Sample table for inhibiting quasi-optical cavity degeneration higher-order mode, testing method and application thereof

Abstract

The invention provides a sample table for inhibiting a quasi-optical cavity degeneration higher-order mode and a testing method and application thereof. The sample table comprises a dielectric substrate, the center of the dielectric substrate is provided with a circular metal coating layer, and a microwave matching circuit structure is engraved on the metal coating layer. The microwave matching circuit structure comprises two gaps which are symmetrically arranged at two sides of the center of a circle of a circular metal coating layer and are parallel to a TEM00q mode electric field direction.The thickness of the metal coating layer is greater than the skin depth of working frequency point electromagnetic waves; the loss tangent value of the dielectric substrate material is higher than 1e-4. According to the invention, on the premise that the TEM00p mode is not affected, the non-TEM00p mode near the TEM00p mode is not matched, so that the resonance phenomenon cannot be excited; and thus the energy can be consumed through the high-loss substrate, so that double peaks appearing in the TEM00p mode corresponding to the frequency spectrum can be improved into symmetrical single peaks;when the quasi-optical cavity method is used for testing a complex dielectric constant, the test of the Q value corresponding to the TEM00p mode is more real, so that the precision of testing the lossof the material to be tested through the quasi-optical cavity method is improved.

Description

technical field [0001] The invention belongs to the field of microwave technology, in particular to a TEM used in a quasi-optical cavity 00p The sample platform, test method and application of mode measurement complex dielectric constant. Background technique [0002] TEM 00p The quasi-optical cavity of the mode is a microwave resonator, which can be used for broadband complex permittivity measurement of dielectric materials. This technology has the characteristics of fast, broadband, accurate and reliable, and has certain practicability. Its working mode is TEM00p mode, which has the advantages of simple field structure, stability, no dispersion, wide operating frequency and so on. A common quasi-optical cavity test system consists of a reflective surface and a sample stage. There are single or two coupling holes on the reflective surface, which are used for single-port test or dual-port test respectively. By inserting a coupling ring into the coupling hole to align The ...

AI Technical Summary

Problems solved by technology

In the case of high frequency, there is a non-TEM00p mode that is very close to the frequency of the TEM00p mode, which will lead to the inability to accurately measure the Q value in the TEM00p mode, which seriously affects the loss test accuracy of the sample to be tested.

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