Abstract
In this paper, we propose a novel Multibranch-Linear-Linear basis function based adaptive accuracy enhanced (MB-LLB-AAE) method to solve the scattering problem from multiscale perfect electric conductor (PEC) targets. The calculation accuracy of traditional magnetic-field integral equation (MFIE) and combined field integral equation (CFIE) is not as good as that of electric-field integral equation (EFIE) under the same mesh size. The proposal of MBLL basis function has solved the accuracy problem of MFIE and CFIE when calculating multiscale PEC targets to a certain extent. However, a MB-LL basis function has two unknowns on a common edge, thus generating a prohibitive computational cost when calculating multiscale targets. Based on this problem, we propose the novel MB-LLB-AAE method, which not only effectively reduces the consumption when calculating multiscale targets, but also maintains an accuracy similar to that of using the MB-LL basis function only. Several numerical examples prove the advantages of the proposed method.