Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1978-09-29
1981-03-03
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
310313B, 333195, 333196, H03H 925, H03H 964, H03H 9145
Patent
active
042543878
ABSTRACT:
An acoustic wave resonator device comprises a substrate carrying a pair of spaced apart reflectors forming a resonant cavity that supports only three adjacent distinct resonant mode frequencies. An interdigital transducer is disposed on the substrate between the reflectors and includes an array of electrodes symmetrically arranged relative to a central point of the cavity to form a plurality of electrode pairs with the electrodes of each pair equally spaced on opposite sides of the central point. The central point of the cavity coincides with a node or an anti-node of the standing wave. If the two electrodes of each electrode pair are connected to the same terminal then the transducer has zero net coupling with one set of alternate modes of the cavity, whereas if said two electrodes are connected to opposite terminals then the transducer has zero net coupling with the other set of alternate modes.
REFERENCES:
patent: 3961293 (1976-06-01), Hartmann et al.
patent: 4072915 (1978-02-01), Mitchell
Lakin et al., "Surface Wave Resonators", 1975 Ultrasonics Symposium Proceedings, IEEE Cat. #75, CHO 994-4SU; pp. 269-278.
Mitchell Richard F.
Redwood Martin
Stevens Richard
White Philip D.
Briody Thomas A.
Franzblau Bernard
Nussbaum Marvin L.
Streeter William J.
U.S. Philips Corporation
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