Parallel Implementation of a Combined Moment Expansion and Spherical-Multipole Time-Domain Near-Field to Far-Field Transformation

A time-domain spherical-multipole near-to-far-field algorithm running in a parallelized code version is introduced in this paper. Such an approach is employed to obtain UWB antenna radiated fields and radiation patterns directly in time domain, which is more convenient to perform a unified characterization in time and frequency domains. We propose the use of the OpenMP, an application program interface that permits the code parallelization with almost no intervention. The results show that the proposed technique allows a code running 28 times faster when using a computer with 24 processors, each one with two threads, when compared with the sequential one. It also suggested a moment expansion technique to improve the accuracy and computational efficiency when using Gaussian pulse excitation when compared with the Fourier transform.