Spatially varying multiple electrode acoustic wave filter and me

Details Spatially varying multiple electrode acoustic wave filter and me Spatially varying multiple electrode acoustic wave filter and me

1991-11-18

1994-05-03

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 310313B, H03H 9145, H03H 964

Patent

active

053091264

ABSTRACT:
An electronic apparatus for receiving and filtering high frequency waves comprises a sequence of T electroacoustic transducers each having multiple interdigital electrode fingers and a centerline located equidistant between its outermost electrode fingers. For a centerline-to-centerline distance of a first adjacent pair of transducers D.sub.1, and centerline-to-centerline distances of other adjacent pairs of transducers D.sub.2 to D.sub.T-1, then at least some of D.sub.2 to D.sub.T-1 differ from D.sub.1 by a non-integral number of wavelengths. The transducer array is symmetrical about a centerline and the number of fingers in each transducer varies, with an input or output transducer closer to either end of the sequence having more fingers than a like kind transducer nearer the center.

REFERENCES:
patent: 3582838 (1971-06-01), DeVries
patent: 3596211 (1971-07-01), Dias
patent: 3868608 (1975-02-01), Williams
patent: 4468642 (1984-08-01), Hikita
patent: 4492940 (1985-01-01), Hikita
patent: 4649357 (1987-03-01), Nagai et al.
patent: 4931755 (1990-06-01), Sakamoto et al.
patent: 5130681 (1992-07-01), Ohnuki et al.
Lewis, Merion, "SAW Filters Employing Interdigitated Interdigital Transducers, IIDT", Royal Signals and Radar Establishment, Malvern, Worcestershire, United Kingdom, 1982 Ultrasonics Symposium, pp. 12-17.

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