can a waveport provide a pulsed waveform in ansoft HFSS? How?

I want to give a pulsed electromagnetic wave to a dielectric substrate, is it possible to do this using the waveport?

I basically need to provide different types of waveforms to a dielectric and then see how the dielectric behaves. I must be able to set the amplitude and frequency of the waveform? For this, what do I use? must i use a waveport or is there some other option?