Patent ID: 7675383

Claim:
A switch circuit, comprising: a substrate including a cavity; a second electrode formed to a surface of the cavity; a second inductor formed to the surface of the cavity; a support film formed on the substrate to cover a space of the cavity; a first electrode formed on the support film; a first input and output terminal formed on the support film; a first inductor which is formed on the support film and connected with the first input and output terminal; a capacitor which is formed on the support film and connected with the first inductor; a second input and output terminal which is formed on the support film and connected with the capacitor; and first and second MEMS switches for displacing the support film by an electrostatic force acting between the second electrode and the first electrode in response to a control signal applied to the second electrode to make one end of the first inductor and one end of the second inductor into one of a contact state and a non-contact state and to make the second input and output terminal and the other end of the second inductor into the one of the contact state and the non-contact state, wherein a relationship of f=1/(2π√CL 1 )=1/(2π√CL 2 ) is satisfied, where L 1 is an inductance of the first inductor, L 2 is an inductance of the second inductor, C is a capacitance of the capacitor, and f is a use frequency.