1,721,020 research outputs found
Radiation and Scattering of an Arbitrarily Flanged Dielectric-Loaded Waveguide
Full text linkIn this article, we present a new methodology in spectral domain to study a novel, complex canonical electromagnetic problem constituted of perfectly electrically conducting (PEC) wedges immersed in complex environments. In particular, we present an arbitrarily flanged dielectric-loaded waveguide that resembles practical structures in scattering analysis, radar applications, antenna's design, and electromagnetic compatibility. The proposed method is based on the recently developed semianalytical method known as the generalized Wiener-Hopf technique that extends the applicability of classical Wiener-Hopf method to a new variety of problems constituted of different geometries and materials. In this article, the method is further extended and it is now capable of handling piecewise constant inhomogeneous dielectric layers by resorting to the application of characteristic Green's function procedure starting from the wave equation. The method has the benefit to be a comprehensive mathematical model and to be quasi-analytical, thus allowing us to investigate the true physics of the problem in terms of field's components. The proposed solution is also of interest in computational electromagnetics to benchmark numerical codes. Validation through numerical results is reported in terms of engineering quantities such as geometrical theory of diffraction (GTD)/uniform theory of diffraction (UTD) coefficients, total far fields, and modal fields
Optimization of electric vehicles charging station deployment by means of evolutionary algorithms
Full text linkDue to the growing importance of electric vehicles, charging stations (CS) deployment is becoming an important issue in many cities. The aim of this paper is to introduce a novel evolutionary-based approach for solving the CS deployment problem. This study investigates many aspects of the formulation of this approach, such as the design variables selection and the definition of a feasibility function, to improve both effectiveness and flexibility. In particular, the latter is a key factor compared to many other state-of-the-art approaches: in fact, it can be used with most of the available Evolutionary Algorithms (EAs) and can manage different quality-of-service performance parameters. The proposed approach is successfully compared with a greedy optimization on the case study of the City of Milan (Italy) using four different EAs. Two different performance parameters have been defined and used to prove the flexibility of the proposed approach. The results show its very good convergence rate and the quality of the obtained solutions
Wiener-hopf formulation of the scattering by a PEC wedge over an half dielectric grounded slab
Full text linkThis paper presents the formulation of electromagnetic problems constituted of inhomogeneous coupled angular and planar regions by using the Generalized Wiener-Hopf Technique (GWHT). In particular the paper is focused on the scattering of a perfectly electrically conducting (PEC) wedge in contact with an half dielectric grounded slab. The solution method is based on deriving the Wiener-Hopf formulation and on using the Fredholm factorization. In this case the presence of inhomogeneous regions introduces further difficulties
Diffraction by a truncated slab filled by dielectric material
No full textThis paper concerns the diffraction of a plane wave by a semi-infinite dielectric slab. A semi analytical solution is derived using the Wiener-Hopf technique through the Fredholm factorization. With this work we present a general methodology capable to deal with angular regions and planar regions filled with arbitrary material
Multiple wedges diffraction in propagation problems using the generalized wiener-hopf technique
Full text linkIn this work, in order to accurately predict diffraction phenomena in propagation problems, we introduce the analysis of the scattering of multiple wedges using the semianalytical method known as Generalized Wiener-Hopf Technique. The analysis is of interest to correctly model path-loss in real-life scenarios for wireless communications
Quasi-analytical wiener-hopf solutions of electromagnetic problems to benchmark full numerical computational electromagnetics programs
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