Stopband characteristics of shallow gratings

Author

Prasad, S. Narasimha ; Schwelb, Otto

Author_Institution

Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada

Volume

37

Issue

2

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

79

Lastpage

84

Abstract

A numerical method of rapidly computing the width of the stopband of a shallow grating in a SAW filter and the dependence of this bandwidth on fabrication parameters is presented. The method is based on the properties of the equivalent circuit of the unit cell at the transition frequencies. Numerical results illustrate the variation of the relative bandwidth with respect to the element reflection coefficient, the mark-to-space ratio, and the velocity perturbation parameter.<>

Keywords

band-stop filters; surface acoustic wave filters; SAW filter; SAW grating filters; element reflection coefficient; equivalent circuit; fabrication parameters; mark-to-space ratio; numerical method; shallow gratings; stopband characteristics; stopband width; transition frequencies; unit cell; velocity perturbation parameter; Bandwidth; Equivalent circuits; Fabry-Perot; Filters; Frequency; Gratings; Passband; Reflection; Surface acoustic waves; Surface waves;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.46972

Filename

46972