This study analyzes the effect of complex frequency shifting perfectly matched layer (CFS-PML) settings on the accuracy of mutual interference analysis during wide-angle beam scanning of a large array antenna. The variation in the absorption performance of PML according to its parameters and angle of incidence is quantitatively analyzed and validated through simulations. At wide scanning angles, the wave impinges on the PML boundary at near-grazing incidence, which increases the residual reflections and degrades the accuracy of the Huygens surface. For scanning angles exceeding 75°, the resulting error surpasses 15 %, causing inaccuracies of up to 7 dB in the overall mutual interference analysis. Therefore, this study emphasizes the criticality of optimizing the PML parameters while considering the beam-steering angle to achieve a precise interference analysis for platform-mounted large-array antennas.
Kim et al. (Sun,) studied this question.