Patent ID: 7904030

Claim:
A high frequency switch comprising: a first transmit-receive switch which switches transmission and reception signals via a first transmitting terminal and first and second receiving terminals and has a first diode being turned off at the time of transmission; a first low-pass filter suppressing high frequency distortion caused by said first diode at the time of said transmission; a second transmit-receive switch for switching transmission and reception signals via a second transmitting terminal and a third receiving terminal; and branching filter means of connecting said first and second transmit-receive switches to an antenna, wherein said first transmitting terminal is connected to said antenna via a second diode and said first low-pass filter, said second diode being in a forward direction at the time of said transmission, said second and third receiving terminals are connected to said antenna and are grounded respectively via a diode in a forward direction and a common ground resistor, and a second low-pass filter is provided, said second low-pass filter being inserted between said first transmitting terminal and an anode of said second diode to suppress high frequency distortion occurring at the time of said transmission.