Bob.. I think the wave equation comes from Maxwell's curl E and curl H
equations.. a minor slip, but elegant explanation of D.
Also, your Top Gun book is spledid!
Cheers
Joe VO1NA
On Thu, 5 Sep 2002, Robert Brown wrote:
> Friends in Radio Land
>
> The electromagnetic variable D and the displacement current
> density dD/dt were introduced in Maxwell's Equations so as to make
> current continuous around a circuit containing capacitors.
>
> The beauty of the idea is that it compliments Faraday's Law -
> time-varying magnetic fields (dB/dt) generate electric fields (E) -
> by having time-varying displacement (dD/dt) generating magnetic
> fields (B).
>
> As a result, Faraday's Third and Fourth Equations may be combined
> to obtain an equation predicting electromagnetic wave motion, as
> observed by Herz and the basis of all of ham radio.
>
> Just think of an antenna and its ground system as a discrete component,
> a big capacitor, and RF current is continuous around your output circuit.
>
> 73,
>
> Bob, NM7M
>
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