Patent Number: 7,825,754

Title: Variable resonator

Abstract: A variable resonator has a dielectric substrate 2, an input/output line 3 formed on the dielectric substrate 2, a first resonator 4 that has one end connected to the input/output line 3 and the other end grounded, and a second resonator that has one end connected to the input/output line 3 at the point of connection of the one end of the first resonator 4 and the other end grounded via a terminal switch 7. When the terminal switch 7 is turned off, resonance occurs at a frequency at which the sum of the line lengths of the first resonator 4 and the second resonator 6 equals to a quarter of the wavelength. When the terminal switch 7 is turned on, resonance occurs at a frequency at which a half of the sum of the line lengths equals to a quarter of the wavelength.

Inventors: Kawai; Kunihiro (Yokohama, JP), Fukuda; Atsushi (Yokohama, JP), Okazaki; Hiroshi (Yokosuka, JP), Narahashi; Shoichi (Yokohama, JP)

Assignee: NTT DoCoMo, Inc.

International Classification: H01P 7/08 (20060101); H01P 1/203 (20060101)

Expiration Date: 2019-11-02 0:00:00