Harry,

Forget all the nonsense about photons, continuity of space, and other
blather. This is simply a matter of mathematics.

In general the initial waveform will consist of a constant DC level and
a number of AC components. Any DC component in the original pulse is
lost when the pulse is differentiated by the transmitting antenna,
leaving only the differentiated AC components. Therefore the integral of
the differentiated waveform has a zero DC value. Of course one could
always add in a constant to the integrated result, but that would not
have much physical meaning in the context under discussion.

73,
Gene
W4SZ

Harry wrote:
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