Patent ID: 6332071
Filing Date: 2001-12-18
Classification: H01P,H04B

Abstract:
An antenna switch comprising at least one signal path, including amplifier means coupled to respective switching means, said amplifier means comprising an amplifier having an output terminal that is connected to a first terminal of a first inductor, a second terminal of the first inductor being connected to a first terminal of a first capacitor, a second terminal of the first capacitor being grounded, said amplifier being voltage supplied via a choke inductor, said switching means comprising receiving isolation means having an input terminal connected to the second terminal of the first inductor and to the first terminal of the first capacitor, and an output terminal which is connected to a first terminal of a coupling capacitor, the second terminal of the coupling capacitor being connected to an antenna via a low pass filter, and a first microstrip having a first terminal connected to said first terminal of the coupling capacitor and to the output terminal of the receiving isolation means, and a second terminal connected to DC switching means, wherein said first inductor and said first capacitor together with a shorted output transistor of said amplifier form a high impedance in a receiving mode, thereby not affecting the receiving signal in the receiving mode, and said receiving isolation means is a signal wire.