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|1. (WO2018203521) DUAL-BAND RESONATOR AND DUAL-BAND BANDPASS FILTER USING SAME|
|Applicants:||TOKYO KEIKI INC.
THE JAPAN STEEL WORKS, LTD.
UNIVERSITY OF YAMANASHI
|Title:||DUAL-BAND RESONATOR AND DUAL-BAND BANDPASS FILTER USING SAME|
Provided is a dual-band resonator which can be downsized further than conventional ones. A dual-band resonator 10 is provided with a first conductor 20 and a second conductor 30. The first conductor 20 is configured to be folded at a first folding part 21 at the center so that both extensions are in a prescribed direction and adjacent to one another with a prescribed space therebetween, wherein a conductor part 26 closer to one end 28 side than the first folding part 21 and a conductor part 27 closer to the other end 29 side than the first folding part 21 are further folded at second folding parts 22 between the one end 28 and the first folding part 21 and between the other end 29 and the first folding part 21, respectively, in a direction in which the one end 28 and the other end 29 are apart from each other. The second conductor 30 extends in a prescribed direction contiguously to the first folding part 21 of the first conductor 20. The first conductor 20 constitutes a half-wavelength resonator, and odd-mode resonance occurs in the first conductor 20. The first conductor 20 and the second conductor 30 constitute a half-wavelength resonator, and even-mode resonance occurs in the first conductor 20 and the second conductor 30.