Precise Measurement of Microwave Permittivity Based on the Electromagnetic Fields in a Cavity Resonator with Finite Conductivity Walls

Hiroyuki TANAKA  Akihiro TSUTSUMI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.12   pp.2387-2393
Publication Date: 2003/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Trends on Microwave and Millimeter Wave Application Technology)
Category: Measurement
Keyword: 
microwave,  millimeter wave,  permittivity,  cavity resonator,  conductor loss,  electromagnetic field,  

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Summary: 
In this paper, we calculated resonant frequency and unloaded Q-factor for the TM0i0 resonant mode excited in a cylindrical cavity composed of walls with finite conductivity and with a dielectric rod loaded coaxially along the central axis. Formulation for the calculation is made using the mode-matching method. Convergence of the calculation is checked. Values calculated by the present method for various combinations of dimensions, permittivity, and conductivity of the inner-components of cavity are compared with those calculated by a conventional method formulated using loss-less electromagnetic fields of cavity. Although the difference between the values calculated by those two methods is usually small, it is found that the difference increases as permittivity of dielectric rod increases and becomes about 10-6 in reciprocal of unloaded Q-factor of the loaded cavity in a presented case.