Summary

International Symposium on Antennas and Propagation

2010

Session Number:2WC1

Session:

Number:2WC1-17

An Adaptive Evaluation Method of Material with Complex Permittivity in a Cylindrical Cavity

N. Nakao,  Y. Morishita,  K. Wakino,  T. Kitazawa,  

pp.-

Publication Date:2010/11/23

Online ISSN:2188-5079

DOI:10.34385/proc.52.2WC1-17

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Summary:
A cylindrical cavity resonator has been widely utilized to evaluate the complex permittivity of dielectric materials [1]-[4]. The most popularly used cavity modes for evaluation are the TE011 and TM010 modes. The TM010 mode has been chosen for the rod-like samples while the TE011 mode has been applied for the circular bulk or thin disk samples. The TE011 mode has a higher Q than other cavity modes, but it is not the dominant cavity mode [5]. When high permittivity and/or lossy samples are loaded in the cavity, the resonant frequency becomes lowered significantly and TE01δ resonant mode for the loaded sample may be confused with other resonant modes. This paper proposes an adaptive evaluation method of material with complex permittivity by using TE01δ mode of a cylindrical cavity resonator. In the proposed method, the sample with various sizes and materials can be loaded at arbitrary height in the resonator. Therefore, the change in the resonant frequency can be kept in some limited variation. So that the TE01δ resonant mode can stay in the uncrowded frequency region. The electromagnetic method used for the material evaluation is based on a hybrid EM method proposed by the authors [6].