Antenna Simulation in LTspice

>
> For a loop antenna with a secondary, there is voltage across the antenna
> winding and current through it.  Which is the secondary responding to?


  Since you can't have  a current thorough the antenna without a voltage 
the answer is both, It is a chicken and an egg situation tied together 
by Ohm's Law.

Jeff

"Jef" <jeff@assystems.com> wrote in message 
news:khpa7e$so2$1@speranza.aioe.org...
>> For a loop antenna with a secondary, there is voltage across the 
>> antenna
>> winding and current through it.  Which is the secondary responding to?
>
>
>  Since you can't have  a current thorough the antenna without a voltage
> the answer is both, It is a chicken and an egg situation tied together 
> by Ohm's Law.

That said, low impedances look like constant voltage sources or shorts, 
and carry a lot of current, while high impedances look like constant 
current sources or opens, and develop a lot of voltage.  It's plenty of an 
approximation, but when you call an SWR < 1.2 a good match, it doesn't 
take much in either direction to produce that.

This is relative to system impedance (50 ohms, say), or if not in a system 
with characteristic impedances, then some factor of Zo (377 ohms).  At 
"lumped constant" frequencies, Zo and SWR and stuff aren't all that 
relevant anymore, but the concepts always apply.

Tim

-- 
Deep Friar: a very philosophical monk.
Website: http://seventransistorlabs.com