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In this paper we propose a ray-tracing method for modeling the correlation of the received signals by two or more antennas operating in a multipath environment. Assuming that the maximum excess delay in the channel is known, we create an elliptical region surrounding both the transmitter and receiver antennas. A number of scatterers are randomly distributed(More)
Swarm Optimization (PSO) is a powerful evolutionary computation technique for solving continuous-valued optimization problems in various fields of engineering. However, its binary version could not attract much attention such that research on the discrete form of the PSO is currently not massive. In this paper, the Boolean PSO is introduced based on the(More)
—A novel dual-frequency dual-linear-polarization printed antenna element benefiting from a single-feed single-layer structure is introduced in this paper. The Boolean particle swarm optimization algorithm in conjunction with the method of moments (MoM) is employed to optimize the geometry of the antenna after considering three objectives: cross(More)
—In this paper, the power dissipated through different loss mechanisms including dielectric, conductor and radiation loss is calculated for the substrate integrated waveguide (SIW) and modified substrate integrated waveguide (MSIW). The applied computational method being appropriate for structures with periodic conducting parts allows one to calculate the(More)
A compact planar wideband microstrip antenna is introduced. The antenna is a log-periodic antenna with 7 dipole elements. The antenna is designed to function in the frequency range of 500 to 700 MHz. It has a dimension of 268 mm by 145 mm by 3 mm. The matching is better than -10 dB in the working bandwidth. The proposed antenna generates linear(More)
Large absolute higher-order stop-bands are realized in two-dimensional photonic crystals of a square lattice with ring-shaped features using a real-valued genetic algorithm. The idea of the photonic crystals with ring-shaped features comes from the phenomenon of formation of the Arago spot in the middle of circular patterns in the process of optical(More)
A new set of basis functions is presented for the analysis of frequency selective surfaces (FSSs) by the method of moments (MoM). Each of the separate patches in the unit cell of an FSS is covered with some large overlapping sub-patches. Each sub-patch has a shape that is simple enough for obtaining an appropriate set of basis functions analytically from an(More)
Shank's transformation is employed for the improvement of the convergence of the Fourier modal analysis of photonic crystals. In this paper, we have studied the plane-wave diffraction of a one-dimensional dielectric photonic crystal slab. Numerical results demonstrate a substantial improvement in the convergence rate of the diffraction efficiency so that a(More)
A plane-wave expansion method is used to analyze the interaction of nonuniform electromagnetic waves with a metamaterial slab. A network of transmission lines models the propagation of the constituting plane-wave components of the incident and diffracted beams. Having determined the complex amplitude of these components, one can obtain the total solution(More)