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PROGRAM:

NAME


create_bmp_for_stripline_coupler - bitmap generator for coupler with thin striplines
between two infinitely wide groundplanes (part of atlc)

SYNOPSIS


create_bmp_for_stripline_coupler [-C] [-b bitmapsize] [-v] H w s Er outputfile

WARNING


This man page is not a complete set of documentation - the complexity of the atlc project
makes man pages not an ideal way to document it, although out of completeness, man pages
are produced. The best documentation that was current at the time the version was
produced should be found on your hard drive, usually at
/usr/local/share/atlc/docs/html-docs/index.html
although it might be elsewhere if your system administrator chose to install the package
elsewhere. Sometimes, errors are corrected in the documentation and placed at
http://atlc.sourceforge.net/ before a new release of atlc is released. Please, if you
notice a problem with the documentation - even spelling errors and typos, please let me
know.

DESCRIPTION


create_bmp_for_stripline_coupler is a pre-processor for atlc, the finite difference
program that is used to calculate the properties of a two and three conductor electrical
transmission lines of arbitrary cross section. The program
create_bmp_for_stripline_coupler is used as a fast way of generating bitmaps (there is no
need to use a graphics program), for a pair of 1 pixel thick conductors of width w, spaced
a distance s apart, inside a pair of groundplanes of separation H. This has an exact
analytical answer, when the inner is infinitely thin and the overall width W is infinitely
wide. This theoretical impedance is calculated and printed to stderr if the -v option is
given on create_bmp_for_stripline_coupler's command line.

----------------------------------------------------- ^
| | |
| Er | |
| | |
| ----------- ----------- | H
| <----w----><--s--><----w----> | |
| | |
| | |
| | |
----------------------------------------------------- v
<-------------------------W------------------------->

The overall width W is calculated internally to be large enough that making it any larger
will have negligible effect on the results. The dielectric is assumed that of vacuum.

The bitmaps produced by create_bmp_for_stripline_coupler are 24-bit bit colour bitmaps, as
are required by atlc.

OPTIONS


-C
Print the full copyright information and exit.

-b bitmapsize
is used to set the size of the bitmap, and so the accuracy to which atlc is able to
calculate the coupler's properties. The default value for 'bitmapsize' is normally 18
although this can be set at compile time. (see 'DEFAULT_COUPLER_BITMAP_SIZE' in
definitions.h). The value can be set anywhere from 6 to 28. The size of bitmap produced
will be between 2^(bitmapsize-1) and 2^(bitmapsize+1), so if its set to 28 the bitmap
could be as big as 512 Mb, which would take an eternity to compute.

-v
Print some extra data to stdout on the theoretical impedance of the structure. This is
useful to compare with the numerical result from atlc

EXAMPLES


In the first example, a standard coupler is created, where the

eg1. create_bmp_for_stripline_coupler 1.23 0.7 1.2 1.0 coupler.bmp
eg2. create_bmp_for_stripline_coupler -b 8 1.23 0.7 3.3 small.bmp
eg3. create_bmp_for_stripline_coupler -v 12 1.23 0.7 4.8 theory.bmp

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