RE: NEC-LIST:END EFFECT

Doug Werner of Penn State solved the problem of a straight wire of arbitrary
radius, and published the results in about 1995 in the IEEE Antennas and
Propagation Transactions. He then worked up a method-of-moments code to test
out when the "thin wire assumption" broke down. I think he published some of
that also. His code could be used to answer the questions about end effect for
specific example cases. I dont know if Doug is on NEC-LIST or not, but maybe
some of the PSUers who are on the LIST could pass this along to him for
comment.

George

Original Message:
-----------------
From: ken hanson kentenna_at_yahoo.com
Date: Sat, 6 Oct 2001 15:05:20 -0700 (PDT)
To: nec-list_at_gweep.ca, nec-list_at_gweep.ca
Subject: NEC-LIST:"END EFFECT"

NEC-LIST:

 Does any one know when end effect stops as the
diameter of a dipole in increased.???????
OR:
Does any one know when end effect stops as the spacing
of a folded dipole in increased.???????
AND:
Does any one not know that a fullwave loop has no end
effect.???????

    Previous wording of a similar question:

        A folded dipole uses the formula 468/f.
 A Quad loop uses a full wave by the formula 1005/f.

      Does any one have a graph or other data for
 antennas that are between the shape of a folded
dipole
 and a quad loop, in particular one that would be
984/f
 in total wire length.

 Ken----KO6RK

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