Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1981-11-18
1983-07-12
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333151, 333154, 333195, H03H 9145, H03H 964, H03H 942
Patent
active
043933580
ABSTRACT:
In a surface acoustic wave filter which employs a multi-strip coupler to offset the acoustic wave path, diffraction effects lead to spurious responses at a filter trap frequency. The diffracted wavefronts are curved, instead of being straight and parallel to the transducer fingers as are the wavefronts of the strip-coupled acoustic signal. Thus an additional transducer is employed which has fingers slanted at the same angle as the local wavefronts of the diffracted acoustic energy. The resulting parallel relationship permits the additional transducer to be designed so that it compensates for the undesired trap frequency response by producing an equal magnitude, oppositely phased trap frequency output. In order to conserve substrate area, a technique is disclosed for locating the compensating transducer within a dummy area of an apodized main receiving transducer.
REFERENCES:
patent: 3908137 (1975-09-01), Hunsinger et al.
patent: 4004254 (1977-01-01), De Vries
patent: 4263569 (1981-04-01), Moellmer
patent: 4342011 (1982-07-01), Iwamoto et al.
patent: 4350963 (1982-09-01), Iwamoto et al.
Nussbaum Marvin L.
Zenith Radio Corporation
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