NDLI: Modified Green's function approach to analysis of long SAW transducers

Content Provider	IEEE Xplore Digital Library
Author	Balashov, S.M. Cabreira, C.M. Finardi, C.A.
Copyright Year	1997
Description	Author affiliation: Res. & Dev. Centre, Telecomunicacoes Brasileiras S/A-Telebras, Campinas, Brazil (Balashov, S.M.)
Abstract	Low loss filters based on Single Phase Unidirectional Transducers (SPUDT) could be characterized as a separate class of Surface Acoustic Wave (SAW) filters because they overcome the main SAW filters limitation-6 dB bidirectional insertion loss. For the substrate with the high value of electroacoustic coupling coefficient k/sup 2/ the main effect used to obtain unidirectionality is electrical regeneration which could be treated directly by the Green's Function Model (GFM). The GFM being applicable to an interdigital transducer (IDT) with arbitrary topology is difficult to be applied to the IDT with large number of periods because computation time increases in power law with growth of the IDT length reaching very quickly unacceptable values. In this paper we present the method for calculation of arbitrary SAW filter parameters based on the GFM. Symmetry consideration being used for presentation of the central region of the long IDT, computation time decreases dramatically. At the same time edge effects of the IDT are correctly taken into account. The method developed works both for high and low k/sup 2/ value substrates. Results of calculation of SPUDT characteristics with the help of method proposed are presented.
Starting Page	123
Ending Page	126
File Size	262456
Page Count	4
File Format	PDF
ISBN	0780341538
ISSN	10510117
DOI	10.1109/ULTSYM.1997.662992
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-10-05
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Green's function methods Surface acoustic waves Transducers Strips SAW filters Equations Electrostatics Telecommunications Electronic mail Acoustic waves
Content Type	Text
Resource Type	Article

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