Patent ID: 6856187

Claim:
A high frequency switch module, comprising: a discriminating filter which discriminates a receive signal into a high-band receive signal and a low-band receive signal, and respectively outputs the signals to a high-band input/output port and a low-band input/output port, and combines a high-band transmit signal input to the high-band input/output port with a low-band transmit signal input to the low-band input/output port; a low-band high frequency switch for switching an operation of feeding the low-band receive signal from the low-band input/output port to a low-band receiving port and an operation of feeding the low-band transmit signal fed to a low-band transmitting port to the low-band input/output port; and a high-band high frequency switch for switching an operation of feeding the high-band receive signal from the high-band input/output port to a high-band receiving port and an operation of feeding the high-band transmit signal fed to a high-band transmitting port to the high-band input/output port, wherein said high-band high frequency switch comprises: a first switch element connected between the high-band input/output port and the high-band transmitting port; a second switch element with one end connected to the high-band receiving port and the other end grounded; a high-band 90-degree phase shifter connected between the high-band input/output port and the high-band receiving port; and a high-band control port for controlling on-off operations of said first switch element and said second switch element; wherein said low-band high frequency switch comprises: a third switch element connected between the low-band input/output port and the low-band transmitting port; a fourth switch element with one end connected to the low-band receiving port and the other end grounded; a low-band 90-degree phase shifter connected between the low-band input/output port and the low-band receiving port; and a low-band control port for controlling on-off operations of said third switch element and said fourth switch element, and wherein at least one of said high-band 90-degree phase shifter and said low-band 90-degree phase shifter comprises: a high-pass filter circuit; and a choke line parallel-connected to said high-pass filter circuit, which is a conducting path of control voltage applied from the high-band control port or the low-band control port.