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In this paper we present two simulation techniques for modeling periodic structures with three-dimensional elements in general. The first of these is based on the Method of Moments (MoM) and is suitable for thin-wire structures, which could be either PEC or plasmonic, e.g., nanowires at optical wavelengths. The second is a Finite Difference Time Domain (FDTD)-based approach, which is well suited for...
This paper describes a newly developed dipole moment (DM) approach, for modeling periodic structures. It is both memory- and time-efficient, and is applicable to arbitrarily shaped elements, whose material properties can also be arbitrary.
In this paper, the authors describe a new technique for modeling periodic structures that is both memory and time efficient. The method presented is general and for the sake of illustration, frequency selective surface (FSS) elements comprising of wire tripoles was chosen.
Because the EBGs and Metamaterial structures that exhibit interesting characteristics are almost always strictly periodic in nature and because there is an increasing interest in synthesizing new versions of these structures, we need access to both techniques-and computer codes developed on the basis of these techniques-to accomplish our own design goals. Some of the design objectives of Metamaterials...
In this paper, we first discuss the parameter extraction problem associated with a well known DNG element, namely the wire and split ring resonator (SRR) combination. Next, we present the simulation results for the electric field distribution in another DNG structure, namely the mushroom, which is excited by a probe source. Both of these simulations are carried out by using the parallelized FDTD code...
In this paper we present a novel design for a low-profile Fabry-Perot (FP) cavity type antenna, which achieves a high directivity combined with an excellent aperture efficiency. Unlike similar FP cavity-type antennas, that are excited with either a dipole or a microstrip patch antenna (MPA), the proposed approach utilizes a slot feed, which not only is easier to fabricate than the presently available...
Two-dimensional periodic structures, that exhibit spatial filtering characteristics, find a variety of applications in defense as well as communication. Several PBC/FDTD schemes have been proposed for analyzing such structures. By incorporating the PBC, which takes advantage of the periodicity inherent in the geometry as well as the excitation, the simulation of the original problem is reduced to...
In this work, we have investigated the mechanism of performance enhancement of a dipole antenna located above a ground plane, and covered by a dielectric EBG superstrate. We show that the maximum enhancement in the received power can be up to 9.3 dB for the composite. We have gained considerable insight into the mechanism of directivity enhancement that should help us with future designs.
In this paper we determine the weights of the spatial harmonics in a periodic structure, with quasi-periodicity along the propagation direction, by detailed analysis of the fields inside the unit-cells. We use both the Pronypsilas method and Fourier transform to extract the spectrum of the fields inside the unit cells along the propagation direction and compare the results obtained by each method...
In this paper we study the antenna/woodpile electronic bandgap (EBG) composite by using the finite difference time domain (FDTD) Method. The near-field as well as far-field performance are examined at different frequencies with a view to realizing enhanced directivity. In addition, the structure is modeled and simulated under plane wave illumination and the scattered fields are computed to gain an...
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