On the Calculation of Time-Domain Response of Antennas Mounted on Large Platforms

We present an efficient and accurate approach for calculating time-domain responses of antennas mounted on electrically large platforms, such as airplanes, spacecrafts, ships, tanks, etc. The approach is based on the proficient frequency-domain analysis coupled with the inverse Fourier transform, in order to obtain time-domain responses. For the basic frequency-domain analysis we use method of moments (MoM) with higher-order basis functions and Galerkin testing procedure [3], incorporated in the WIPL-D Pro software package. If the analyzed antenna is mounted on the large platform the rigorous MoM analysis needs a lot of computer resources. However, the number of unknown coefficients for the approximation of the current distribution, needed in the frequency analysis, can be drastically reduced without loosing the accuracy significantly [4]. We utilize that fact for the calculation of time-domain responses.