Frequency responses of SAW filters with slanted finger interdigital transducers

Author

Tung, Hsin-Yuan ; Lee, Ru-Yue ; Lee, Hung-Yu ; Ro, Ruyen

Author_Institution

Dept. of Electr. Eng., I-Shou Univ., Kaohsiung, Taiwan

fYear

2004

fDate

18-19 Nov. 2004

Firstpage

750

Lastpage

753

Abstract

The scattering characteristics of SAW filters with slanted finger interdigital transducers (SFITs), which configure many subfilters in parallel connection, are investigated using the transmission matrix method. The overlap width of each subfilter is adjusted to retain passband responses as flat as possible. The gap between input and output SFITs is tuned to reduce the passband ripple. A two-step weighting technique is employed to decrease the sideband level. Simulation results shown that a broadband IF filter can be designed by tailoring SAW SFITs.

Keywords

band-pass filters; electromagnetic wave scattering; frequency response; surface acoustic wave filters; transmission line matrix methods; SAW filters; broadband IF filter; flat passband response; frequency response; passband ripple; scattering characteristics; slanted finger interdigital transducers; transmission matrix method; weighting technique; Band pass filters; Chebyshev approximation; Delay lines; Fingers; Frequency response; Passband; SAW filters; Scattering; Surface acoustic waves; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Intelligent Signal Processing and Communication Systems, 2004. ISPACS 2004. Proceedings of 2004 International Symposium on

Print_ISBN

0-7803-8639-6

Type

conf

DOI

10.1109/ISPACS.2004.1439159

Filename

1439159