Doubly apodized SAW filters

Author

Motsoela, T. ; Smith, P.M.

Author_Institution

McMaster Univ., Hamilton, Ont., Canada

Volume

1

fYear

1995

fDate

7-10 Nov 1995

Firstpage

95

Abstract

The design of a surface acoustic wave filter having two apodized in-line transducers is presented. The positions and weights of the taps in both transducers are obtained simultaneously by considering the finger-by-finger interaction between the two transducers. Two design optimization criteria are compared. A device consisting of two 21-tap transducers with a 10 MHz passband centred at 50 MHz is built on 128° rotated Y-cut LiNbO₃ to verify the design. We show that the sidelobe suppression is limited by diffraction, which was not included in the design procedure. The response is compared to that obtained by a singly-apodized SAW filter of comparable length designed with the Remez exchange algorithm

Keywords

frequency response; surface acoustic wave filters; surface acoustic wave transducers; 10 MHz; 128° rotated Y-cut LiNbO₃; 50 MHz; LiNbO₃; Remez exchange algorithm; apodized inline transducers; design optimization criteria; doubly apodized SAW filters; sidelobe suppression; surface acoustic wave filter; Acoustic devices; Acoustic diffraction; Acoustic transducers; Acoustic waves; Design methodology; Fingers; Frequency response; SAW filters; Surface acoustic wave devices; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE

Conference_Location

Seattle, WA

ISSN

1051-0117

Print_ISBN

0-7803-2940-6

Type

conf

DOI

10.1109/ULTSYM.1995.495548

Filename

495548