A Hybrid Method for the Calculation of Radiation Field from Opening in Shielding Enclosure

This paper presents a new hybrid method for the calculation of the radiation field outside the shielding enclosure. The method computes the tangential component of the electric field on the opening by finite difference time domain (FDTD) method to determine the equivalent magnetic current source. This magnetic current, once determined, can be used to ascertain the radiate field anywhere external to the opening in a shielding enclosure. The accuracy of the proposed method is verified by comparing the exterior radiation fields with those calculated by full FDTD and the traditional hybrid method. Simulation results show that the new hybrid method significantly reduces the computational effort and time, but still maintains satisfactory results. It also shows that the proposed method is very effective for the far field in that the computational effort, as compared with that of the near field, does not increase remarkably.