Patent ID: 8106727

Claim:
A variable resonator, comprising: a single loop conductor line provided on one surface of a dielectric substrate; a ground conductor provided on either said one surface or an other surface opposite to said one surface of said dielectric substrate; at least two switches; and at least three variable reactance blocks each being configured to permit a change of a reactance value, wherein each of said at least two switches has one end electrically connected to said single loop conductor line and an other end electrically connected to said ground conductor, and is configured to select interchangeably electrical connection or electrical non-connection between said ground conductor and said single loop conductor line; connection positions on said single loop conductor line where said at least two switches are connected are different from each other; said single loop conductor line has a resonance frequency whose one wavelength or an integral multiple thereof corresponds to a circumference length of the single loop conductor line; said at least three variable reactance blocks are electrically connected as branching circuits to connection points on said single loop conductor line at an equal electrical length interval based on said resonance frequency; and said at least two switches are distinct from said at least three variable reactance blocks.