Sample table for inhibiting quasi-optical cavity degeneration higher-order mode, testing method and application thereof
A sample stage and high-order mode technology, applied in the microwave field, can solve problems such as loss of test accuracy, affecting the sample to be tested, and inability to accurately measure the Q value, and achieve the effect of improving accuracy
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[0040] A sample stage for suppressing the degenerate high-order mode of a quasi-optical cavity, comprising a dielectric substrate 4, the center of the dielectric substrate 4 is provided with a circular metal coating 3, and a microwave matching circuit structure is engraved on the metal coating 3 1. The microwave matching circuit structure 1 is a circular metal coating layer 3 symmetrically arranged on both sides of the center of the two gaps parallel to the electric field direction of the TEM00q mode, the dielectric substrate is provided with a circular fixing hole 2 for passing through Fasteners fix the sample stage on the quasi-optical cavity, the thickness of the metal coating 3 is greater than the skin depth of the electromagnetic wave at the operating frequency, and the loss tangent of the dielectric substrate 4 material is higher than 1e-4.
[0041] In this embodiment, the dielectric substrate 4 is an FR-4 rigid dielectric substrate with a thickness greater than 2 mm.
[0042...
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