Patent ID: 8253483

Claim:
A high-frequency switch module comprising: a high-frequency switch that includes high-frequency terminals, a control terminal, a power supply terminal, and ground terminals and that is arranged to cause specific ones of the plurality of the high-frequency terminals to be selectively electrically connected to one another; and a multilayer substrate having a rectangular or substantially rectangular plate shape and including insulators and electrodes alternately stacked therein; wherein top surface connection electrodes to which the respective terminals of the high-frequency switch are connected are arranged on a top surface of the multilayer substrate, bottom surface connection electrodes which are connected to a circuit substrate to which the high-frequency switch module is mounted are arranged on a bottom surface of the multilayer substrate, and wiring electrodes that electrically connect the top surface connection electrodes to the bottom surface connection electrodes are located within the multilayer substrate; the ground terminals include a high-frequency circuit ground terminal and a control circuit ground terminal; the multilayer substrate includes therein a ground electrode electrically connected to the top surface connection electrode to which the high-frequency circuit ground terminal is connected; and the wiring electrode electrically connected to the top surface connection electrode to which the control circuit ground terminal is connected is arranged so as to be insulated from the ground electrode.