Method for calculating equivalent dielectric constant of tetrapod-shaped zinc oxide whisker composite material

Abstract

The invention discloses a method for calculating an equivalent dielectric constant of a tetrapod-shaped zinc oxide whisker composite material. The method is implemented according to the following steps of: 1, deducing a transmission coefficient of the tetrapod-shaped zinc oxide whisker composite material; 2, considering two transmission coefficient expressions to obtain a transcendental equation; 3, solving the transcendental equation to obtain a parameter <epsilon>eff. According to the method for calculating the equivalent dielectric constant of the tetrapod-shaped zinc oxide whisker composite material, the equivalent dielectric constant of the tetrapod-shaped zinc oxide whisker composite material can be calculated more simple and rapid under the condition that no transcendental experimental knowledges are used as basis.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic fields and microwaves, and relates to a method for calculating the equivalent dielectric constant of a four-acicular zinc oxide whisker composite material. Background technique [0002] In recent years, research on nanostructured composite materials has become one of the hotspots in nanomaterials research. Among many different kinds of nanostructured materials and additives, tetrapod-shaped ZnO whiskers have been obtained due to their remarkable characteristics such as high strength, high elastic modulus, isotropic properties, microwave and ultraviolet absorption capabilities, etc. It has attracted extensive attention of researchers from all over the world. Many experimental studies on the microwave absorption properties of tetrapod ZnO whisker composites have been carried out, and a large number of research papers have been published. However, compared to the rapid progress of experimen...

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Problems solved by technology

However, it should be pointed out that these two theoretical methods have a common shortcoming, that is, prior knowledge is required in the calculation process.

Specifically, on the one hand, the actual measured equivalent electromagnetic parameters of the four-needle ZnO whisker composite material are needed in the final expression of the theoretical attenuation model, but from the perspective of theoretical calculation, the equivalent electromagnetic parameters themselves are The unknown and the quantities that need to be solved, if the equivalent electromagnetic parameters are measured, can be directly used to calculate the absorbing characteristics; on the other hand, the equivalent spherical particles and strong disturbance theory are used to calculate the four-acicular ZnO whisker composite material The method of equivalent electromagnetic parameters needs to use the Taylor expansion with undetermined coefficients, but there is no theoretical method to determine these undetermined coefficients at present, and it needs to be obtained by fitting the reflectivity data measured by existing experiments, that is, It is said that prior experimental knowledge is required as the basis for fitting

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