A Fast Hybrid Method for EM Analysis of Electrically Large Metal Space Frame Radomes

This letter proposes a fast hybrid method that combines the physical optics (PO) method and aperture integration-surface integration (AI-SI) method for electromagnetic (EM) radiation analysis of electrically large metal space fame radomes. First, the magnetic or/and electric fields on the surface of the metal space frame and inner surface of the dielectric radome are calculated by the Stratton-Chu equation. Second, the scattering fields from the metal space frame are calculated by the PO method, and the transmitted fields on the outer surface of the dielectric radome are determined by the transmission coefficient calculated by the network theory. To accelerate the implementation of the procedure, an efficient parallelization scheme is adopted, and the Lagrange interpolation is used to calculate the transmission coefficients. Numerical results demonstrate that there is a good agreement between the proposed method and the numerical method, and the computation can be accelerated by 3.9 times with interpolation.