A comparison of FD-TD and the method of moments to model electrically small antennas

With the widespread availability of relatively powerful computing resources, accurate numerical modelling of electrically small (<5/spl lambda/) antennas has become a useful and viable option. Two of the more widely used methods are the finite difference time domain (FD-TD) method and the method of moments. This paper compares these two methods, specifically comparing the results obtained from the methods for typical cases, highlighting the aspects of the methods which need to be treated with care to obtain accurate results, and comparing the numerical efficiencies.