Alireza Baghai-Wadji

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In this paper, we propose a hybrid method for the analysis of mechanical features added to the surface of micro-acoustic devices. The proposed technique has been successfully applied to evaluate the influence of additional elastic protective barriers (EPBs) placed on the otherwise planar surface of an 128&#x00B0;YX-LiNbO<inf>3</inf> Surface Acoustic Wave(More)
The Boundary Element Method is a versatile and powerful numerical technique which has been successfully applied to EMC problems in device modelling at various scales and frequency ranges. The underlying system of surface integrals involve (dyadic) Green's functions and their spatial derivatives which are as a rule singular with varying degree of(More)
The application of the Boundary Element Method (BEM) to real-life electromagnetic field problems is generally plagued by numerical difficulties which can be traced back to the singularities of the involved dyadic Green's functions. As a rule, the calculation of the self-actions of the boundary elements (diagonal entries in the impedance matrix), and the(More)
This paper presents an efficient algorithm for modelling the massloading effect in 3D models of micro-acoustic devices, utilizing mesh-less Legendre, Jacobi-Galerking approximations. The efficacy and utility of the proposed method rely on the construction of a set of problem-specific orthogonal basis functions, and the series expansion of non-separable(More)
Brute force three dimensional simulation of Surface Acoustic Wave (SAW) and Bulk Acoustic Wave (BAW) devices with massive metallic electrodes of finite-aperture, massive busbars and massive protective closure structures is a prohibitively difficult task. This paper presents conceptually new ideas and implementation tools based on a mesh-less analysis of the(More)
In this paper we demonstrate a efficient method of deriving the necessary matrices to implement a two-dimensional finite element analysis of multilayered piezoelectric micro-acoustic wave devices. Whereas other commercially available simulation packages are typically based on a modification of a structurally relevant problem, the notations and methods(More)
For the first time the influence of a massive electrode attached to a massive busbar will be presented based on a first-principle stress analysis. To demonstrate the validity of our concept which utilizes problem-specific entire-domain basis- and testing functions, and the associate modified Green's functions in two and three dimensions, we shall present(More)
Computation of electromagnetic scattering by large inhomogeneous 3D targets continues to be a challenging task. The electromagnetic dual-primal finite element tearing and interconnecting (FETI) method has been adopted in this paper. Furthermore, the perfectly matched layer (PML) technique has been utilized to truncate the simulation domain. Numerical(More)
A rigorous semi-numerical method for analyzing quantum wire and quantum dot structures has been developed. The method consists of developing a hierarchy of auxiliary problems which mimic a given (original) problem with increasing similarity and resolution. In each generation of the auxiliary problems the differential operators involved are Hermitian, thus(More)