Saw multiplexer using tapered transducers

Details Saw multiplexer using tapered transducers Saw multiplexer using tapered transducers

1987-06-24

1988-05-24

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

324 77B, 333154, 333193, 310313B, H03H 9145, H03H 964

Patent

active

047468823

ABSTRACT:
A simple compact, high performance SAW multiplexer is provided by utilizing an input transducer in which hyperbolic tapered electrode fingers are provided. These hyperbolic electrode fingers provide a low frequency output acoustic wave at locations where the spacing between the fingers is relatively large, and a higher frequency signal at points where the spacing is relatively closer. A series of pickup taps which are preferably located on both sides of the input transducer which are also constructed with hyperbolically tapered fingers, but these pickup elements are separated into segments, and isolated by ground straps so that each pickup finger pad will be responsive only to a portion of the frequencies launched by the input transducer. The frequency of the pickup pads varies from a low frequency to a high frequency in alternate manner from one side of the multiplexer to the other.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3727718 (1973-04-01), Whitehouse
patent: 3753164 (1973-08-01), DeVries
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patent: 4049982 (1977-09-01), Cohen
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patent: 4166228 (1979-08-01), Solie
patent: 4477784 (1984-10-01), Maerfeld et al.
patent: 4499393 (1985-02-01), Stokes et al.
patent: 4521751 (1985-06-01), Riha et al.
patent: 4633117 (1986-12-01), Bloch et al.
patent: 4635008 (1987-01-01), Solie

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