The basic structure of MEMS switch consists of three layers which are Glass-Silicon- Glass, as shown
Fig. 2. It has a SPST contact configuration, “1a”, normally open type. The top glass part is used for
protecting the actuator and hermetic sealing. The middle silicon section contains the actuator and
movable electrode. A capacitor is built up between the fixed electrode and movable electrode. The
signal line and fixed electrode are made on a glass base. When applying the voltage between Fixed
Electrode and Movable Electrode, an electrostatic force is generated and it pulls in the Movable
Electrode (actuator). When the driving voltage becomes OFF, the electrostatic force will disappear, and
then the actuator will go back to the original position because of a self-restoring force. The signal line
and the movable contact consist of pure metal wiring, and serve as a mechanical switch which can
handle DC to High Frequency signals