NAME
create_bmp_for_stripline_coupler - bitmap generator for
coupler with thin striplines between two infinitly wide
groundplanes (part of atlc)
SYNOPSIS
create_bmp_for_stripline_coupler [-C] [-b bitmapsize] [-v] H
w s Er outputfile
DESCRIPTION
create_bmp_for_stripline_coupler is a pre-processor for
atlc, the finite difference programme that is used to calcu-
late the properties of a two and three conductor electrical
transmission lines of arbitrary cross section. The programme
create_bmp_for_stripline_coupler is used as a fast way of
generating bitmaps (there is no need to use a graphics pro-
gramme), 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 infin-
itely wide. This theoretical impedance is calculated and
printed to stderr if:
a) The -v option is given on
create_bmp_for_stripline_coupler's command line. AND
b) create_bmp_for_stripline_coupler was linked against the
gsl library at http://sources.redhat.com/gsl/
----------------------------------------------------- ^
| | |
| 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 negligable 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 pro-
duced 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 theoetical impedance
of the structure. This is useful to compare with the numeri-
cal 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
SEE ALSO
atlc(1) create_bmp_for_circ_in_circ(1)
create_bmp_for_circ_in_rect(1)
create_bmp_for_microstrip_coupler(1)
create_bmp_for_rect_cen_in_rect(1)
create_bmp_for_rect_cen_in_rect_coupler(1)
create_bmp_for_rect_in_circ(1)
create_bmp_for_rect_in_rect(1)
create_bmp_for_symmetrical_stripline(1) design_coupler(1)
find_optimal_dimensions_for_microstrip_coupler(1) readbin(1)
http://atlc.sourceforge.net - Home page
http://sourceforge.net/projects/atlc - Download area
atlc-X.Y.Z/docs/html-docs/index.html - HTML docs
atlc-X.Y.Z/docs/qex-december-1996/atlc.pdf - theory paper
atlc-X.Y.Z/examples - examples
http://www.david-kirkby.co.uk - my home page
http://www.david-kirkby.co.uk/ham - ham radio pages
AUTHOR
Dr. David Kirkby PhD, email drkirkby@ntlworld.com, G8WRB.
COPYRIGHT
Copyright (c) 2002 Dr. David Kirkby.
This program is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later ver-
sion. This program is distributed in the hope that it will
be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTIC-
ULAR PURPOSE. See the GNU General Public License for more
details. You should have received a copy of the GNU General
Public License (in the file COPYING) along with this pro-
gram. You may get a full copy of it by running the programme
with the -C option. Otherwise you can write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Bos-
ton, MA 02111-1307, USA.
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