Design of Four-Stage Millimeter Wave BPF Using the Whispering-Gallery Mode Dielectric Disk Resonator

Yosuke SATO  Yoshinori KOGAMI  Kazuo SHIRAISHI  Yoshiro TOMABECHI  Kazuhito MATSUMURA  

IEICE TRANSACTIONS on Electronics   Vol.E86-C    No.8    pp.1621-1628
Publication Date: 2003/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
millimeter wave filter,  Whispering-Gallery mode,  dielectric disk resonator,  

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The millimeter wave bandpass filter using the Whispering-Gallery mode (WG mode) dielectric disk resonators is presented in this paper. A 4 stage maximally flat bandpass filter is constructed with the PTFE disk resonators. For the filter design, the coupling coefficients of this mode in the coupled disk resonators are calculated by an approximated separation of variables method. Furthermore, the external Q values of the disk resonator excited by a dielectric waveguide are investigated experimentally. Designed center frequency is 60 GHz and 3 dB band width is 150 MHz. Furthermore, as an attempt to improve the spurious characteristics, another filter structure which consists of some kinds of dielectric disk is tested. As a result, some spurious responses are reduced considerably.