Patent ID: 6633206
Filing Date: 2003-10-14
Classification: H04B

Abstract:
A high-frequency switch comprising:a transmission terminal, an antenna terminal, a reception terminal, and a voltage-control terminal; a first diode, the cathode thereof being electrically connected to said transmission terminal, and the anode being electrically connected to said antenna terminal; a first transmission line, electrically connected between said antenna terminal and said reception terminal; a second diode, the cathode thereof being electrically connected to said reception terminal, and the anode being electrically connected to said voltage-control terminal via a resistor; a second transmission line, one end thereof being electrically connected to said transmission terminal, and the other end being electrically connected to ground so as to so as to permit conduction of DC to ground; and a capacitor, electrically connected between said voltage-control terminal and ground; wherein said high-frequency switch has an ON state in which a positive potential is applied to said voltage-control terminal to forward-bias the first and second diodes and permit a transmission signal having a transmission frequency to pass from the transmission terminal to the antenna terminal; and in said ON state, a self-inductance of the second diode resonates in series with said capacitor to provide a low impedance between said reception terminal and ground; wherein said transmission terminal, said reception terminal, said antenna terminal, said voltage-control terminal and at least one ground terminal are provided on an outside surface of a multilayered body; and wherein at least one of said transmission, reception and antenna terminals generates a bypass capacitance with said at least one ground terminal.