Diffraction in slanted finger SAW filters

Author

Yatsuda, Hiromi

Author_Institution

Japan Radio Co. Ltd., Saitama, Japan

Volume

1

fYear

2000

fDate

36800

Firstpage

173

Abstract

The purpose of this paper is to describe diffraction effects on slanted finger interdigital transducers (SFITs). In order to analyze the diffraction effects, two methods to calculate SAW amplitude profiles radiated from an SFIT are presented. One is to calculate the electric power of the acoustic ports in the Smith´s equivalent circuit for the sub-filters with different center frequencies, which were obtained by dividing SFITs into some channels. The other is to calculate the SAW intensity at an observation point using an angular spectrum method. The frequency responses of the SFIT filter with a center frequency of 40 MHz and a bandwidth of 6 MHz are calculated using the angular spectrum method. Good agreements between theoretical and experimental results are obtained

Keywords

acoustic wave diffraction; equivalent circuits; frequency response; interdigital transducers; radiofrequency filters; surface acoustic wave filters; 40 MHz; 6 MHz; SAW amplitude profiles; SAW intensity; Smith equivalent circuit; angular spectrum method; diffraction effects; electric power calculation; frequency responses; slanted finger IDT; slanted finger SAW filters; slanted finger interdigital transducers; sub-filters; Band pass filters; Bandwidth; Diffraction; Equivalent circuits; Fingers; Frequency conversion; Frequency measurement; SAW filters; Surface acoustic waves; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2000 IEEE

Conference_Location

San Juan

ISSN

1051-0117

Print_ISBN

0-7803-6365-5

Type

conf

DOI

10.1109/ULTSYM.2000.922533

Filename

922533