Journal ArticleDOI
Different formulations for numerical solution of single or multibodies of revolution with mixed boundary conditions
Ahmed A. Kishk,Lotfollah Shafai +1 more
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In this article, a numerical method for determining the electromagnetic field in the presence of one or several bodies of revolution is presented, where the objects can be made of conductors, dielectrics or their combinations.Abstract:
A numerical method for determining the electromagnetic field in the presence of one or several bodies of revolution is presented. The objects can be made of conductors, dielectrics or their combinations. The excitation is assumed to be due to a plane wave or infinitesimal electric dipoles located within or outside the dielectric. Several formulation types are considered and used to investigate the scattering by different objects. It is found that for moderate values of the dielectric constant, all formulation types give satisfactory results. However, for small or large relative permittivities the solution accuracies depend on the formulation type. As an application of the method to practical problems, two special cases of dielectric rod and microstrip antennas are considered. These antennas have widespread applications and the proposed method can be used to investigate their performance accurately.read more
Citations
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Electromagnetic Modeling of Composite Metallic and Dielectric Structures
TL;DR: In this article, a method of moments (MoM) was proposed for electromagnetic modeling of composite metallic and dielectric structures using entire-domain basis functions defined over bilinear surfaces, resulting in a remarkably small number of unknowns.
Journal ArticleDOI
Low-Profile Wideband Metasurface Antennas Using Characteristic Mode Analysis
Feng Han Lin,Zhi Ning Chen +1 more
TL;DR: In this article, a metasurface (MTS) antenna is proposed for low-profile and wideband operation based on characteristic mode analysis (CMA), where an MTS radiator formed by a diamond-slotted patch is fed by a microstrip line at its bottom through a slot centered on a ground plane.
Book
Frequency selective surfaces : analysis and design
TL;DR: In this paper, the authors draw together the multifaceted work that has been done on frequency selective surfaces and provide a modern overview of the underlying theory and mathematics, and present an overview of some of the most relevant works.
Journal ArticleDOI
Application of combined field Integral equation for electromagnetic scattering by dielectric and composite objects
Pasi Ylä-Oijala,Matti Taskinen +1 more
TL;DR: Combined field integral equation (CFIE) is applied for computing electromagnetic scattering by arbitrarily shaped three dimensional dielectric and composite objects in this paper, where the authors present a CFIE formulation which can be used in the analysis of piecewise dielectrics and composite metallic objects with junctions, and properly choosing the coupling coefficients of the equations the conditioning of the discretized matrix equation can be essentially improved and rapidly converging iterative solutions can be obtained even without preconditioning.
Journal ArticleDOI
Input impedance of dielectric resonator antennas excited by a coaxial probe
TL;DR: In this paper, a formulation based upon the method of moments (MoM) is presented for the computation of input impedance of dielectric resonator antennas, which consists of axially symmetric D resonators fed by thin wire elements.
References
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Journal ArticleDOI
Scattering of electromagnetic waves by arbitrarily shaped dielectric bodies
Peter Barber,C. Yeh +1 more
TL;DR: The differential scattering characteristics of closed three-dimensional dielectric objects are theoretically investigated and the method developed here appears to be most applicable to objects whose physical size is on the order of the wavelength of the incident radiation.
Journal ArticleDOI
Scattering from arbitrarily-shaped lossy dielectric bodies of revolution
Te-Kao Wu,Leonard L. Tsai +1 more
TL;DR: In this paper, a surface integral equation (SIE) technique is developed to analyze the scattering properties of arbitrarily-shaped lossy dielectric bodies of revolution, and the unknown surface currents (both electric and magnetic) are calculated by first, Fourier decomposition, and then, the moment method, Galerkin's procedure.
Journal ArticleDOI
A generalized network formulation for aperture problems
TL;DR: In this paper, a general formulation for aperture problems is given in terms of the method of moments, which applies to any two regions isolated except for coupling through the aperture, and the aperture characteristics are expressed by two aperture admittance matrices, one for each region.
H-field, E-field, and combined-field solutions for conducting bodies of revolution
J. R. Mautz,R. F. Harrington +1 more
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Scattering of a plane electromagnetic wave by axisymmetric raindrops
J. A. Morrison,M.-J. Cross +1 more
TL;DR: In this paper, a nonperturbative solution is obtained by expanding the scattered and transmitted fields in terms of spherical vector wave functions, so that Maxwell's equations are satisfied exactly in the regions exterior and interior to the raindrop, and by combining point matching with least-squares fitting to satisfy the boundary conditions on the surface of the raindropper with sufficient accuracy.