SU754328A1 - Device for measuring parameters of microwave elements - Google Patents

Description

The invention relates to the technique of "pa-measurements".

A device for measuring the parameters of super-high-frequency elements is known, which contains an ultra-high-frequency generator, to the output of which is connected a super high-frequency path with a measuring probe connected via a detector to the recorder, as well as a controlled phase shifter.

However, the known device does not provide automatic measurement of time-varying parameters.

The purpose of the invention is to automate measurements while ensuring the possibility of measuring time-varying parameters.

For this purpose, in the device for measuring the parameters of microwave elements containing a microwave generator, to the output of which a microwave channel is connected with a measuring probe connected through a detector to the recorder, as well as a control

2

Led-phase shifter, between the input of the controlled phase-shifter and the output of the superhigh-frequency path, as well as between the output of the controlled phase-shifter and the microwave frequency under study—

By the ^5th element, two directional couplers are introduced, the output arms of the secondary channels of which are interconnected by an additionally introduced segment of the superhigh-frequency path connected by

ten ..

cuts ν coupling elements with N add. but entered by detectors connected via H inputted pulse formers to an inputted OR element, the output of which is connected to the additionally introduced control unit, while the outputs of the additionally introduced control unit are connected respectively to the recorder input and the control

2D Input controlled phase shifter.

The drawing shows the structural

device schema.

A device for measuring the parameters of microwave elements contains

7 54328

There is a microwave generator 1, whose output is connected to microwave 2 with measuring probe 3 connected through detector 4 to recorder 5, as well as controlled phase shifter 6 and two directional couplers 7 and 8 connected between the input of controlled phase shifter 6 and output of microwave 2, respectively and between the output of the controlled phase shifter 6 and the microwave frequency element 9 under investigation, the output arms of the secondary channels of the directional couplers 7, 8 are interconnected by a segment 10 ohm microwave tract associated coupling elements through N

11-1, 11-2,. . . , And -Ν with M detectors 12-1, 12-2,. . . , 12 - M, connected via M drivers 13-1, 13-2 ..... 13-Ν pulses to the element OR 14, the output of which is connected to the control unit 15, the 'outputs of which are connected respectively to the synchronization input of the recorder 5 and the manager input controlled Phaser 6.

The device works as follows.

zom.

High-frequency oscillations from the super- high-frequency generator 1 through the superhigh-frequency path 2 fall into the directional coupler 7, where part of the incident power is branched off into its secondary channel; then pass through the controlled phase shifter 6, changing its phase by the amount determined by the voltage supplied from the control unit 15 to the control input of the controlled phase shifter 6, pass through the directional coupler 8, where a part of the incident power is also branched off into its secondary channel, reflected from the microwave superimposed _{The 45th} element 9 and again fall into the superhigh-frequency path 2, once again changing its phase when passing through the controlled phase shifter 6.

Thus, in the microwave path 2, as a result of the interference of the incident and reflected waves, a standing wave occurs, and at the connection point of the measuring probe 3 the phase of the reflected wave is shifted relative to the phase of the incident by the value of H-2dH'-N ^/ where H - F ^{aza of} the reflection coefficient investigated superhigh-frequency element 9; Dh * - shift

phase introduced by controlled phase shifter 6; ψ is the phase shift corresponding to the distance from the measuring probe 3 to the superhigh ₅ under study of the total element 9 and back.

In this case, the signal at the output

the detector 4 connected to the measuring probe 3, is determined by the expression

p + G + 27-00 ^ (^ - ΊΔΜ’-ψ)!

10 where V is the voltage of the incident wave, '

G - module of the reflection coefficient of the investigated microwave element 9 ..

