SAW filters including one-focus slanted finger interdigital transducers

Author

Martin, G. ; Steiner, B.

Author_Institution

Inst. for Solid State & Mater. Res. Dresden, Germany

Volume

1

fYear

2001

fDate

2001

Firstpage

45

Abstract

The present paper describes a new SFIT-filter type (SFIT: Slanted Finger Interdigital Transducer) that allows fast analysis as a precondition for fast optimization. Therefore, filter structure and analysis are especially suitable for optimizing Unidirectional SFIT (USFIT) filters. For analysis, a SFIT filter is usually divided into many narrow channels. Every channel is considered to be a subfilter and is analyzed separately. Therefore, the total filter analysis is very time consuming. For reducing computing time, we suggest a one-focus structure. As a result, the parameters of all subfilters can be calculated from the parameters of only one subfilter by simple frequency scaling. However, one-focus SFIT filters with continuous finger edges show a deep minimum within the passband. This problem can be overcome by using stepped one-focus structures

Keywords

acoustic focusing; interdigital transducers; surface acoustic wave filters; surface acoustic wave transducers; SAW filter; design optimization; frequency scaling; slanted finger interdigital transducer; stepped one-focus structure; unidirectional SFIT filter; Band pass filters; Electrodes; Fingers; Frequency; Passband; Reflection; SAW filters; Solid state circuits; Transducers; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2001 IEEE

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-7177-1

Type

conf

DOI

10.1109/ULTSYM.2001.991575

Filename

991575