Radiation conductance and grating reflectivity weighting parameters for dual mode leaky-SAW resonator filter design

Author

Edmonson, P.J. ; Campbell, C.K.

Volume

1

fYear

1994

fDate

Oct. 31 1994-Nov. 3 1994

Firstpage

75

Abstract

Antenna theory is applied to model the radiation conductance of thick-film interdigital transducers (IDTs) in dual mode wideband leaky-SAW resonator-filters on 64° Y-X LiNbO₃ employing a three-IDT structure. As well, SAW coupling-of-modes reflection-grating equations and IDT S-parameters are modified to cater for increased leaky-SAW attenuation above the Bragg frequency. Theoretical frequency response computations are in excellent agreement with experimental results obtained for several 85-MHz structures fabricated with metallization film thickness ratios (h/λ) of up to 3%

Keywords

frequency response; interdigital transducers; surface acoustic wave resonator filters; 85 MHz; Bragg frequency; LiNbO₃; antenna theory; coupling-of-modes reflection-grating equations; dual-mode filters; frequency response computations; grating reflectivity weighting parameters; leaky-SAW attenuation; leaky-SAW resonator filter design; metallization film thickness ratios; radiation conductance; thick-film interdigital transducers; three-IDT structure; Interdigital transducers; Leaky waves; Surface acoustic wave resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE

Conference_Location

Cannes, France

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1994.401555

Filename

401555