Resonant Frequency and Bandwidth Tunable Ring Resonator Using GaAs FET SPST Switches

Kunihiro KAWAI  Hiroshi OKAZAKI  Shoichi NARAHASHI  Noriharu SUEMATSU  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.5   pp.388-398
Publication Date: 2019/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018ECP5063
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
tunable resonators,  ring resonators,  microstrip lines,  switches,  

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Summary: 
This paper presents a theoretical analysis and experimental confirmation of a tunable ring resonator that can independently change its resonant frequency and bandwidth. The tunable ring resonator comprises a ring resonator, three tunable capacitors, and switches. The resonant frequency changes according to the capacitance of tunable capacitors, and the bandwidth varies by changing the state of the switches. The unique feature of the resonator is that the resonant frequency remains steady when the bandwidth is changed. The fundamental characteristics are shown based on linear circuit simulation and electromagnetic simulation results. The resonator is fabricated using GaAs FET single-pole single-throw switches. The fabricated resonator changes the resonant frequency from 1.5 GHz to 2.0 GHz and the fractional bandwidth from 5% to 30%.