Analysis Of Thin-wire Antennas Research Articles

Numerical integration method in analysis of wire antennas

The numerical evaluation of an integral is a frequently encountered problem in antenna analysis. A special Gauss-Christoffel quadrature formula for nonclassical weight function is constructed for solving the pseudo-singular integration problem arising from the analysis of thin-wire antennas. High integration accuracy is obtained at comparable low computation cost by the quadrature formula constructed. This integration method can be also used in other electromagnetic integral equation problems.

Application of wavelets on the interval to the analysis of thin-wire antennas and scatterers

An analysis of thin-wire antennas and scatterers using orthogonal wavelets on interval [0,1] is presented. The thin-wire version of the electric-field integral equation (EFLE) is solved by the hybrid wavelet expansion and boundary element method (HWBM). Maps between the curved solution domains and the interval [0,1] are established by using the geometrical representation of the boundary element method (BEM). By virtue of these maps, bases over the curved solution domains are derived from orthogonal wavelets on [0,1] that are used to expand the unknown current over the wires. The utilization of the wavelets on [0,1] circumvents the difficulties in the application of the wavelets on the real line to finite-domain problems and has no periodicity constraint to the unknown function that is usually imposed by the periodic wavelets. Numerical examples are provided for a variety of thin-wire antennas and scatterers.

Entire-domain analysis of thin-wire antennas in layered media

An entire-domain method is proposed for the analysis of thin-wire antennas assembled from arbitrarily interconnected straight segments situated in imperfectly conducting layered media. Following the Sommerfeld formulation, novel recursive formulas for the Hertzian vector components for vertical and horizontal Hertzian dipole located in any layer are obtained. Such exact Sommerfeld solutions are incorporated into the Hallen integral equations which are numerically solved by polynomial approximation of current and point matching. The Sommerfeld integral terms are evaluated numerically with high accuracy.

Entire-domain analysis of thin-wire antennas near or in lossy ground

An entire-domain method is proposed for the analysis of thin-wire antennas assembled from arbitrarily interconnected straight segments placed on one or both sides of the interface air/lossy ground. The approach is based on an exact Sommerfeld-type formulation combined with the Hallen-type integral equations for current distribution, polynomial approximation of current and point matching. Limitations on the antenna position with respect to the interface and on the value of the ground parameters seem to be less than in other available methods, and accuracy of the results depends principally on available CPU time.