My masters thesis was a study of helical antennas, and the building of a
prototype helical array (hooray for me ...). I found that NEC was 100%
unreliable for helical antennas in both the so-called axial and normal
modes. It has to do with the fact that the helical antenna acts as a
waveguide structure that does not lend itself to NEC-like modeling. Kraus
and some others tried to characterize helical antenna gain using NEC-like
methods (actually closed form solutions), resulting in gross
overestimates. Some really good work was done by Aerospace Corp (King and
Wong) in the 1970's (?).
On Wed, 7 Aug 1996, Mike Slater wrote:
> I would appreciate any information pertaining to
> helical antenna performance using NEC. I have heard
> some remarks about NEC not being reliable, however,
> I have not been able to find any literature,
> results etc. that support or refute these claims.
> If anyone has any info/suggestions/links I would
> greatly appreciate any information.
>
> Thank you.
>
>
> Mike Slater
> mike_s_at_ece.concordia.ca
> mike_s_at_pils.com
>
>
Received on Thu Aug 08 1996 - 15:58:00 EDT
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