Resonator

A resonator, comprising:

• a substrate formed from a dielectric or a semiconductor;
• an input line, formed on the substrate, configured to receive a signal inputted into the input line;
• a resonant line, formed on the substrate, coupled to said input line and configured to resonate with the signal inputted into said input line;
• an output line, formed on the substrate, coupled to said resonant line and configured to receive an output of said resonant line;
• a ground formed on the substrate;
• at least one counter electrode arranged on a same side of the substrate as the resonant line so as to overlap said resonant line with a space in between in a direction perpendicular to said substrate, and configured to form a reactance between the resonant line and the at least one counter electrode;
• at least one supporting member configured to support the at least one counter electrode on said substrate;
• and
• at least one conductor between the at least one counter electrode and the ground,
• wherein said resonant line has a main resonant line part with a first width W1 as a line width in a direction parallel to said input and output lines, and widened parts with a second width W2 wider than the width W1,
• the main resonant line part and the widened parts are alternately arranged at least once, and
• said at least one counter electrode is arranged to face said widened parts having the second width W2.

A resonator, comprising:

• a substrate formed from a dielectric or a semiconductor;
• an input line, formed on the substrate, configured to receive a signal inputted into the input line;
• a resonant line, formed on the substrate, coupled to said input line and configured to resonate with the signal inputted into said input line;
• an output line, formed on the substrate, coupled to said resonant line and configured to receive an output of said resonant line;
• a ground formed on the substrate;
• at least one counter electrode arranged on a same side of the substrate as the resonant line so as to overlap said resonant line with a constant space in between in a direction perpendicular to said substrate, and configured to form a reactance between the resonant line and the at least one counter electrode;
• at least one supporting member configured to support the at least one counter electrode on said substrate;
• at least one switch configured to control whether the at least one counter electrode is connected to the ground or not;
• and
• at least two conductors connecting the at least one counter electrode to one port of the at least one switch and connecting another port of the at least one switch to the ground.