Dimension-descent technique with applications to wire antenna problems

In a numerical analysis of an electromagnetic problem, particularly for a wire antenna problem, the method of moments is considered as one of most powerful techniques and therefore has widely been used in analysis and design of various antennas. However, when the electromagnetic objects encountered are large in size with respect to the working wavelength, the computation time consumption and the computer memory requirement might become prohibitive. In this paper, a new numerical technique, termed the dimension-descent technique or DDT for short, is presented which enjoys, in comparison with the method of moments and other related numerical methods, merits of good solution accuracy and high computation efficiency for solving a large size problem. A number of wire antennas are numerically analyzed by means of this method and a favourable coincidence between the calculated results and the results obtained by directly using the method of moments is achieved, which confirms this numerical technique to be correct and effective.