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Old March 11th 06, 04:15 PM posted to rec.radio.amateur.antenna
Richard Harrison
 
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Default Current through coils

Roy Lewallen, W7EL wrote:
"The mathematical treatment in King is quite complex. But nowhere does
he mention any traveling, reflected, or standing current, power, or
energy waves, or that inductance behaves any differently in an antenna
than in a lumped circuit.."

Maybe something was overlooked. The above is just more squid ink.

Kraus characterizes inductors as helices. At one extreme they are
stretched into straifht wires. At the other they collapse into single
loops.

After years of wrangling it is time to admit that the old authors are
right.

King and Wing were associates at Harvard.

Alexander H. Wing wrote on page 3 of "Transmission Lines, Antennas, and
Wave Guides":
"5. Distributed constants - The Transmission line cannot be analyzed as
a simple series circuit, because the current in the wires is not
everywhere the same."

J.D. Kraus wrote on page 185 of his 1950 edition of "Antennas":
"Thus, a helix with circumference too small for the axial mode of
radiation (circumferennce less than 2/3 wavelength) has a nearly
sinusoidal current distribution, caused by alternate reinforcement and
cancellation of two oppositely directed traveling waves on the helix of
nearly equal amplitude Izero as suggested in Fig. 7-13c. Both traveling
waves are of the Tzero transmission mode type."

I expedct no one will throw in the towel, but do expect more squirts of
squid ink.

Best regards, Richard Harrison, KB5WZI

 
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