View Single Post
  #5   Report Post  
Old July 10th 08, 06:23 PM posted to rec.radio.amateur.antenna
Richard Harrison Richard Harrison is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 588
Default series circuit for fractional WL antennas

Art wrote:
"If I had a lab it would be easy to prove whether the distributed
capacitance and distributed inductance are themselves in parallel within
the radiating member instead of in series such that the energy retention
qualies are kept."

J.C. Maxwell, also an Englishman, had no lab.

Radiation is the function of a radio antenna. Kept energy is not so
important.

Recall that Maxwell`s great speculation was that displacement currents
generated a magnetic field the same as conductive currents. Later, this
was proved beyond doubt. It is a radiation requirement as no conductors
inhabit empty space.

My edition of the "ARRL Antenna Book" is the 20th, which means its
contents have been refined and tested over many years. It says on page
2-6:
"Now we just compared the antenna to a series-tuned circuit. Near its
half-wave resonant frequency, a center-fed lambda/2 dipole exhibits much
the same characteristics as a series-resonant circuit."

J.C. Maxwell died in 1879 at an age of 48 years, 8 years before Heinrich
Hertz generated the first man-made intentional electromagnetic waves.
These proved Maxwell correct. Oliver Heaviside, a Scot, born in 1850,
decided to teach himself the contents of Maxwell`s "Electromagnetic
Theory" and in 1887 started "dumbing down" Maxwell in a series of
articles published in an English magazine, "The Electrician". That was
the beginning of modern communication engineering.

Oliver Heaviside once said, "Let mathematics be humanized if possible.
The best of proofs is to set out a fact descriptively so that it can be
seen to be a fact."

Heaviside proves that all who are born in Edinburgh or London are not
fools.

Best regards, Richard Harrison, KB5WZI