Dispersive SAW filter with tapered transducers

Details Dispersive SAW filter with tapered transducers Dispersive SAW filter with tapered transducers

1985-11-19

1987-01-06

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333153, 333154, 333196, 310313D, H03H 964

Patent

active

046350080

ABSTRACT:
A dispersive Surface Wave Acoustic (SAW) filter is provided by a dispersive reflective array, and input and output transducers that we aligned with respect to the array so that the angle of incidence of a SAW from the input transducer is approximately equal to the angle of reflection from the reflective array over the entire range of the dispersive array, wherein the transducers are constructed to provide a frequency response which is matched to the periodicity of the dispersive array. Such design may be accomplished by forming the transducers with hyperbolically curved electrode fingers. The transducers may consist of relatively narrower inner electrode fingers and relatively wider outer electrode fingers. The transducers may also be divided into a plurality of tracks with each of the tracks being subdivided into a plurality of subtransducer elements which are capacitively coupled in electrical series.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3753164 (1973-08-01), De Vries
patent: 3975697 (1976-08-01), Paige
patent: 4166228 (1979-08-01), Solie
patent: 4477784 (1984-10-01), Maerfeld et al.
patent: 4521751 (1985-06-01), Riha et al.
N. J. Slater and C. K. Campbell, Improved Modeling of Wide-Band Linear Phase SAW Filters Using Transducers with Curved Fingers, IEEE Transactions on Sonics & Ultrasonics, vol. Su-31, No. 1, Jan. 1984, pp. 46-50.
P. M. Naraine and C. K. Campbell, Wide Band Linear Phase SAW Filters Using Apodized Slanted Finger Transducers, 1983 IEE Ultrasonics Symposiu, pp. 113-116.

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