Control of Spurious Property of a Dielectric Resonator by Its Division

Kazuki IWASHITA  Ikuo AWAI  Hiroshi KUBO  Atsushi SANADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.8   pp.1759-1764
Publication Date: 2003/08/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
dielectric resonator,  division,  spurious property,  anisotropy,  

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Summary: 
Segmentation of a dielectric resonator enables one to control its spurious property. When a dielectric plate is divided into some planar pieces, the effective permittivity does not change appreciably along the divided plane, while it decreases quite an amount perpendicular to it. This anisotropy is useful for shifting the resonant frequencies of unwanted modes of a dielectric resonator. Since its eigen modes have their own electric field distribution, segmentation of a resonator along the electric line of force of a certain mode will not affect its resonant frequency. When the type of segmentation is changed, we can select the wanted mode, and thus control the resonant frequencies of the unwanted modes. Calculated results with an EM field simulator and experimental results of controlling the resonant frequency are shown for divided dielectric resonators.