Patent ID: 7545081

Claim:
A piezoelectric radio frequency (RF) micro electro mechanical system (MEMS) device comprising: an upper substrate comprising a plurality of via holes and an RF output signal line which is connected to a first contact pad formed on a first via hole of the plurality of via holes; a piezoelectric actuator positioned below the RF output signal line; and a lower substrate comprising a cavity so that one end of the piezoelectric actuator is fixed to the lower substrate and the other end is movably spaced apart from the upper and lower substrates, wherein the piezoelectric actuator comprises an RF input signal line and a second contact pad which is provided to connect the RF output signal line with the RF input signal line when the piezoelectric actuator is driven upward, wherein the RF input signal line is connected to a third contact pad formed on a second via hole of the plurality of via holes, and wherein the plurality of via holes are formed on an upper surface of the upper substrate so that the first and the third contact pads are configured to be connected to each other through the RF output signal line and the RF input signal line when the piezoelectric actuator is driven upward.