plane waves in free space

["Brian T. Schwartz" <Brian.Schwartz@Colorado.EDU>]

Hi folks,

I'm still trying to find the s-parameters for a structure.

But at this point, however, I am simply trying to propagate a plane wave
pulse across a region of free space to eventually find s21 = t = 1, and
s11 = r = 0.

I figure I should see the plane wave in my xy-probe, and after the pulse
is done, I should see nothing in the contour plot.  But this does not
happen. The pulse comes and goes, but there is residual field that
continues seemingly forever.

Any ideas on what I'm missing?

1.  I'm using PML's.

2.  My source is a plane wave, not part of the model geometry.  So there's
no hard source issues.

3.  I see the source waveform in View Source Waveforms", and my simulation
runs far after when the pulse is over.

Brian.