Title :
Stopband characteristics of shallow gratings
Author :
Prasad, S. Narasimha ; Schwelb, Otto
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, Que., Canada
fDate :
3/1/1990 12:00:00 AM
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;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
