HIGH-FREQUENCY ANALYSIS OF AN ARRAY OF LINE SOURCES ON A TRUNCATED GROUND PLANE

A uniform high-frequency solution is presented for the field radiated at finite distance by a semi-infinite beam-scanning array of magnetic line sources located on a perfectly conducting half-plane. The field i s represented in terms of Floquet waves plus their relevant singly and doubly diffracted rays, which arise from both the end of the array an d the edge of the half-plane. This representation is uniformly valid a lso when transition conditions from propagating to evanescent Floquet waves occur. Furthermore, it provides a simple and attractive physical interpretation and is found numerically very effective, due to the fa st convergence of the Floquet wave expansion for the field.