Modelling of electrically small antennas using FD-TD and method of moments

Two alternative methods of numerical analysis for electrically small antennas (finite difference time domain and method of moments) have been compared for representative problems. It has been found that both are capable of producing accurate predictions of the far field pattern, although it has been found that in some cases the method of moments predictions are sensitive to the way in which the conducting surfaces are gridded. In terms of numerical efficiency, it has been found that whilst the method of moments may require lesser processing times for electrically small antennas, FD-TD analysis becomes increasingly efficient by comparison as the antenna size increases