RCS Calculation of Multi-scale Targets by Iterative MOM-VSBR Method

• Published in: 2024 International Applied Computational Electromagnetics Society Symposium (ACES-China) pp. 1 - 3
• Main Authors: Cong, Zhou, Gu, Jihong, Bao, Huaguang, Ding, Dazhi, Liang, Enrui, Zhang, Tiancheng
• Format: Conference Proceeding
• Language: English
• Published: IEEE 16.08.2024
• Subjects: bidirectional ray tracing; Couplings; diffraction field; Electromagnetics; High frequency; Integral equations; Iterative methods; Method of moments; Physical optics; Ray tracing; Reflection; Scattering; surface currents iteratively updating
• DOI: 10.1109/ACES-China62474.2024.10699569

A new efficient hybrid technique is presented, which combines the method of moments (MoM) and the volume meshed shooting and bouncing ray (VSBR) for analyzing scattering of complex multi-scale structures. The multi-scale targets are divided into different sub-regions, and the scattering contributions from sub-regions with different electrical sizes are solved using different solvers. By applying the SBR method for the large scale sub-regions, a corrected incident field including not only the direct incident field but also the multi-bounce field from the SBR region contributes to the integral equation in the MoM sub-regions. For the VSBR region, it also considers the interaction from MoM region and then a physical optics type integration is performed to calculate the scattered field. For complex multi-scale electromagnetic problems, the proposed technique is more efficient and simpler to implement in a general-purpose computer code. Numerical results are presented to show the efficiency and accuracy of the method.