Improvement of Unloaded Q of Dielectric Image Resonator

Kazuki IWASHITA  Ikuo AWAI  Hiroshi KUBO  Atsushi SANADA  

IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.1   pp.34-39
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.1.34
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics)
dielectric image resonator,  electromagnetic field distribution,  resonant frequency,  unloaded Q,  

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Unloaded Q of a dielectric image resonator is discussed based on the electromagnetic field distribution. It is shown that a partial air gap and a dielectric sheet with low permittivity between the dielectric resonator and the shield case reduce both the dielectric loss and the conductor loss. Especially, reduction of the conductor loss is significant, since the magnetic field distribution moves from the conductor to the upper part of resonator. A half-cut image resonator with an air gap and dielectric spacer is simulated and measured. The unloaded Q of the dielectric resonator with low dielectric loss is improved by about two times from that of original image resonator.