Analysis and design of complex structures with an Eigencurrent Expansion Method

A new Eigencurrent Expansion Method is developed, called Structure Eigencurrent Expansion Method (SEEM), using a reduction scheme on a Method-of-Moment (MoM) matrix in order to solve the Electric-Field Integral Equation (EFIE) in less computational time. This reduction is based on a subdivision of the coupled and uncoupled currents, reducing the amount of radiating currents that needs to be taken into account. This reduces the number of elements in the system MoM matrix. Additionally, symmetry and repetition occurring in complex structures, e.g., Circular Polarization Selective Surface (CPSS), is used to reduce the computation time in similarly reoccurring integrals. Both aspects pay off when structures get more complex. For one structure, a reduction of computational time with a factor 4.5 was achieved as compared to a full EFIE solver without reduction.