Patent ID: 8558639
Filing Date: 2013-10-15
Classification: H01P,H03K,H04B

Abstract:
1. A high frequency switch including a first switch circuit connected parallel to at least one first signal transmission line for transmitting a transmission signal from a transmission terminal, the first switch circuit having at least one first PIN diode, and a second switch circuit connected parallel to at least one second signal transmission line for transmitting a reception signal to a reception terminal, the second switch circuit having at least one second PIN diode, wherein in the first switch circuit, a first transmission line is connected in series to a circuit including the at least one first PIN diode while an anode of the first PIN diode is connected to the first transmission line, in the second switch circuit, a second transmission line is connected in series to a circuit including the at least one second PIN diode while an anode of the second PIN diode is connected to the second transmission line, cathodes of the PIN diodes are grounded at high frequencies, ends of resonant elements or resonant lines are connected to the cathodes of the PIN diodes, and other ends thereof are free ends, a first control terminal is electrically connected to one of the anode and the cathode of the first PIN diode, a first control voltage being supplied to the first control terminal, a second control terminal is electrically connected to one of the anode and the cathode of the second PIN diode, a second control voltage being supplied to the second control terminal, and a bias applying circuit is provided for applying a constant bias voltage to other of the cathodes and the anodes of the PIN diodes.