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Tunable Resonator Employing Comb-shaped Transmission Line and Semiconductor Switches Kunihiro KAWAI Daisuke KOIZUMI Hiroshi OKAZAKI Shoichi NARAHASHI Publication IEICE TRANSACTIONS on Electronics Vol.E97-C No.8 pp.795-802 Publication Date: 2014/08/01 Online ISSN: 1745-1353 DOI: 10.1587/transele.E97.C.795 Type of Manuscript: PAPER Category: Microwaves, Millimeter-Waves Keyword: Tunable resonators, microstrip lines, switches, Full Text: PDF>>
Summary: This paper presents a simple-structured tunable resonator employing semiconductor switches that can change its resonant frequency discretely but precisely. The tunable resonator comprises a transmission line with a comb-shaped pattern and multiple single-pole single-throw (SPST) switches placed between the teeth of the comb-shaped pattern. The resonator changes its resonant frequency according to the switch states, by controlling the path length carrying a high frequency current. The characteristics of the proposed resonator are evaluated through both method of moment electromagnetic simulation and fabrication, using GaAs FET SPST switches. The fabricated resonator changes its resonant frequency from 1.63 GHz to 1.85 GHz. This paper also introduces two circuit designs based on the proposed resonator that expands the tuning range of the resonant frequency or the number of resonant frequencies to be obtained. | |||||
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