An Effective Extraction Method of Common Characteristic Basis Functions for 3D Rough Surfaces Scattering Computation

The paper proposes a new and effective extraction method to generate the common character basis function (CCBF) in EM computation of 3D rough surfaces. The extraction process is based on Kirchhoff Approximation (KA) method and then the calculated CCBFs can be applied to different samples with the same roughness regardless of illumination condition. Under the limit of KA algorithm, the new extraction method can accelerate the generating process by 2000 times and ensure mean error under 3 dB.