Patent ID: 6867662
Filing Date: 2005-03-15
Classification: H01P

Abstract:
1. A high-frequency switch comprising: a first transmission-reception switching circuit for selectively switching between a signal transfer between an antenna terminal and a first transmitting-circuit terminal and a signal transfer between the antenna terminal and a first receiving-circuit terminal; a second transmission-reception switching circuit for selectively switching between a signal transfer between the antenna terminal and a second transmitting-circuit terminal and a signal transfer between the antenna terminal and a second receiving-circuit terminal; a first diplexer disposed between the antenna terminal and the first transmission-reception switching circuit and between the antenna terminal and the second transmission-reception switching circuit; and a second diplexer connected to the second receiving-circuit terminal to selectively switch a signal transfer between the second receiving-circuit terminal and a third receiving-circuit terminal and a signal transfer between the second receiving-circuit terminal and a fourth receiving-circuit terminal by using a phase-shifting circuit and a surface-acoustic-wave filter, a third diplexer connected to the first receiving-circuit terminal in order to selectively switch a signal transfer between the first receiving-circuit terminal and a fifth receiving-circuit terminal and a signal transfer between the first receiving-circuit terminal and a sixth receiving-circuit terminal, the third diplexer including a phase-shifting circuit and a surface-acoustic-wave filter, wherein the first diplexer has a low-pass filter disposed between the antenna terminal and the first transmission-reception switching circuit and a high-pass filter disposed between the antenna terminal and the second transmission-reception switching circuit.