Patent ID: 7468642

Claim:
A multi-band band pass filter, comprising: first and second multi-order asynchronous resonators connected to each other by a coupling resonator and connected to respective first and second matching resonators, said first matching resonator connected to a signal-in terminal and second matching resonator connected to a signal-out terminal respectively; a first reference resonator connected between said signal-in terminal and a reference-in terminal and a second reference resonator connected between said signal-out terminal and a reference-out terminal, said first multi-order asynchronous resonator connected between said first matching resonator and said coupling resonator to said first reference terminal and said second multi-order asynchronous resonator connected between said second matching resonator and said coupling resonator to said reference-out terminal, said reference-in terminal connected to said reference-out terminal; and a feedback resonator connected between said signal-in terminal and said signal-out terminal.