Surface acoustic wave bandpass filter

Details Surface acoustic wave bandpass filter Surface acoustic wave bandpass filter

1983-01-24

1984-12-25

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

310313B, 333196, H03H 964, H03H 925

Patent

active

044906986

ABSTRACT:
A surface acoustic wave bandpass filter has a piezoelectric substrate for propagating a surface acoustic wave. An input transducer is formed on the substrate, with a pair of interdigital electrodes, for exciting a surface acoustic wave in response to an electrical signal. An output transducer is also formed on the substrate, with essentially the same structure for developing a filtered electrical signal from the surface acoustic wave propagated in the substrate. The input and output transducers are arranged so that the distance between them (L) satisfies the relationship: .lambda./2 n<L<.lambda./2 (n+1) (n is a positive integer), and .lambda./2 represents the distance between the centers of adjacent electrode fingers.

REFERENCES:
patent: 3446975 (1969-05-01), Adler et al.
patent: 3582840 (1971-06-01), DeVries
A "Far Proximity" Photolithographic Process For Semiconductor Manufacture; Proceedings Eastman Kodak Co. Oct. 19-21, 1975, Monterey, California.
SAW Difraction Analyses by Paired Echo Superposition (IEEE vol. SU-23 No. 4, Jul. 4, 1976).

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