to set a different value of the complex reflection coefficient of the load. A second load is connected to the output of the main channel of the directional coupler 4 instead of the first load , with a known value of the complex reflection coefficient and the above described measurement and memorization of power values at frequencies, where n takes values from O to N inclusive. Next, the calculator 7 solves the system of equations from which the calibration coefficients are determined and the solutions are stored. This completes the calibration procedure.

one

The measurement procedure is carried out as follows. The device 12 is connected to the output of the main channel of the directional coupler 4. From block 6, through block 11 of the computer 7, a signal is transmitted that converts the computer 7 to the measurement mode. The calculator 7, via the coupler 10, generates a signal 1 that sets the initial frequency. After setting the frequency, the calculator 7 through the conjugation block 9 outputs the signal to the gauge 5, having received, the gauge 5 measures the power entering the inputs, and outputs their values through the conjugate block 9 to the calculator 7. The calculator 7 determines the module and the phase of the reflection coefficient, using the values of the calibration coefficients (coefficients found in the calibration mode. Calculator. 7 is issued by A. Revin

Compiled by V.Goncharov

Tehred M. Khodanich Proofreader A.Obruchar

Order 2418/40 Draw 730 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

84

sheni | r1 and arg 1, as well as the value of the frequency at which the solution is found. Through the interface unit 11 to the information input / output unit 6. Next, the next value of the frequency is set to f (f - f) / N, where n 1, and the measurement procedure is repeated. The process continues until solutions are found.

1G and arg. G at the end frequency.

Claims (1)

Invention Formula Panoramic complex reflectance coefficient meter, containing a oscillating frequency generator, the output of which is connected to the input of the main path of the directional output wave coupler, a directional reflected reflection coupler, a non-directional coupler in which the probes are located, a multi-channel power meter, whose inputs are connected respectively to the outputs of the secondary paths directional couplers and probes, calculator, connected through appropriate interface blocks with a sweeping frequency generator, multistage. With a power meter and an information input-output unit, characterized in that, in order to increase measurement accuracy and increase speed, the main path output of the directional feed wave coupler is connected to the non-directional coupler input, the main path of the directional reflector coupler output is connected to the output of the non-directional coupler, and its output is the output of the panoramic complex reflection coefficient meter.