Closed-form Green's functions for finite grounded dielectric substrate

Öğücü, Gölge
Aydın Çivi, Hatice Özlem
The approximate closed-form Green's functions of the vector and scalar potentials in the spatial domain are derived for a horizontal electric dipole placed over a finite grounded dielectric medium. The effects of the discontinuity at the edges are considered by including the surface wave reflections from the edges, which are obtained as a function of the incident angle by using the edge admittance concept. The closed-form expressions of the reflection coefficients are then derived by means of the generalized pencil of functions method. The resulting Green's functions are the sum of the contributions of discrete complex images, the incident, and the reflected surface wave contributions.


Form-Invariance of Maxwell's Equations in Waveguide Cross-Section Transformations
Ozgun, Ozlem; Kuzuoğlu, Mustafa (Informa UK Limited, 2009-01-01)
We present a novel coordinate transformation technique that controls the propagation of waves inside a waveguide, such that the waveguide behaves as if it is a reshaped waveguide. In this technique, the spatial domain of the waveguide is mapped to that of its reshaped equivalent, yielding an anisotropic medium inside the waveguide. In other words, the waveguide in the transformed space can be imagined as if it is filled with an anisotropic metamaterial whose spatially varying constitutive parameters reflect...
General-Purpose Characteristic Basis Finite Element Method for Multi-Scale Electrostatic and Electromagnetic Problems
Ozgun, Ozlem; Mittra, Raj; Kuzuoğlu, Mustafa (Informa UK Limited, 2010-01-01)
This article presents a noniterative and parallel finite element technique that is tailored for a wide class of electromagnetic boundary problems, covering both quasi-static and time-harmonic regimes. This approach, called the characteristic basis finite element method, combines the domain decomposition technique with the use of characteristic basis functions that are generated by employing a finite number of point charges or dipole-type sources, depending upon whether work is being done in a quasi-static o...
Spherical wave expansion of the time-domain free-space Dyadic Green's function
Azizoglu, SA; Koç, Seyit Sencer; Buyukdura, OM (Institute of Electrical and Electronics Engineers (IEEE), 2004-03-01)
The importance of expanding Green's functions, particularly free-space Green's functions in terms of orthogonal wave functions is practically self-evident when frequency domain scattering problems are of interest. With the relatively recent and widespread interest in time-domain scattering problems, similar expansions of Green's functions are expected to be useful in the time-domain. In this paper, an expression, expanded in terms of orthogonal spherical vector wave functions, for the time-domain free-space...
Design optimization of a laser path length controller through numerical analysis and experimental validation
Fenercioglu, Tevfik Ozan; Yalçınkaya, Tuncay (IOS Press, 2019-01-01)
As an integral part of Strapdown Inertial Navigation Systems, ring laser gyroscopes (RLG) are exposed to joint loading conditions where thermal, static and dynamic loads occur simultaneously. The effects of different loading conditions on overall RLG performance should be addressed in parallel for an optimum design. A crucial aspect in this process is the development of the path length controller (PLC), consisting of a mirror, a composite piezo electric bending actuator and other motion transfer elements. T...
Phonon dispersions and elastic constants of disordered Pd-Ni alloys
Kart, SO; Tomak, Mehmet; Cagin, T (Elsevier BV, 2005-01-31)
Phonon frequencies of Pd-Ni alloys are calculated by molecular dynamics (MD) simulation. Lattice dynamical properties computed from Sutton-Chen (SC) and quantum Sutton-Chen (Q-SC) potentials as a function of temperature are compared with each other. We present all interatomic force constants up to the 8th nearest-neighbor shell obtained by using the calculated potential. Elastic constants evaluated by two methods are consistent with each other. The transferability of the potential is also tested. The result...
Citation Formats
G. Öğücü, L. ALATAN, and H. Ö. Aydın Çivi, “Closed-form Green’s functions for finite grounded dielectric substrate,” ELECTROMAGNETICS, pp. 153–168, 2005, Accessed: 00, 2020. [Online]. Available: