Radiation pattern simulation of antenna array problem with perfectly electrically conducting object in arbitrary shape using novel hybrid method of equivalence principle algorithm and physical optics

A hybrid method combining the equivalence principle algorithm (EPA) with physical optics (PO) is proposed to solve electromagnetic radiation of an antenna array with perfectly electrically conducting (PEC) object of arbitrary shape. The main idea of this approach is based on the domain decomposition method which is a scheme for multi-scale problems. An EPA can simulate antenna array accurately, and PO is an asymptotical method to obtain current distribution on a PEC object of arbitrary shape as an electrically large problem. For an antenna array with identical elements, the equivalence principle operator only needs to be calculated and be stored once. Compared with the original EPA, this approach performs with higher efficiency and fewer iterations with acceptable accuracy. Numerical results demonstrate the feasibility of the hybrid method.