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Old October 20th 07, 10:35 PM posted to rec.radio.amateur.antenna
Richard Fry Richard Fry is offline
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First recorded activity by RadioBanter: Jun 2006
Posts: 440
Default "Balancing" versus "cancelling"

"art" wrote
Looking thru various antenna pages on the web and I continually
find reference to inductance CANCELLING capacitance.
The operative word should be BALANCING and the difference is
important. In all cases the capapicitor is still there and operative
as is the inductance. One cannot say they are cancelled so they can be
disregarded. etc etc

__________

No matter what one calls it, equal inductive and capacitive reactance at the
input terminals of an antenna system (eg, resonance) is important only in
achieving the most efficient power transfer from a source connected to those
input terminals having an impedance matching the remaining pure
(non-reactive) resistance of the antenna system

== Antenna system reactance neither absorbs source power nor radiates,
whether such reactance is capacitive, inductive, or in "balance /
equilibrium." ==

Only pure radiation resistance will do so, and that is set by the natural
radiation resistance of the antenna conductor(s), which in turn is related
to the mechanical and electrical configuration of the radiating structure,
and the operating frequency.

Setting up equal inductive and capacitive reactance values at the antenna
system input terminals means that the real radiating structure of the
antenna will receive the maximum power possible from a matched transmission
line, which will maximize the fields that the system can produce from the
net power available from the transmitter.

RF