Saw filter including multistrip coupler with varied widths

Details Saw filter including multistrip coupler with varied widths Saw filter including multistrip coupler with varied widths

1995-06-06

1996-10-15

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333193, 310313D, 310313R, H03H 964

Patent

active

055658253

ABSTRACT:
A surface acoustic wave device for propagating a surface acoustic wave having input and output transducers and a multistrip coupler formed on the surface of a substrate. The input and output transducers each have two opposite electrodes having a plurality of electrode fingers extending toward their opposites and meshing with the electrode fingers of their opposites. The multistrip coupler has strip lines of a configuration wherein portions of at least some of the coupler strip lines are more widely spaced from adjacent patterns than other portions of the coupler strip lines. The width of these more widely spaced portions of at least one of the coupler strip lines which are more widely spaced from adjacent patterns is made larger than the width of the other portions of the at least one coupler strip line to compensate for the thinning effect of the lithography process. In one preferred embodiment, the portion of the at least one coupler strip line whose width is made larger is positioned so that it is not adjacent to the pattern of the input or output transducers.

REFERENCES:
patent: 4370633 (1983-01-01), Schofield
patent: 5185548 (1993-02-01), Egara et al.
patent: 5396199 (1995-03-01), Tera et al.

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