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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