Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1979-10-15
1981-11-03
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333195, 333196, H03H 964, H03H 970, H03H 976
Patent
active
042988497
ABSTRACT:
A three-transducer SAW filter is disclosed that includes a central input transducer requiring only one-half of the interdigital fingers normally required by prior art three-transducer SAW filters. As a result, two input transducers may now be provided in the space normally occupied by one prior art input transducer. The only requirement is that each input transducer have an axis of symmetry about which surface waves are propogated symmetrically. Since each input transducer may have a different frequency response, a dual-passband SAW filter may now be provided in the space normally occupied by a single prior art SAW filter. Furthermore, a multi-passband SAW filter may be provided by arranging pairs of input transducers between three or more output transducers which are electrically coupled in parallel. In addition, the input and output connections of a multi-passband SAW filter may be interchanged such that an input signal, applied to the parallel connected output transducers is frequency sorted by the passbands of each of the input transducers.
REFERENCES:
patent: 3582838 (1971-06-01), DeVries
patent: 3582840 (1971-06-01), DeVries
patent: 3600710 (1971-08-01), Adler et al.
patent: 3836876 (1974-09-01), Marshall et al.
patent: 3859608 (1975-01-01), Hartmann et al.
patent: 3921093 (1978-11-01), Lewis
patent: 3970970 (1976-07-01), Worley
patent: 4044321 (1977-08-01), Vasile
patent: 4047130 (1977-09-01), Lim et al.
patent: 4063202 (1977-12-01), Vasile
Parker et al.-"A Saw Oscillator Using Two Acoustic Paths", 1976 Ultrasonics Symposium Proceedings, IEEE Cat. No. 76 CH1120-5SU, 1976; pp. 243-247.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Nussbaum Marvin L.
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