FDTD analysis of linear antennas driven from a discrete impulse excitation

The finite-difference time-domain (FDTD) technique has been employed to analyze a large number of electromagnetic scattering problems. However, only a limited number of problems involving antenna radiation has been investigated. Furthermore, the excitation source of the radiating systems has been mostly a Gaussian type pulse. The concept of a discrete impulse excitation is developed and used to feed linear antennas and other radiating systems. Different cases of antenna analysis are considered to illustrate the applicability of the impulse excitation. Furthermore, a comparison with the method of moments as well as the FDTD technique with Gaussian type pulse excitations is made to validate the presented technique.