| 摘要 |
A variable capacitor including a first electrode part, which is provided at a fixed part that includes a substrate, and a movable part, which has a second electrode part forming the capacity of said variable capacitor between itself and the first electrode part, and the movable part is displaced in response to a first drive signal to selectively go into an opposing status, in which the second electrode part opposes the first electrode part, and a non-opposing status, in which the second electrode part essentially does not oppose the first electrode part. This variable capacitor is able to obtain at least a two-value capacity in which the mutual ratio is large without specially requiring another capacitor or a switch, and it is able to obtain the desired capacity variation range by combining a plurality of capacitors.
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