Patent ID: 6835968
Filing Date: 2004-12-28
Classification: H01L,H01P

Abstract:
A two-band type of high frequency switch, comprising:a first high frequency switch for use in a first frequency band; a second high frequency switch for use in a second frequency band higher than the first frequency band; and a diplexer for sharing the same antenna between said first high frequency switch and said second high frequency switch by multiplexing and demultiplexing said first frequency band and second frequency band, each of the first and second high frequency switches including: a transmitting terminal; a receiving terminal; an antenna terminal coupled to said diplexer; a first diode having an anode electrically connected to said transmitting terminal and a cathode electrically connected to said antenna terminal; a second diode having an anode connected through a Â¼ wavelength transmission line to the antenna terminal and electrically connected to said receiving terminal, said second diode having a cathode connected to ground; and a control terminal provided to a node between said transmitting terminal and said first diode, in which the ON resistance of the first diode is lower than the ON resistance of the second diode, and the capacitance of the second diode in the OFF state is smaller than the capacitance of the first diode in the OFF state.