Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

1977-01-05

1978-08-29

Willis, Davis L.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

310313, 333 30R, H03H 926, H03H 904, H03H 930, H03H 932

Patent

active

041107144

ABSTRACT:
A surface acoustic wave device wherein a reflective array is disposed on a surface of material capable of supporting propagating surface acoustic wave energy, the array including a plurality of spaced, parallel elements having longitudinal axes angularly oriented with respect to the direction of a beam path of propagating straight crested phase fronts, the device also including matching structures disposed adjacent the leading and trailing ends of the elements for converting the normal mode, straight crested phase front outside the reflective array region to the normal mode, sawtoothed shaped, phase front within the reflective array region, and the reverse thereof, and thereby avoid diffractive effects at the entry and exit points of the reflective array.

REFERENCES:
patent: 3883831 (1975-05-01), Williamson et al.
patent: 4048594 (1977-09-01), Weglein

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