Surface acoustic wave device having improved multi-strip coupler

Details Surface acoustic wave device having improved multi-strip coupler Surface acoustic wave device having improved multi-strip coupler

1982-04-02

1983-11-22

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333153, 333195, 310313D, H03H 942, H03H 964, H03H 9145

Patent

active

044172214

ABSTRACT:
A surface acoustic wave (SAW) device is disclosed. The SAW device includes input and output transducers disposed in spaced acoustic tracks on a piezoelectric substrate material, and a multi-strip coupler for translating the acoustic beam generated by the input transducer into the acoustic track in which the output transducer is located. The multi-strip coupler is designed so as to minimize the influence of Fresnel peaks found to exist in the amplitude profile of the acoustic beam in the output acoustic track. The multi-strip coupler is longer than in the past, and includes a central fanned region for providing well defined acoustic boundaries whose locations do not vary from device to device.

REFERENCES:
patent: 3947783 (1976-03-01), Maerfeld
patent: 4166987 (1979-09-01), Coldren
patent: 4357584 (1982-11-01), Murray et al.
patent: 4369390 (1983-01-01), Malocha et al.
patent: 4370633 (1983-01-01), Schofield

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