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

Volume

138

Issue

2

fYear

1991

fDate

4/1/1991 12:00:00 AM

Firstpage

151

Lastpage

158

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;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings H

Publisher

iet

ISSN

0950-107X

Type

jour

Filename

68348