Ray tracing fields backscattered from curved dichroic structures

Compared with computing the forward radiation patterns, modelling fields backscattered from a curved dichroic surface enclosing an antenna using ray tracing, introduces further levels of path complexity between source and field points. A paraboloidal radome, with an FSS array symmetrically embedded in the dielectric wall, is used as an illustration of the influence that the relative source/field point locations have on the path multiplicity and on the sequence of high order backscattered ray paths. Results are presented for a ring slot FSS enclosing a waveguide horn, including field distributions and power backscattered into the antenna