In order to find the values of r

15 and 4 ', while excluding the unknown value V _}, it is necessary to have a system of at least three equations. In the device, this is achieved by registering voltages from the output of the detector 4 of the measuring probe 3 at those points in time when the phase change introduced by the controlled phase shifter 6 is a multiple of ΙϋΙα / AB, where is the distance between elements 11-1, 11-2,. . ₄ , 11 — N

25 connection, And - the wavelength in the segment 10 of the superhigh-frequency path. Then, if at some points in time, ΐ _g> . . . , ΐ ν magnitude of the phase shift introduced by the controlled phase shifter

³⁰ 6, respectively, is equal to d i? l v

xn vi 7 \ and 4, -2, ... Ν, then _1n = Y * [ig +

ν 2Гсоа (h> - 4 (/ V

40

35 where υ _ίη is the voltage value at the output of the detector 4 at the moment of time £. Solving the system of equations for 1 _p , it is possible to determine the values of G and C. With §, it is assumed that over time) the phase C> of the reflection coefficient remains constant, which imposes a restriction on the maximum frequency

phase changes ψ

ί "_ £.

ΐί

50

55

"

The required number of measurements, and therefore the communication elements 11-1,

11-2, . . , 11-Н is determined by the number of unknowns in the expression for and.

The formation of control pulses of the recorder 5 is carried out by the control unit 15 by signals received at its input from the communication elements 11-1, 11-2,. . . , 11 -M at the moments of passage of sections, in which these elements of connection 11-1, 11-2,. . . , 11 -Ν installed, with a minimum of a standing wave, on -

754328

6

superfluid-path tractable in the interval 10 as a result of interference of the branched parts of the incident power of the signals from the super-high frequency generator 1 before and after the control

my phase shifter 6. At moments £. ,

ί? *

. , Φ _η passing through this minimum of the corresponding coupling element 11-1, 11-2 ..... 11-Ν, the corresponding driver 13-1, 13-2, .... 10 13 — N produces a signal that through the element OR 14 is fed to the input of the control unit 15. This control unit 15 issues a command to the recorder 5 to memorize the voltage and 1η> post. '5 farther from detector 4 output to recorder input 5.

If the voltage supplied from the control unit 15 to the control input of the controlled phase shifter 6 is 20, the phase shift introduced by the controlled phase shifter 6, ^ continuously varies with the period, then the minimum of the standing wave in the 10 superhigh-frequency path is also continuous — ²⁵ but also the same period moves, passing successively all sections in which the elements of connection 11-1, 11-2, ..., 11-установлены are installed.

Therefore, if the distance between the 30 elements of communication 11-1, 11-2,. . . ,

11-N is equal to ά, then the signals from their outputs arrive at the input of the control unit 15 at those times £

. . . , c, when the phase shift introduced by the controlled phase shifter 6 is equal, respectively, A

Communication item 11-1.4 CHA.

11-2 _, and finally

1). For item ⁴⁰

communications 11 — Ы. Since privat at each time moment 1 ^, T _g ,. . ·,

£ _Ν to the recorder 5 is issued a control pulse, then the corresponding voltage of these moments II "· · ·"

from the output of the detector 4 are fixed.

- Oh ^ for evil—

D.ZS

"" G.

for

The values of these voltages determine the values of G and ψ.

The device provides automatic measurement of time-varying parameters.

Claims (1)

Claim Device for measuring parameters of microwave elements containing a microwave generator, the output of which is connected to the microwave path with a measuring probe connected through a detector to the recorder, as well as a controlled phase shifter, in order to automate measurements while ensuring the measurement of time-varying parameters , between the input of the controlled phase shifter and the output of the microwave path, as well as between the output of the controlled phase shifter and research The ultra high-frequency element introduced two directional couplers, the output arms of the secondary channels of which are interconnected by an additionally introduced segment of the ultra high frequency path connected through N coupling elements to N further inserted detectors connected via N input pulse drivers to the input OR element, the output of which is connected to additionally introduced by the control unit, while the outputs of the additionally introduced control unit are connected respectively to the input of the register torus and control input controlled phase shifter.