Clamp rod attenuation distribution test fixture, test system and test method

Abstract

The invention provides a clamping rod attenuation distribution test fixture, test system and method, the test fixture is divided into: microstrip line part, gradient line part and parallel double line part, microstrip line part, parallel double line part and gradient line Some parts are distributed symmetrically on the left and right sides of the sample hole. The sample hole is a central hole or a side hole. The central hole and the side hole run through the entire test fixture from the direction perpendicular to the test fixture substrate. The gradient line part in the test fixture realizes from The impedance gradient from the microstrip line part to the parallel double line part; the present invention uses the test fixture from the parallel double line line to the microstrip line, which can more realistically simulate the electromagnetic field environment of the clamping rod in the traveling wave tube, and the test reliability and accuracy Higher reliability; by reducing the thickness of the dielectric substrate while ensuring the 50 ohm characteristic impedance of the microstrip line, a higher longitudinal test resolution can be achieved; combined with a horizontal moving device and a program-controlled computer, the clamping rod can be quickly tested online, and the operation Simple.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic parameter testing of microwave and millimeter wave materials, and in particular relates to a fixture, a testing system and a testing method for attenuation distribution testing of product shape, square and circular clamping rods. Background technique [0002] In order to suppress the self-excited oscillation in the traveling wave tube, a centralized attenuator is usually set at an appropriate position in the traveling wave tube. The concentrated attenuator can absorb the electromagnetic signal on the slow wave line within a short distance, which can eliminate the reflected signal, thereby suppressing self-oscillation. But the centralized attenuator also has the problem of matching. If the matching is not good, it will cause reflection and then lead to self-excited oscillation, and the matching of the centralized attenuator depends on the attenuation distribution law of the attenuating coat...

AI Technical Summary

Problems solved by technology

Traditional test fixtures and methods include rectangular waveguides (or cavities), tapered waveguides, coaxial cavities, ridge waveguides (or cavities) and microstrip line fixtures, as well as the corresponding transmission reflection method and surround method. These test methods currently used, Its longitudinal detection resolution is low (such as rectangular waveguide, coaxial cavity, etc.), and it cannot accurately simulate the electromagnetic field environment of the clamping rod in the traveling wave tube, which limits the authenticity and accuracy of the test results

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