Reg Edwards wrote:
I am not trolling.
What I want to know is the radiation resistance, referred to the base,
of a short vertical wire above a perfect ground, the current in the
wire being assumed uniformly distributed.
The radiation resistance at the base is in the form of -
C * Square( Length / Lambda )
where Length is the physical length or height of the wire and Lambda
is the free-space wavelength.
What is the value of the constant C ?
Reg, I believe it would be 10*pi^2 = 98.7, half of the
value of a small dipole. Balanis gives a dipole a very
thorough treatment and then says the monopole is half
of those values. His constant in the value of radiation
resistance for a short dipole is 20*pi^2. Kraus rounds
that constant off to 200. That value assumes the short
dipole is not infinitessimal and has a linear standing
wave current distribution. That constant doesn't seem
to need to be a very exact value.
--
73, Cecil
http://www.qsl.net/w5dxp