| 摘要 |
To stably change capacitance for a change in temperature by constantly warping a movable part, whereby reliability is enhanced. <??>A movable part 6 is provided above a substrate 2 by using supporting portions 4, support beams 7, etc., so as to be displaced. An insulating film 8 and a movable electrode 9 are provided on a conductor facing surface 6A of the movable part 6. A driving electrode 13 is used to displace the movable part 6, etc., between a signal cutoff position and a signal passage position, whereby a high frequency signal transmitted through a transmission line 3 is cut off or allowed to pass. In this case, the insulating film 8 uses its compressive stress to warp the movable part 6 and the movable electrode 9 in a direction of warping in a convex form toward the transmission line 3, and constantly keeps this warping direction. This can prevent the capacitance between the movable electrode 9 and the transmission line 3 from being varied by change in the warping direction of the movable part 6, etc., which is caused by an increase or decrease in temperature, and makes it possible to perform a stable switching operation. <IMAGE>
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