Patent ID: 7492238

Claim:
A radio-frequency switching circuit for controlling a transmission of a radio-frequency signal by changing a connection status between a common terminal and a plurality of independent terminals, the radio-frequency switching circuit comprising: a plurality of common switching sections each having a first terminal to be connected, for a radio-frequency component, to the common terminal; a plurality of fundamental switching sections, which are provided respectively corresponding to the plurality of independent terminals, each having a first terminal connected to a second terminal of any one of the plurality of common switching sections and having a second terminal to be connected, for the radio-frequency component, to any one of the plurality of independent terminals, wherein a common switching section for transmission is provided on transmission paths, through which radio-frequency signals respectively from transmission terminals among the plurality of independent terminals are transmitted to the common terminal, and a common switching section for reception is provided on reception paths, through which radio-frequency signals from the common terminal are respectively received by reception terminals among the plurality of independent terminals; a common shunt circuit for transmission for controlling grounding of the second terminal of the common switching section for transmission; and a common shunt circuit for reception for controlling grounding of the second terminal of the common switching section for reception, wherein the common shunt circuit for transmission is structured by serially connected switching elements, a number of which is same as a number of switching elements by which each of a plurality of fundamental switching sections for transmission connected to the common shunt circuit for transmission is structured, and the common shunt circuit for reception is structured by serially connected switching elements, a number of which is same as a number of switching elements by which each of a plurality of fundamental switching sections for reception connected to the common shunt circuit for reception is structured.