Patent ID: 7885614

Claim:
Antenna switch which is arranged to alternately operate in a receive mode and a transmit mode, the antenna switch comprising: an adaptive filter for coupling a signal processing means to an antenna during the receive mode and for electrically insulating the signal processing means from the antenna during the transmit mode, wherein the adaptive filter comprises a circuit arrangement of at least one capacitor and at least one inductor, wherein: a group of circuit components of the circuit arrangement implements a transmit filter stage with a first passband during the transmit mode, wherein the first passband is a band-pass passband, wherein the a high-pass filter coupled between the antenna and switches for the signal processing means; and a series arrangement of an inductor, a capacitor, and an inductor switch that are coupled in parallel with the high-pass filter; and a subset of the group of circuit components of the circuit arrangement implements a receive filter stage with a second passband during the receive mode, wherein the subset of the group of circuit components of the receive filter stage comprises the high-pass filter coupled between the antenna and switches for the signal processing means.