Method for testing complex dielectric constant of microwave dielectric material

Abstract

The invention relates to a method for testing the complex dielectric constant of microwave dielectric material and belongs to the field of microwave testing technology. The method comprises the following steps: firstly, processing the microwave dielectric material to be measured into a rectangular thin slice with two parallel surfaces and simultaneously preparing two dielectric material supporting blocks and two metal conduction strips, then forming a double-sided parallel strip line resonator, inputting a microwave frequency sweep test signal into the double-sided parallel strip line resonator through a coaxial coupling probe, measuring the resonant frequency fr and the loaded quality factors QL after the microwave frequency sweep test signal passes through the double-sided parallel strip line resonator and combing the known parameters (Relevant dimension, complex dielectric constants of the dielectric material supporting blocks and the like) to calculate the complex dielectric constant of the microwave dielectric material to the measured. The method has the advantages of wide working frequency band, small volume of a test device, good mixed mode rejection, small test error and the like and is convenient to use. The invention can realize the wide-scope, accurate and quick noninvasive measurement to the complex dielectric constant of the microwave dielectric material within the scope of each microwave frequency band.

Description

technical field [0001] The invention belongs to the technical field of microwave testing, and relates to a method for testing the complex dielectric constant of microwave dielectric materials, in particular to a method for testing the complex dielectric constant of microwave dielectric materials based on double-sided parallel stripline resonators. Background technique [0002] Microwave low-loss dielectric material is an indispensable multifunctional material in radar communication, microwave circuit, microwave antenna, radome and various microwave components, and its complex dielectric constant must be known when it is designed and used. The complex permittivity is the main basis for evaluating the performance of microwave dielectric materials, and it is also an important parameter for studying the electrical properties of materials. Therefore, it is of great significance to quickly and accurately test the complex permittivity of materials in a wide frequency range. [0003...

AI Technical Summary

Problems solved by technology

Commonly used resonant cavities include rectangular cavities and cylindrical cavities, etc., but when testing in the microwave low frequency band, the test cavity is too large, resulting in large cavity and sample processing, heavy weight, and difficult to operate. narrow frequency range

For the stripline resonator method GB / T12636-90, which is mainly used to test low-loss microwave dielectric materials in the low-frequency band, two pieces of dielectric materials need to be manually made into a stripline resonator during the test, and the assembly process is cumbersome. The processing consistency of block dielectric materials is high, and the inner conductor of the strip line needs to be made every time. Errors in the assembly process or irregular cutting of the inner conductor will lead to deviations in test results

Also, due to the influence of the high-order mode of the stripline resonator, its test frequency range will be limited.

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