Patent ID: 8169008

Claim:
A radio frequency module for use in a mobile communication device, including: a power amplifier circuit for transmission of a radio frequency signal; and an antenna switch circuit coupled to the power amplifier circuit, which is used for switching transmission and reception of radio frequency signals, wherein the antenna switch circuit is comprised of a high electron mobility transistor (HEMT), wherein the HEMT includes: a channel layer formed in an active region surrounded by an element separation region on a main surface of a substrate; an electron supplying layer formed on the channel layer; a gate electrode Schottky-connected to the electron supplying layer; a source electrode and a drain electrode ohmic-connected to the electron supplying layer, wherein each of the source electrode and the drain electrode comprises a first portion and a plurality of second portions, the first portion of the source electrode and the first portion of the drain electrode extend along a first direction, the gate electrode is located between the first portion of the source electrode and the first portion of the drain electrode, the plurality of second portions of the source electrode and the plurality of second portions of the drain electrode extend along a second direction perpendicular to the first direction, each of the plurality of second portions of the source electrode and each of the plurality of second portions of the drain electrode are disposed side by side in a plan view, the gate electrode continuously extends between the source electrode and the drain electrode, the gate electrode includes a first portion, a second portion and a third portion, which are connected each other, the first portion of the gate electrode extends between each of the plurality of second portions of the source electrode and each of the plurality of second portions of the drain electrode along the second direction, the second portion of the gate electrode extends between each of the plurality of second portions of the drain electrode and the first portion of the source electrode along the first direction, the third portion of the gate electrode extends between each of the plurality of second portions of the source electrode and the first portion of the drain electrode along the first direction, and the first, second and third portions of the gate electrode are located inside the active region in a plan view.