The paper is aimed to the multi-objective optimization of wire multi-band antennas. Antennas are numerically modeled using time-domain integral-equation method. That way, the designed antennas can be characterized in a wide band of frequencies within a single run of the analysis. Antennas are optimized to reach the prescribed matching, to exhibit the omni-directional constant gain and to have t...

in this paper, some applications of the method of least squares (mls) for the solution of various problems in electromagnetics engineering is briefly reviewed. here, mls is employed for the solution of various problems such as solution of equations, curve fitting to measured data, generalized fourier coefficients, linear operator equations, inegro-differential equations, electrostatics and magn...

This paper first examines and corrects Storer’s theory of circular loop antennas, then investigates theoretically the proposed Ω-shaped loop-dipole antenna. Special emphasis is given to analysis effect higher-order terms Fourier series as a remainder on current distribution, input impedance, radiation patterns thin-wire It found that must be included in calculation distribution impedance but ca...

The fundamental mechanism behind directive beaming at broadside for various structures will be explored. These include Fabry-Pérot type of resonant-cavity antennas, low-permittivity metamaterial substrate antennas composed of a wire medium slab, and optical directive beaming due to plasmonic effects. In all cases it will be shown that the fundamental explanation for the directive beaming effect...

Abstract— The radiation characteristics of two kinds of antennas made of transparent conductive films are investigated: a planar inverted-F antenna (PIFA) and a monopole antenna. These antennas are designed to work at 2.4 GHz and their performances are compared with each other for several films with different sheet resistivities. Wire-grid models based on the moment method are applied for the n...

This paper reports on a design technique for broadband high frequency wire antennas. The antennas are loaded with RLC circuit elements to achieve broad impedance bandwidth (for a desired VSWR) and possible high gain, through modifying the current distribution. These loads can be parallel RLC circuits optimized via Genetic Algorithm (GA) for maximum bandwidth. The GA iterative1y guides a populat...