It is said that a transmitted UWB pulse should not have any DC because
of the transmitting antenna:



"Without getting into the details of the physical generation of UWB
waveforms, it is sufficient to note in this regard that the
transmitting antenna has the general effect of differentiating the time
waveform presented to it. As a consequence the transmitted pulse does
not have a DC (direct current) value-the integral of the waveform
over its duration must equal zero."

(page 4,
http://www.antd.nist.gov/wctg/manet/...rt_April03.pdf)

Would someone please explain that for me?

Thanks!

-- Harry