Multilevel fast multipole algorithm enhanced characteristic mode analysis for half-space platform

The increasingly popular characteristic mode analysis (CMA) techniques in the free-space have been well-established, while the half-space counterpart is less concerned. In this communication, we consider the CMA for half-space platforms such as vehicles on the ground and ships on the sea surface, which is also commonly mounted with antennas. To overcome the difficulty of CMA’s application on electrically large targets, the half-space multilevel fast multipole algorithm is integrated into the eigensolver. Numerical results of half-space CMA for realistic platforms from FM-band to L-band are presented to validate the accuracy and the robustness of the proposed method. It has been shown that this communication can be used as a legitimate CMA tool for the antenna design and integration on half-space platforms.