A COM analysis of SAW waveguide-coupled resonator filters

Author

Xu, Yan ; Smith, P.M.

Author_Institution

Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont.

fYear

1993

fDate

31 Oct-3 Nov 1993

Firstpage

31

Abstract

A new method of analyzing surface acoustic wave waveguide-coupled (WGC) resonator filters using the coupling-of-modes (COM) technique is presented. General COM equations for the coupled transducers and coupled reflectors are derived. The mechanism of coupling is described by using the coupling of waves in the opposite directions within one track and the coupling of waves in the same direction between two adjacent tracks. The reflection, transduction, attenuation and coupling between two tracks are included in the model. Closed form solutions for the case of uniform coupled transducers and coupled gratings are obtained. A model based on the above analysis is developed for two-pole WGC resonator filters, and Y-parameters are obtained from this model. Computed results are shown to agree with experimental work

Keywords

acoustic resonators; piezoelectric transducers; surface acoustic wave filters; ultrasonic transducers; SAW waveguide-coupled resonator filters; Y-parameters; attenuation; coupled gratings; coupled transducers; coupling-of-modes; reflection; surface acoustic wave waveguide-coupled resonator filters; transduction; two-pole; Acoustic transducers; Acoustic waveguides; Acoustic waves; Attenuation; Closed-form solution; Equations; Gratings; Reflection; Resonator filters; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1993. Proceedings., IEEE 1993

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1993.339707

Filename

339707