Generation of Gaussian Beam in FDTD using Surface Current Source

In this paper, the implementation of Gaussian beam in FDTD using surface current source is proposed. By appropriately introducing a Gaussian-distributed surface current source into the computational domain of FDTD, the propagation of a Gaussian beam can be accurately simulated. A numerical example is given, and its results are compared with CST with a peak-to-peak amplitude error of less than 0.2 dB, proving the correctness of the implementation.