| 摘要 |
A variable resonator that comprises a loop line ( 902 ) to which two or more switches ( 903 ) are connected and N of reactance circuits ( 102 ) (N>=3), in which switches ( 903 ) are severally connected to different positions on the loop line ( 902 ), the other ends of the switches are severally connected to a ground conductor, and the switches are capable of switching electrical connection/non-connection between the ground conductor and the loop line ( 902 ), the reactance circuits ( 102 ) severally have the same reactance value, the loop line ( 902 ) has a circumference corresponding to one wavelength or integral multiple thereof at a resonance frequency corresponding to each reactance value of each reactance circuit, and the reactance circuits ( 102 ) are electrically connected to the loop line ( 902 ) as branching circuits along the circumference direction of the loop line ( 902 ) at equal electrical length intervals.
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