Enhancing the efficiency of MLFMA-PO hybrid method for analyzing electrically large objects

A hybrid technique combining the multi-level fast multipole algorithm (MLFMA) and the physical optics (PO) is presented for analyzing scattering and radiation by electrically large structures. Based on the previously proposed hybrid technique, an extra oct-tree structure is built for the MoM region to accelerate the solving process. What is more, an iteration scheme is proposed to further enhance the efficiency compared to the conventional hybrid method. Numerical results are given to demonstrate the reasonable accuracy and high capability of the proposed hybrid technique compared to the conventional MLFMA and MLFMA-PO method.