The reciprocity theorem applied to finding the best coupling incidence

This document presents an application of the electromagnetism reciprocity theorem in the time domain. The far field radiated by a system in a given direction is used to evaluate the effect of an incident plane wave coming from that direction. The useful formulas are derived for a current source and a voltage source. These results are applied with the FDTD software Gorf3D. A single run with a system radiating in N directions enables to predict the result of N runs with a system illuminated by a plane wave. Application examples are used to estimate the computation time gain. To cite this article: J.-P. Adam et al., C. R. Physique 10 (2009).