Re: NEC-LIST:Example helix antennas for NEC2?

Hi John

You may want to consider using SuperNEC.
SuperNEC has a helical antenna assembly which makes it very easy to create a
helices as you only require inputting physical data such as what spacing you
require between turns, the base radius of the helix and the tip radius and
total length of helix, and then the model is automatically generated (No
need to write NEC2 file) or look at text files for input or output.

In addition SuperNEC will be releasing the latest version 2.3 on the website
at www.supernec.com within the next 2 weeks with a Genetic Algorithm
optimiser. This optimiser allows antenna assemblies, such as the helical
one, to be easily optimised for gain and input impedance at the same time.
Infact I ran some optimisations on helices at 1GHz (optimising for Gain and
VSWR )and got some very pleasing results. This is a very small problem for a
GA optimiser.If you are interested in some of the results for the helices
that i simulated at around 1GHz please let me know.

I hope the above may prove useful.
Regards
Brandon

----- Original Message -----
From: "John Mock" <kd6pag_at_qsl.net>
To: <nec-list_at_gweep.ca>
Sent: Wednesday, July 03, 2002 7:02 PM
Subject: NEC-LIST:Example helix antennas for NEC2?

> I've tried a number of things myself and searched the net, but haven't
> had much luck coming up with good NEC2 models for UHF/microwave helical
> antennas. The models i've seen (or come up with myself) so far either
> give plausible gain figures or reasonable impedence values, but i'm not
> succeeding in getting both at once. I have designed and built several
> interesting antennas using NEC2 with homebrew front-ends/post-processing,
> and i want to make sure i'm seeing plausible and stable modeling results
> before attempting construction. Alas, i'm not so far, in spite of large
> numbers of runs.
>
> Can anyone provide a NEC2 deck which models a >=5 turn helical antenna
well
> both in terms of gain and impedence?
> -- KD6PAG
> --
> The NEC-List mailing list <nec-list_at_gweep.ca>
> http://www.gweep.ca/mailman/listinfo.cgi/nec-list

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