Miniaturized Stepped Impedance Resonators with a Double Coaxial Structure and Their Application to Bandpass Filters

Morikazu SAGAWA
Michiaki MATSUO
Mitsuo MAKIMOTO
Kazuhiro EGUCHI

Publication
IEICE TRANSACTIONS on Electronics   Vol.E78-C    No.8    pp.1051-1057
Publication Date: 1995/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
dielectric coaxial resonators,  stepped impedance resonators,  bandpass filters,  

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Summary: 
This paper describes newly developed miniaturized stepped impedance resonators with a double coaxial structure (DC-SIR's) and their application to bandpass filters. The new DC-SIR's using dielectric material are devised for more compact and lower frequency bandpass filters. Fundamental characteristics such as resonance properties and unloaded-Q make it clear that DC-SIR's have attractive features that miniaturization can be achieved without Q-factor degradation. Trial 400 MHz bandpass filters incorporating DC-SIR's are also made. Experimental results of bandpass filters proved that DC-SIR's are applicable to lower frequency band radio equipment and able to contribute to the expansion of applicable frequency ranges of dielectric coaxial resonators.