Topband: Displacement current

Joe Craig jcraig@morgan.ucs.mun.ca
Thu, 5 Sep 2002 11:11:11 -0230 (NDT)


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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