Application of the body of revolution finite-element method in a re-entrant cavity for fast and accurate dielectric parameter measurements  

作　　者：冯天琦 余承勇 李恩 石玉 Tianqi Feng;Chengyong Yu;En Li;Yu Shi(School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China

出　　处：《Chinese Physics B》2023年第3期36-44,共9页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.62001083);the Guangdong Provincial Key Research and Development Project,China(Grant No.2020B010179002).

摘　　要：In dielectrometry,traditional analytical and numerical algorithms are difficultly employed in complex resonant cavities.For a special kind of structure(a rotating resonant cavity),the body of revolution finite-element method(BOR-FEM)is employed to calculate the resonant parameters and dielectric parameters.In this paper,several typical resonant structures are selected for analysis and verification.Compared with the resonance parameter values in the literature and the simulation results of commercial software,the error of the BOR-FEM calculation is less than 0.9%and a single solution time is less than 1 s.Reentrant coaxial resonant cavities loaded with dielectric materials are analyzed using this method and compared with simulation results,showing good agreement.Finally,in this paper,the established BOR-FEM method is successfully applied with a machined cavity for the accurate measurement of the complex dielectric constant of dielectric materials.The test specimens were machined from polytetrafluoroethylene,fused silica and Al_(2)O_(3),and the test results showed good agreement with the literature reference values.

关 键 词：MICROWAVE resonance method dielectric measurement coaxial resonant cavity 

分 类 号：TB34[一般工业技术—材料科学与工程]