Re: NEC-LIST: How can I use the currents in the out files ot computefar filed?

I am so grateful to receive quick replies from Lux, Jerry and Phil.
Initially, I just wonder to know how I can use the currents in the out files
,so I take an array of dipoles as an example. Actually, I am dealing with a
sector array of horizontal polarized traveling-wave antennas at HF band. The
element is a direcitonal antenna, with a 30-60 degrees beamwidth. I don't
know much about antenna couplings. Whant I want to do is just to see how
the element's pattern differs from its own pattern when used alone. If the
difference is tolerable, we can neglect the couplings between elements and
use their own patterns.Is the way I am thinking is right? I know that the
couplings between elements of a dipole array is serious, Lux and Phil both
gave me a good suggestion. Is there any other potential problems when using
a array of directional elements except considering the pattern?

Finally ,I take Jerry's means. I find the Do 17 loop of the subroutine
'FFld' in source files and recompile it. It is so easy and fantastic. The
only drawback is not flexible, but it is enough for me.

Thanks again.
               sincerely
                     Xiaolin Zhang
                      24/10/09

-------------------------------------------------
From: "Phil Ede" <phil.ede_at_tiscali.co.uk>
Sent: Saturday, October 24, 2009 3:43 AM
To: "张小林" <xlzhang0606_at_163.com>
Cc: <nec-list_at_robomod.net>
Subject: Re: NEC-LIST: How can I use the currents in the out files ot
computefar filed?

> Dear Xiaolin
>
> I think this may work to derive an approximate embedded pattern for an
> element away from the edge if the coupling between elements is not too
> . Generate a sub array (say 30 to 50 elements) and terminate all but
> the central element, which you then drive in the usual way using an RP0
> command. You will need to generate use a current source for this and
> the resulting pattern should be symmetrical. You can then use pattern
> multiplication to generate the pattern for the entire array.
> The answer will not be exact because the pattern will change for
> elements towards the edge of the whole array.
>
> Phil Ede
>
>
> ----- Original Message -----
> From: <xlzhang0606_at_163.com>
> To: <nec-list_at_robomod.net>
> Sent: Friday, October 23, 2009 9:16 AM
> Subject: NEC-LIST: How can I use the currents in the out files ot
> computefar
> filed?
>
>
>> hi, friends,
>>
>> I am modeling an array of dipoles by nec-2 and I want to get the far
>> field contributed by each element of the array. Nec-2 cannot give the
> data,
>> so I plan to read the currents and segments in the out files to compute
> the
>> far field. After I read the nec-2 manual ,I know the work is a little
>> complicated. There are too many complex formulas. Did anyone do the
> similar
>> work before? Any suggestion will be welcome.
>>
>> Xiaolin Zhang
>> 23/10/09
>>
>>
>>
>

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