Fast time domain physical optics for the analysis of non linear phenomena in large reflector antennas
Résumé
Very large reflector antennas are generally constructed of a large number of metallic tiles that are joined with rivets or other fasteners. The imperfect metalmetal contacts give raise to non linear electromagnetic effects such as passive intermodulation (PIM) that become significant under high power excitation conditions. These phenomena are best analyzed by time domain (TD) methods. For electrically large problems involving smooth geometries, efficient calculation of the radiation patterns or scattering cross sections is often performed via high frequency methods such as the physical optics (PO). In this context, the time domain physical optics (TD PO) appears as the natural tool for the computation of the radiated fields after they have undergone non linear transformations
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