Patent ID: 8294537
Filing Date: 2012-10-23
Classification: H01P

Abstract:
1. A variable resonator, comprising: a ring-shaped conductor line provided on a dielectric substrate and having a circumferential length of a wavelength or an integral multiple of the wavelength at a resonance frequency of the variable resonator; and at least two first circuit switches, wherein each of said at least two first circuit switches has one end electrically connected to said ring-shaped conductor line and an other end electrically connected to a ground conductor formed on the dielectric substrate, and each of said at least two first circuit switches is configured to select interchangeably electrical connection or electrical disconnection between said ground conductor and said ring-shaped conductor line; positions on said ring-shaped conductor line, each of which is electrically connected to said one end of a corresponding one of said at least two first circuit switches, are different from one another; only one of said at least two first circuit switches is selected to turn to an on-state; and a bandwidth at the resonance frequency changes in response to a change of said selection of said only one of said at least two first circuit switches with said resonance frequency being constant.