Surface acoustic wave reflectors with weighted arrays of segmented and non-segmented lineal elements
First Claim
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1. Apparatus for reflecting an acoustic surface wave comprising:
- a substrate for supporting a surface acoustic wave at a surface thereof,first and second reflector sections in side-by-side parallel cooperative relation affixed at said surface,said first reflector section including a plurality of lineal reflector elements extending in spaced parallel relation across the path of said acoustic surface wave for reflecting a first portion thereof,said second reflector section including a plurality of segmented reflector elements extending normal to said path, each in parallel relation with said lineal reflector elements, for cooperatively reflecting substantially the total of the remainder of said surface wave,said first reflector section being modified according to a predetermined reflectivity function by the absence of predetermined ones of said lineal reflector elements at predetermined locations therein,the number of segments in said segmented reflector elements progressing from a predetermined maximum in the segmented reflector element adjacent said first reflector section to a single segment element most remote from said first reflector section according to said predetermined reflectivity function.
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Abstract
Preferred reflective surface wave processors employ cooperating serially disposed reflector sections. At least one reflecting section comprises an array of non-segmented reflecting grooves in which certain grooves are omitted to form a withdrawal array. Cooperatively coupled to this non-segmented array is an array of segmented grooves. The elements of the segmented array may be made up of progressively fewer segments in regularly spaced lines. The segments in any one segmented line may selectively be of equal lengths randomly spaced within a given line.
26 Citations
14 Claims
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1. Apparatus for reflecting an acoustic surface wave comprising:
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a substrate for supporting a surface acoustic wave at a surface thereof, first and second reflector sections in side-by-side parallel cooperative relation affixed at said surface, said first reflector section including a plurality of lineal reflector elements extending in spaced parallel relation across the path of said acoustic surface wave for reflecting a first portion thereof, said second reflector section including a plurality of segmented reflector elements extending normal to said path, each in parallel relation with said lineal reflector elements, for cooperatively reflecting substantially the total of the remainder of said surface wave, said first reflector section being modified according to a predetermined reflectivity function by the absence of predetermined ones of said lineal reflector elements at predetermined locations therein, the number of segments in said segmented reflector elements progressing from a predetermined maximum in the segmented reflector element adjacent said first reflector section to a single segment element most remote from said first reflector section according to said predetermined reflectivity function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification