Steady State
Steady state simulations use the sinusoid source found
in the FDTD - Run
Paramenters - Voltage Source menu. This is very
useful to determine exact parameters of an
object at the specified input frequency. This
includes SAR values, efficiency, radiation
patterns, and input impedance. Many of these
values can be found by simply looking at the
Steady State Option in the Plot menu.
Transient
Transient simulations are excellent for determining the
general paramaters of an antenna over
a range of frequencies. Transient simulations use
a gaussian pulse, or one of its variations
as a source. By running a transient
simulation. One can easily determine the input
impedance over a large frequency range. This
allows you to find the resonant frequency
of an antenna, and gives you the information needed to
make changes to your design.