Full-wave domain decomposition method for optimisation of integrated lens antennas

A generalised admittance matrix technique that enables an accurate full-wave analysis of typical integrated lens antennas in less than 2 minutes is presented. The fast analysis is obtained by rigorously combining two efficient higher-order MoM solvers; a general 3D-MoM solver and a fast BoR-MoM solver for structures with rotational symmetry. The method is very suitable for numerical optimisation of dielectric lenses with a 3D feeding arrangement because the full-wave solution can be reassembled in each optimisation step after only a partial re-computation. The results obtained with the domain-decomposition method are compared with simulations and measurements of a leaky lens antenna.