Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1975-08-18
1977-02-01
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
310 82, 310 98, 333 30R, H03H 904, H03H 926, H03H 932, H01L 4110
Patent
active
040064387
ABSTRACT:
An improved miniaturized electro-acoustic surface-wave filter device is disclosed having broad, deep, adjacent channel stopbands from uniform aperture transducers. The device includes two spaced, interdigital electrode transducer structures fabricated on one surface of a piezoelectric substrate. Each electrode structure includes a central finger group and a number of flanking finger groups spaced from the central finger group at predetermined temporal locations. The strengths of the flanking groups are adjusted by controlling the number of finger pairs within a group, the overlap length of the fingers, and the strip/gap ratio of the fingers. Aperture uniformity is maintained in reduced overlap flanking groups through the series weighting technique. The subject device is particularly useful for channel selection in the IF portion of a television receiver.
REFERENCES:
patent: 3727155 (1973-04-01), De Vries
patent: 3801937 (1974-04-01), Bristol
patent: 3872410 (1975-03-01), Zucker
Moulic et al.--"Surface Acoustic Wave Harmonic Response Cancellation Technique" in IBM Technical Disclosure Bulletin, July 1975; pp. 521-522.
Holland et al.--"Practical Surface Acoustic Wave Devices" in Proceedings of the IEEE vol. 62, No. 5, May 1974; pp. 582-586.
AMP Incorporated
Egan Russell J.
Nussbaum Marvin
Smith Alfred E.
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