Patent ID: 7173471

Claim:
A high frequency switching circuit, comprising: a plurality of switching circuit sections arranged between a plurality of input/output terminals which output and input a high frequency signal, wherein: each of said plurality of switching circuit sections is comprised of a circuit consisting of a plurality of field effect transistors connected in series, and a gate control voltage is applied to gate terminals of said plurality of field effect transistors, so that an on-state and an off-state are achieved, a drain control voltage is further applied to drain terminals or source terminals of said plurality of field effect transistors of each of said plurality of switching circuit sections, a voltage according to an electric power value of the high frequency signal supplied to said plurality of switching circuit sections is supplied as said gate control voltage and said drain control voltage, and the drain control voltage supplied to said plurality of switching circuit sections is a voltage given by a logical-OR of the gate control voltage supplied to said plurality of switching circuit sections.