Abstract: The infinitesimal gap mode of a thin-wire dipole antenna is used in FDTD Calculations. The antenna input impedance of thin-wire dipole antenna is calculated using performing deconvolution Gaussian type pulse source. The antenna input impedance's FDTD calculation result of the different excitation source location point's thin-wire dipole antena (center-fed dipole, 1/8-fed dipole, 1/4-fed dipole, and 31/8-fed dipole) are given and discussed. Furthermore, the antenna input impedance's FDTD calculation result of center-fedthin-wire dipole antenna agrees well with the MoM's calculation result.

Key words: thin-wire antenna, antenna input impedance, FDTD method, excitation source