Title :
Iterative calculation of ship-borne HF antenna performance
Author :
Baldwin, P J ; Boswell, A.G.P. ; Brewster, D.C. ; Allwright, J.S.
Author_Institution :
Admiralty Res. Establ., Portsmouth, UK
fDate :
4/1/1991 12:00:00 AM
Abstract :
The computer program NEC-2, which calculates the currents on wire-grid models by the method of moments, is modified to analyse structures which consist of a collection of disconnected substructures. The matrix equation for the currents is solved by means of iteration between the substructures using the Siedel method. The convergence is accelerated using an extrapolation technique. The program is used to calculate the impedance and radiation patterns of ship-borne antennas in the presence of a funnel, masts and other antennas, all on a perfectly conducting ground plane. Comparisons of the results obtained using the two codes show good agreement. In addition, a programme of electromagnetic measurements was carried out to validate the use of wire-grid computer codes in the simulation of antenna characteristics and scattering phenomena in the HF band. The results show favourable agreement.
Keywords :
antenna radiation patterns; convergence of numerical methods; electric impedance; iterative methods; mobile antennas; telecommunications computing; 3 to 30 MHz; NEC-2; Siedel method; computer program; convergence; disconnected substructures; electromagnetic measurements; extrapolation technique; impedance; iteration; matrix equation; method of moments; perfectly conducting ground plane; radiation patterns; scattering phenomena; ship-borne HF antenna performance; wire-grid models;
Journal_Title :
Microwaves, Antennas and Propagation, IEE Proceedings H
