Research on Boundary Conditions of Near-Far Field Extrapolation Based on FCC-FDTD Method

This paper mainly studies the iterative formula of the near field extrapolation of the three-dimensional transient field based on the Huygens' principle under the FCC grid condition. Then, the backward RCS of the metal ball was calculated to verify the correctness of the method based on FCC-FDTD. The calculation accuracy of the method was compared with that of the traditional FDTD method. The results show that the calculation accuracy of the method is higher than that of the traditional FDTD method, which shows the superiority of the method.