Analysis of end effects in SAW IDTs using the finite difference method

Author

Jatkar, D. ; Beker, Benjamin

Author_Institution

Dept. of Electr. & Comput. Eng., South Carolina Univ., Columbia, SC, USA

fYear

1995

fDate

16-20 May 1995

Firstpage

1371

Abstract

For high-performance SAW filter design the variation of charge distribution along the IDT fingers needs to be evaluated accurately. In this work, the finite difference method was used to study the effects of transverse (along the length of the fingers) and longitudinal (along the propagation direction) variation in charge distribution on the acoustic admittance of the IDT. A comparison was made between a full three-dimensional analysis of SAW IDTs, which includes the effects of bus bars, and the 2-D approximation to the same IDT.<>

Keywords

finite difference methods; interdigital transducers; microwave filters; surface acoustic wave filters; 2D approximation; IDT fingers; SAW IDTs; SAW filter design; acoustic admittance; bus bars; charge distribution; end effects; finite difference method; full three-dimensional analysis; microwave filters; propagation direction; Acoustic transducers; Acoustic waves; Admittance; Fingers; Finite difference methods; Frequency response; Laplace equations; Piezoelectric transducers; SAW filters; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1995., IEEE MTT-S International

Conference_Location

Orlando, FL, USA

ISSN

0149-645X

Print_ISBN

0-7803-2581-8

Type

conf

DOI

10.1109/MWSYM.1995.406226

Filename

406226