Laser-aided amplitude compensation for SAW RAC devices

Author

Thoss, J.L.

Author_Institution

Hughes Aircraft Co., Fullerton, CA, USA

fYear

1990

fDate

4-7 Dec 1990

Firstpage

185

Abstract

A post-fabrication trimming method using direct laser writing has proven to be effective in reducing phase errors in RAC (reflective array correlator) lines. This method has been applied to the compensation of amplitude errors. Amplitude trimming requires a lossy film to alter the amplitude response. Using a simple correction algorithm to pattern chrome cermet films, various amplitude corrections have been written by laser. Amplitude errors as large as 7 dB have been trimmed and errors have been reduced to a few tenths of a decibel. The use of laser amplitude and phase compensation has repeatedly produced devices with time sidelobe suppressions of 40 dB or greater

Keywords

acoustic signal processing; correlators; error compensation; laser beam applications; surface acoustic wave filters; Cr-Cr₂O₃ cermet; Cr₂O₃; SAW reflective array correlator devices; amplitude response; chrome cermet films; compensation of amplitude errors; correction algorithm; direct laser writing; laser-aided amplitude compensation; lossy film; post-fabrication trimming method; time sidelobe suppressions; Ceramics; Conductive films; Costs; Optical films; Optical materials; Phased arrays; Production; Sputtering; Surface acoustic waves; Writing;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1990. Proceedings., IEEE 1990

Conference_Location

Honolulu, HI

Type

conf

DOI

10.1109/ULTSYM.1990.171349

Filename

171349