bandpass filter signal processing

Hi all,

I am very new to COMSOL, forgive me if I've asked silly questions...
Anyhow, my goal is to define some parameters (i.e. resistance, capacitance, and inductance) of a RLC bandpass filter, which would take a single short pulse (~1THz) and filter out "higher order" harmonics in frequency domain, retaining only the first harmonic, and finally convert it back to time domain.

So my question is, how do I go about obtaining some plots for time/freq domain for the signal alone? and throwing in the RLC circuit in there? PS I've done the tutorial for AC/DC module but didn't help too much.

Thanks in advance!