how to obtain the radiation pattern of log-periodic antenna using C
language....need suggestions

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how to obtain the radiation pattern of log-periodic antenna using C
language....need suggestions

Try "Field Computation by Moment Methods", by Roger F. Harrington.
Available at www.bn.com for $120. NEC source code is available
in FORTRAN, so you could translate it to C.

Regards,

Frank

Frank wrote:
. . . NEC source code is available
in FORTRAN, so you could translate it to C.

It was done long ago. See
http://www.nic.funet.fi/pub/ham/ante...C/swindex.html for sources. A
google search might reveal others.

Roy Lewallen, W7EL

Roy Lewallen wrote:
Frank wrote:

. . . NEC source code is available
in FORTRAN, so you could translate it to C.


It was done long ago. See
http://www.nic.funet.fi/pub/ham/ante...C/swindex.html for sources. A
google search might reveal others.

Roy Lewallen, W7EL

A simpler approach, depending on the accuracy needed, might be to
convert some matlab codes. Orfanidis's book has matlab routines to do
the mutual coupling calculations and the transmission lines and to
generate a radiation pattern from the element currents. heck, he might
even have a LPDA model in there.. it would be a good exercise for a
class on computational electromagnetics. If it's a free space model,
that might be the easiest.

I have heard, but do not know from my own experience or anyone I know
(essentialy it is totally unsubstantiated rumor), that the NEC
repository C code version of NEC (converted by something like f2c) has a
number of problems. Given the age of the original FORTRAN code and its
coding style, I can believe that a machine translation might introduce
artifacts.

Roy Lewallen wrote in news:12up8vkq4oo8u56
@corp.supernews.com:

Frank wrote:
. . . NEC source code is available
in FORTRAN, so you could translate it to C.

It was done long ago. See
http://www.nic.funet.fi/pub/ham/ante...C/swindex.html for sources. A
google search might reveal others.

Easier said than done!

The port by the Otago Uni (NEC2++) looked promising, especially as they
integrated the S-N ground model code into the main programs and was real
fast, but it has subtle bugs. Unfortunately, their decision to make small
changes to the output format frustrates automated testing and comparison to
baseline versions, and it is a student project which seems to have stalled.

Owen