Nonequidistant uniform-beam-profile IDTs in broadband SAW filters

Author

Bausk, Evgeniy V. ; Kolosovsky, Evgeniy A.

Author_Institution

Inst. of Semicond. Phys., Acad. of Sci., Novosibirsk, Russia

Volume

2

fYear

1999

fDate

1999

Firstpage

954

Abstract

An optimization algorithm has been developed for the design of nonequidistant SAW transducers with uniform electrode length. Equidistant transducers weighted by assignment of polarities of individual electrodes are used as initial ones for this procedure. A set of SAW filters with bandwidth of 2-7%, shape factor of 1.2-1.5 has been designed using the suggested algorithm. The improvement of out-of-band rejection for filters with nonequidistant transducers is 3-6 dB in wide stopbands or 5-10 dB in most important narrow frequency regions as compared with equidistant analogs. In addition, the proposed algorithm can synthesize specified nonsymmetric frequency responses

Keywords

frequency response; interdigital transducers; optimisation; surface acoustic wave filters; surface acoustic wave transducers; broadband SAW filters; nonequidistant SAW transducers; nonequidistant uniform-beam-profile IDT; optimization algorithm; out-of-band rejection; specified nonsymmetric frequency responses; uniform electrode length; Acoustic transducers; Algorithm design and analysis; Design optimization; Electrodes; Frequency response; Nonlinear equations; Physics; SAW filters; Shape; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European

Conference_Location

Besancon

ISSN

1075-6787

Print_ISBN

0-7803-5400-1

Type

conf

DOI

10.1109/FREQ.1999.841464

Filename

841464