A mutual coupling algorithm between antennas on a platform based on SWE and UTD

For mutual coupling evaluation between antennas on the platform, present an enhanced algorithm that combines the spherical wave expansion (SWE), the uniform theory of diffraction (UTD), and the reaction theorem to accurately calculate the mutual coupling between two antennas mounted on a platform. The algorithm begins by employing SWE to compute the direct electromagnetic field radiated by the antennas. Subsequently, UTD is introduced to capture the field scattered by the platform. Finally, the mutual coupling is evaluated through the reaction integral. Numerical examples highlight the algorithm's promising speed and accuracy, surpassing the performance of the MLFMA and MoM-UTD methods. With a computational complexity of O(LMN3), our approach offers significant improvements for mutual coupling analysis in platform-based antenna systems.