Thomas E Szabo

US Patent:

41468082, Mar 27, 1979

Filed:

Nov 10, 1977

Appl. No.:

5/850325

Inventors:

Kenneth R. Laker - Staten Island NY
Thomas L. Szabo - Boston MA
Andrew J. Slobodnik - Malden MA

Assignee:

The United States of America as represented by the Secretary of the Air
Force - Washington DC

International Classification:

H01L 4110

US Classification:

310313

Abstract:

Passband distortion due to mass loading in withdrawal weighted surface acoustic wave transducers is substantially reduced by a thinning technique in which interdigital transducer electrodes are selectively withdrawn to synthesize a response function H. sub. o '(N). H. sub. o '(N) is a modified response function that has been scaled from a desired response function H. sub. o (N) by a thinning factor THIN. THIN is a positive, non-zero constant with a maximum value of unity. Thinned withdrawal weighted transducers fabricated in accordance with the technique have electrode weights that are normalized to less than unity and achieve mass loading reduction with a minimum amount of degradation of the desired response function.