Efficient simulation of EMI induced in the platform-mounted antennas using a hybrid moment method-physical optics method

In this paper, the wire antenna mounted on an electrically large platform is analyzed. The antenna and its nearby region are modeled using moment method, while other regions are modeled using physical optics. The number of unknowns and computing time are greatly reduced compared with the original moment method. At the same time, we propose a simple model of current expansion for the junction of more than two triangles, which provides accurate and robust results both in moment method and physical optics solutions. Several numerical examples are presented to show the accuracy and efficiency of this hybrid method and the proposed current model.