SU1239642A1 - Method of determining types of wave excited in regular waveguide by arbitrary inhomogeneity - Google Patents

Abstract

This invention relates to a microwave measurement technique. The purpose of the invention is to increase precision by eliminating the disturbance of the field structure in the regulatory waveguide. A device that implements this method contains a regular waveguide (PB) 1, a test body in the form of an input made in the form of a set of dielectric plates (DP) 2 installed with the possibility of changing the distance between them, and the non-uniformity in the form of a pin 3. When This DP 2 is perpendicular to the longitudinal axis of PB 1, and the dimensions of PD 2 are equal to the cross section sizes of PB 1. The goal is achieved by measuring the amplitude-frequency 1x characteristics of PB 1, at different distances between DP 2 and - resonant often there. 1 il. (ABOUT

Description

one

: 2396A

The invention relates to a technique for measuring at microwave frequencies and can be used to determine the types of out-of-limit waves excited by arbitrary heterogeneity in regular waveguides, monitoring parameters at the microwave frequencies of various elements of the waveguide path.

The aim of the invention is to increase the accuracy by eliminating the disturbed PIA field structure in a regular waveguide. ,

The drawing shows the structure of a device that implements the proposed method for determining the types of waves excited in a regular waveguide in an arbitrary inhomogeneity.

The device contains a regular waveguide 1, a test body in the form of an insert made in the form of a set of dielectric plates. 2, installed with the possibility of measuring the distance between them; discontinuity in the form of a pin 3.

 The method of determining the types of waves excited in. a regular waveguide with an arbitrary inhomogeneity, is implemented as follows.

The insert is introduced into a regular waveguide 1 (rectangular), with a non-uniformity with pin 3, its axes of the regular waveguide 1 are shifted to pin 3 and the amplitude-frequency characteristic is observed. 1ACCH), for example, using an automatic P2 attenuation meter.

At sufficiently long distances between pin 3 and the input (on the order of two transverse dimensions of a regular waveguide 1), the frequency response of such a system is a monotonic curve. With a certain distance between pin 3 and the contribution of the damped, transient types of waves excited by pin 3, will be sufficient to excite the resonances of the liner. At the same time, on the frequency response in narrow frequency ranges (for example, and ii in ts are resonant deviations of the attenuation values from the average level,

The central frequencies t and Tr of this decay attenuation (resonant

 2

curves) correspond to the resonances of the natural oscillations of higher types of waves in the contribution. By measuring these frequencies by calculation or using the spectrum graph, the types of oscillations contributed, the analyzed types of impeller waves, excited by pin 3, are determined.

Pin 3, located symmetrically with respect to the middle of the wide walls of a regular, waveguide 1, causes the excitation of only odd, transmixed types of waves. At this frequency response, resonance attenuation measurements corresponding to even types of oscillations and electric input, for example, at a frequency f / j, are absent. A slight mismatch; en: not pin 3 from the symmetric position will lead to the excitation of even types of waves. Then on the frequency response of Wits resonance change in attenuation at a frequency -. This allows controlling the electrical and geometric symmetry of the position of sp 3 in a regular waveguide 1 by the form of the frequency response.

Claims (1)

Invention Formula The method of determining the types of waves, the excitation of waves in a regular volity-e arbitrary inhomogeneity, including the supply of a working frequency signal to a regular waveguide, the introduction of a test body into a regular waveguide and its movement so that, in order to increase accuracy by eliminating the disruption of the field structure in a regular waveguide, an insert made as a set of dielectric plates, perpendicular to the longitudinal axis of the regular waveguide and installed with OPPORTUNITY and Menenius distance therebetween, wherein the dimensions of the dielectric plate are equal size po- re-screw molecular weight regulator sectional waveguide measured amplitude-frequency characteristics of the molecular weight regulator waveguide at various distances between the dielectric plates and at their resonant frequencies determined types of waves ..