Elastic surface wave recursive filter using a passive resonator

Details Elastic surface wave recursive filter using a passive resonator Elastic surface wave recursive filter using a passive resonator

H - Electricity

03

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333/58

H03H 9/64 (2006.01) H03H 9/54 (2006.01) H03H 9/145 (2006.01)

Patent

CA 1174303

ABSTRACT OF THE DISCLOSURE An elastic surface wave filter is described and comprises a substrate adapted to propagate elastic surface waves; a first tuned transducer and a second tuned transducer having a coefficient of transmission are both disposed on a substrate to form a passive resonator for the elastic surface waves; an extra trans- ducer is disposed on the substrate between the two trans- ducers and connected to an input of the filter to thereby introduce an elastic surface wave into the resonator whereby a resonator elastic surface wave is obtained in the resonator, partly transmitted through the second transducer and a transmitted elastic surface wave propa- gates on the output side of the second transducer; a transversal filter having a predetermined transfer func- tion without poles is disposed on the substrate on the output side of the second transducer for receiving the transmitted elastic surface wave.

379507

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