Browsing by Author "Dural, G."
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Item Open Access Closed-form Green's functions for general sources and stratified media(Institute of Electrical and Electronics Engineers, 1995-07) Dural, G.; Aksun, M. I.The closed-form Green's functions of the vector and scalar potentials in the spatial domain are presented for the sources of horizontal electric, magnetic, and vertical electric, magnetic dipoles embedded in general, multilayer, planar media. First, the spectral domain Green's functions in an arbitrary layer are derived analytically from the Green's functions in the source layer by using a recursive algorithm. Then, the spatial domain Green's functions are obtained by adding the contributions of the direct terms, surface waves, and complex images approximated by the Generalized Pencil of Functions Method (GPOF). In the derivations, the main emphasis is to put these closed-form representations in a suitable form for the solution of the mixed potential integral equation (MPIE) by the method of moments in a general three-dimensional geometry. The contributions of this paper are: 1) providing the complete set of closed-form Green's functions in spectral and spatial domains for general stratified media; 2) using the GPOF method, which is more robust and less noise sensitive, in the derivation of the closed-form spatial domain Green's functions; and 3) casting the closed-form Green's functions in a form to provide efficient applications of the method of moments.Item Open Access Closed-form green's functions of HED, HMD, VED, and VMD for multilayer media(IEEE, 1993-06-07) Aksun, M. İrşadi; Dural, G.The closed-form Green's functions of the vector and scalar potentials in the spatial domain are presented for the sources of horizontal electric, magnetic, and vertical electric, magnetic dipoles embedded in a general, multilayer, planar medium. The spectral domain Green's functions in a arbitrary layer are obtained through the Green's function of the source layer by using a recursive algorithm.Item Open Access Comparative evaluation of absorbing boundary conditions using Green's functions for layered media(IEEE, 1995) Aksun, M. İrşadi; Dural, G.Absorbing boundary conditions are comparatively studied using the Green's functions of the vector and scalar potentials for multilayer geometries and general sources. The absorbing boundaries are introduced as additional layers with predefined reflection coefficients into the calculation of the Green's functions. The Green's functions are calculated using different reflection coefficients corresponding to different absorbing boundaries and compared to those obtained with no absorbing boundary. This approach provides an absolute measure of the effectiveness of different absorbing boundaries.Item Open Access Comparative evaluation of absorbing boundary conditions using Green's functions for layered media(Institute of Electrical and Electronics Engineers, 1996-02) Aksun, M. İrşadi; Dural, G.Absorbing boundary conditions are comparatively studied using the Green's functions of the vector and scalar potentials for multilayer geometries and general sources. Since the absorbing boundaries are introduced as additional layers with predefined reflection coefficients into the calculation of the Green's functions, this approach provides an absolute measure of the effectiveness of different absorbing boundaries. The Green's functions are calculated using different reflection coefficients corresponding to different absorbing boundaries and compared to those obtained with no absorbing boundary. It is observed that the perfectly matched layer (PML) is by far the best among the other absorbing boundary conditions whose reflection coefficients are available.Item Open Access A numerically efficient technique for the analysis of slots in multilayer media(Institute of Electrical and Electronics Engineers, 1998-04) Kınayman, N.; Dural, G.; Aksun, M. I.A numerically efficient technique for the analysis of slot geometries in multilayer media is presented using closed-form Green's functions in spatial domain in conjunction with the method of moments (MoM). The slot is represented by an equivalent magnetic-current distribution, which is then used to determine the total power crossing through the slot and the input impedance. In order to calculate power and current distribution, spatial-domain closed-form Green's functions are expanded as power series of the radial distance />, which makes the analytical evaluation of the spatial-domain integrals possible, saving a considerable amount of computation time.