Instructor: Ali R. Baghai-Wadji, Motorola, Inc., Scottsdale, and Department of Mathematics, ASU, Tempe; Arizona
Those phenomena in SAW devices which cannot be described satisfactorily by means of simple models are referred to as second-order effects. Bulk acoustic wave excitation, massloading, surface acoustic wave diffraction, longitudinal and transversal end-effects, electromagnetic cross-talk, electric energy dissipation in resistive electrodes, beam steering, propagation losses along rough surfaces, scattering of surface and bulk acoustic waves at the substrate edges, and phenomena related to the packaging are among the most prominent second-order effects. The objective of this short course is to describe the physics behind these effects in a unifying form, and to familiarize the attendees with basic analytical tools and modern fast-numerical-modeling techniques. To this end, simplest circumstances are discussed first, where some of these effects can be observed in isolation. Next, by gradually increasing the complexity of the IDT structures involved and selecting appropriate substrate material and cuts, these effects are investigated in coexistence. Then, a variety of easy-to-follow examples which are devised to illuminate the hybridization process of analysis techniques are discussed. Finally, combining the boundary element method with finite element and finite difference methods, a rigorous model is proposed which accounts for most of the above-mentioned second order effects in a consistent way. Starting from the basics, and including the latest developments such as the transversal and longitudinal leaky waves, the course manuscript promises to be the most comprehensive text available on the "smart" modeling of the second-order effects in SAW devices.
Ali R. Baghai-Wadji, on leave of absence from Vienna University of Technology, is presently a principal engineering consultant at Motorola, Inc., in Scottsdale, Arizona. He is also affiliated with Arizona State University and is an adjunct professor in the Department of Mathematics. Dr. Baghai-Wadji took his M.Sc. at Vienna University of Technology in 1984, and completed his Ph.D. in communication engineering in 1987, and holds the venia docendi on physical electronics since 1994. He was invited by the Academies of Sciences of Poland and Russia, for a one week stay in each country. Three times he was awarded a Kurt Goedel grant from the Ministry of Science and Education in Austria, which made possible a total of 10 months stay at the University of California, Irvine, during the years 1990, 1991 and 1992. In 1993 he obtained a grant from the Hochschul-jubilaeumsfonds der Stadt Wien, for his contributions in hybridization of numerical techniques. Since 1987 he has conducted eight industrial-sponsored research projects. He has authored or co-authored more than 70 technical papers. Dr. Baghai-Wadji is a member of the Austrian and German Physical Societies, of the German Chaos Group, of the BEM-Society in the United Kingdom, and is a senior-member of IEEE. He has been elected an associated editor for the UFFC-IEEE Transactions.
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