High frequency switch, two-band type high frequency switch, three-band type high frequency switch, and mobile communication equipment

摘要

A high frequency switch, has;a transmitting terminal;;a receiving terminal;;an antenna terminal;;a first diode having an anode electrically connected to the transmitting terminal and a cathode electrically connected to the antenna terminal;;a second diode having an anode connected through a transmission line of ¼ wavelength to the antenna terminal which is electrically connected to the receiving terminal, and having the side of a cathode grounded; and;a control terminal provided to a node between the transmitting terminal and the first anode,;wherein the first and second diodes have a tradeoff relationship between ON resistance thereof and capacitance between the anode and the cathode, and;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.