Dielectric characterization of materials at microwave frequency range

Materials Research

J. De Los Santos¹  D. Garcia¹  J.a. Eiras¹ 

[1] ,Universidade Federal de São Carlos Departamento de Física Grupo de Cerâmicas FerroelétricasSão Carlos SP ,Brazil

关键词: Dielectric characterization;    microwave dispersion;    ferroelectric ceramics;   

DOI  :  10.1590/S1516-14392003000100017

来源: SciELO

【 摘 要 】

In this study a coaxial line was used to connect a microwave-frequency Network Analyzer and a base moving sample holder for dielectric characterization of ferroelectric materials in the microwave range. The main innovation of the technique is the introduction of a special sample holder that eliminates the air gap effect by pressing sample using a fine pressure system control. The device was preliminary tested with alumina (Al2O3) ceramics and validated up to 2 GHz. Dielectric measurements of lanthanum and manganese modified lead titanate (PLTM) ceramics were carried out in order to evaluate the technique for a high permittivity material in the microwave range. Results showed that such method is very useful for materials with high dielectric permittivities, which is generally a limiting factor of other techniques in the frequency range from 50 MHz to 2 GHz.

【 授权许可】

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