Patent ID: 6472957
Filing Date: 2002-10-29
Classification: H03H

Abstract:
A switchable filter for passing one of a plurality of frequency bands comprising:a filter input terminal; a filter output terminal; n bandpass filter sections, wherein each of the n bandpass filter sections is coupled between the filter input terminal and the filter output terminal, and wherein each of the n bandpass filter sections is arranged to pass a different frequency band; n switches each coupled to a respective one of the n bandpass filter sections, wherein each of the n switches is operable for assuming either an OFF state for activating a corresponding one of the n bandpass filter sections or an ON state for deactivating the corresponding one of the n bandpass filter sections, wherein the n switches are arranged and controlled so that, when any one of the n switches is operated to its OFF state, the remaining nâˆ’1 switches are operated to their ON states and form a series circuit for conducting a common current, and wherein n&gE;3.