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Abstract
This paper employs the higher-order method of moments (MoM) based adaptive integral method (AIM) to analyze Non-Uniform Rational B-Spline (NURBS) surfaces modeled 3D PEC problem. It employs a quadrature points based projection procedure, in which the basis functions can be expanded with much fewer Dirac delta functions defined on the grid nodes than the commonly used AIM. Meanwhile, the Gaussian interpolation formula is introduced to enlarge the grid space which can also improve the efficiency of the proposed method. Accordingly, the new method can deal with electrically large problems properly, due to the accuracy of the NURBS surfaces in geometry modeling and the efficiency of higher-order AIM in computational and memory costs. Numerical results show the validity of the new method.