Iterative method using constrained optimization techniques for second-order effects compensation in SAW filters

Author

Naglowski, P.J.

Author_Institution

Inst. for Electron. Mater. Technol., Warsaw, Poland

fYear

1989

fDate

3-6 Oct 1989

Firstpage

125

Abstract

A novel algorithm for broadband compensation of second-order effects in SAW (surface acoustic wave) filters consisting of one apodized and one unapodized interdigital transducer (IDT) is presented. The method ensures effective compensation of second-order effects even at frequencies close to or equal to zeros of unapodized IDT response. In contrast to earlier methods, inequality constraints are imposed on positions of gaps in apodized IDT. Owing to this feature, this fixed aperture of the IDT can be easily maintained throughout the compensation process. Compensation results are given for a 14 λ aperture SAW TV-IF filter

Keywords

iterative methods; optimisation; surface acoustic wave filters; ultrasonic devices; SAW TV-IF filter; SAW filters; apodized; broadband compensation; constrained optimization techniques; interdigital transducer; iterative method; second-order effects; unapodized; Admittance; Algorithm design and analysis; Apertures; Constraint optimization; Electrodes; Frequency response; Iterative methods; Materials science and technology; SAW filters; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1989. Proceedings., IEEE 1989

Conference_Location

Montreal, Que.

Type

conf

DOI

10.1109/ULTSYM.1989.66971

Filename

66971