Patent ID: 8044751

Claim:
A switchable bandpass filter having stepped-impedance resonators loaded with diodes, comprising: a first stepped-impedance resonator; a second stepped-impedance resonator wireles sly coupled to the first stepped-impedance resonator; a third stepped-impedance resonator wirelessly coupled to the second stepped-impedance resonator; a first diode connected to one end of the third stepped-impedance resonator; a fourth stepped-impedance resonator wirelessly coupled to the third stepped-impedance resonator; a second diode connected to one end of the fourth stepped-impedance resonator; a fifth stepped-impedance resonator wireles sly coupled to the second stepped-impedance resonator; a third diode connected to one end of the fifth stepped-impedance resonator; a sixth stepped-impedance resonator wireles sly coupled to the fifth stepped-impedance resonator; and a fourth diode connected to one end of the sixth stepped-impedance resonator, wherein switching signals from the stepped-impedance resonators combine to guide an input signal to one of a plurality of output ports.