Patent ID: 6859117

Claim:
A resonator filter cascade comprising: first and second resonator filters each including: sequentially adjacent first, second and third resonator structures forming a surface acoustic waveguide; said first resonator structure having at least a first coupling transducer with a first connection bus bar which operates as one of an output and input; said third resonator structure having at least a second coupling transducer with a second connection bus bar which operates as one of an output and input; said first connection bus bar and said second connection bus bar being unconnected with one another; and said second resonator having an input/output transducer for receiving or outputting signals; said first resonator filter having said input/output transducer as an input transducer, and said first and second connection bus bars of said first and second coupling transducers as outputs; said second resonator filter having said input/output transducer as an output transducer, and said first and second connection bus bars of said first and second coupling transducers as inputs; and electrical connections respectively connecting: said first and second connection bus bars of said first and second coupling transducers of said first resonator filter; to said first and second connection bus bars of said first and second coupling transducers of said second resonator filter.