Study on Error Reduction for Dynamic Measurement of Complex Permittivity Using Electromagnetic Field Simulator

Takayuki NAKAMURA  Yoshio NIKAWA  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.2   pp.206-212
Publication Date: 2003/02/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Measurement
perturbation method,  transmission line modeling method,  cavity resonator,  temperature dependent complex permittivity,  microwave heating,  

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To measure temperature dependent complex permittivity of dielectric materials, a rectangular cavity resonator with a heating system has been developed. In the experiment, microwave power with the frequency of 2.45 GHz is applied to heat the dielectric material. In order to reduce the error of the complex permittivity of dielectric material obtained from the perturbation method, an electromagnetic (EM) field simulator is applied which uses the Transmission Line Modeling (TLM) method. The uniformity of the temperature is also discussed by the use of heat transfer equation which applies the results of TLM simulation. It is found from the results that the accurate temperature dependence of complex permittivity of the material can be obtained by the method presented here.