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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)
—In this article, we demonstrate that in the case of a positive group velocity left-handed nonlinear (LH-NL) transmission line with series nonlinear capacitances, the spatial derivative of the voltage distribution satisfies the nonlinear Schrödinger (NLS) equation. Consequently, it will shown that a LH-NL transmission line with series varactors can be used(More)
A spiral antenna operating at 24 GHz designed for scientific and medical (ISM) band is reported. The procedure is fully compatible with standard CMOS fabrication process. The fabrication has been achieved on silicon substrates using a bulk micromachining technique. To improve the radiation efficiency and to minimize transmission loss, a silicon-based(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)
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)
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