Patent ID: 8232808

Claim:
A switch circuit for switching whether to output an input signal, comprising: a transmission path that transmits the input signal from an input end to an output end of the switch circuit; a first semiconductor switch that is provided on the transmission path and switches whether to transmit the input signal; a second semiconductor switch, comprising a first end and a second end, wherein the second semiconductor switch switches whether to open or short circuit between the first end and the second end, wherein the first end of the second semiconductor switch is connected to a point on the transmission path between the first semiconductor switch and the output end of the switch circuit, and the second end of the second semiconductor switch is connected to a ground potential, wherein the second semiconductor switch is opened when the first semiconductor switch is short-circuited, and wherein the second semiconductor switch is short-circuited when the first semiconductor switch is opened; a capacitor having a predetermined capacitance, one end of the capacitor being connected to the point on the transmission path between the first semiconductor switch and the output end of the switch circuit and another end of the capacitor being connected to the first end of the second semiconductor switch, wherein the second semiconductor switch and the capacitor are connected in series between the transmission path and the ground potential; a voltage controller, including a bias application circuit connected to a point between the capacitor and the first end of the second semiconductor switch, configured to control the bias application circuit to apply a bias voltage to the point between the capacitor and the first end of the second semiconductor switch when the second semiconductor switch is opened; and an inductor, having a predetermined inductance, that is provided between the bias application circuit and the point between the capacitor and the first end of the second semiconductor switch.