View Single Post
  #8   Report Post  
Old November 12th 07, 02:23 AM 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 Distributed capacitance and antennas

Art wrote:
"Same question, but now look at distributed inductaance and how that
works!"

On page 2 of Terman`s 1955 opus is written:
"The strength of the wave mmeasured in terms of microvolts per meter of
stress in space is also exactly the same voltage that the magnetic flux
of the wave induces in a conductor 1 m long when sweeping across this
conductor with the velocity of light."

Remember reciprocity and the fact that only a perfectly matched antenna
can extract as much as half the power in the wave. The antenna`s
radiatiation resistance acts as a Thevenin source when receiving and
reradiates the other half of the power received but not delivered to the
load.

The description of magnetic flux inducing signal into a receiving
antenna may be the cause of describing transmitting antennas as creating
from current in the wire a magnetic flux around the wire which almost
simultaneously produces an electric field which almost simultaneously
produces a magnetic field ad infinitum.

Best regards, Richard Harrison, KB5WZI