IN recent years, the finite-difference time domain (FDTD) method has e
merged as one of the most popular full-wave numerical techniques for e
lectro-magnetic (EM) simulation due to its high level of accuracy, its
usefulness for a broad range of structures, and its suitability for c
omputer solution. (1)Two examples illustrate the use of the FDTD metho
d to design personal-communications-services (PCS) antennas in the 2 G
Hz operating band.