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       create_bmp_for_rect_cen_in_rect  -  bitmap  generator  for  rectangular
       conductor inside rectangular conductor (part of atlc)


       create_bmp_for_rect_cen_in_rect [options... ] W H w h Er outfile.bmp


       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
       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 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.


       create_bmp_for_rect_cen_in_rect is a pre-processor for atlc, the finite
       difference  program  that is used to calculate the properties of a two-
       conductor electrical transmission line of arbitrary cross section.  The
       program  create_bmp_for_rect_cen_in_rect  is  used  as  a  fast  way of
       generating bitmaps (there is no need to use a graphics program), for  a
       rectangular  conductor  placed  centrally  inside  another  rectangular
       conductor, like this:

       -----------------------------------------------------  ^
       |                                                   |  |
       |            Dielectric, permittivity=Er            |  |
       |                                                   |  |
       |                                                   |  |
       |                                                   |  |
       |             <----------w----------->              |  |
       |             ------------------------   ^          |  |
       |             |                      |   |          |  |
       |             |  Metallic conductor  |   |          |  H
       |             |  conductor (must be  |   h          |  |
       |             |  in  the centre)     |   |          |  |
       |             |                      |   |          |  |
       |             ------------------------   ^          |  |
       |                                                   |  |
       |                                                   |  |
       |                                                   |  |
       |                                                   |  |
       |                                                   |  |
       |                                                   |  |
       -----------------------------------------------------  |

       The parameters ’W’ and ’H’  and  the  inner  dimensions  of  the  outer
       conductor.   The  outer  dimensions  of the inner conductor are ’w’ and
       ’h’. The inner conductor is assumed be be placed centrally  inside  the
       outer conductor. The spaced between the two conductors is filled with a
       dielectric of relative permittivity Er

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

       The  permittivity  of the bitmap, set by ’Er’, determine the colours in
       the bitmap. If Er is 1.0, 2.1, 2.2, 2.33, 2.5, 3.3, 3.335, 4.8 or 10.2,
       then  the  colour  corresponding  to  that  permittivity  will  be  set
       according to the colours defined in COLOURS below. If Er is not one  of
       those  permittivities, the region of permittivity Er will be set to the
       colour  0xCAFF00.   The  program  atlc  does  not   know   what   these
       permittivites  are,  so  they  atlc,  must be told with the comand line
       option -d, as in example 4 below.


       -b bitmapsize
       is used to set the size of the bitmap, and so  the  accuracy  to  which
       atlc  is  able  to  calculate  the  transmission line’s properties. The
       default value for ’bitmapsize’ is normally 4, although this is  set  at
       compile time. The value can be set anywhere from 1 to 15, but more than
       8 is probably not sensible.

       -f outfile
       Set the output filename. By default, the bitmap is sent to stdout,  but
       it *must* be sent to a file, with this option, or as described above.

       Causes create_bmp_for_rect_cen_in_rect to print some data to stdout.


       The 24-bit bitmaps that atlc expects, have 8 bits assigned to represent
       the amount of red, 8 for blue and 8 for  green.  Hence  there  are  256
       levels  of  red, green and blue, making a total of 256*256*256=16777216
       colours.  Every one of the possible 16777216  colours  can  be  defined
       precisely  by  the  stating the exact amount of red, green and blue, as

       red         = 255,000,000 or 0xff0000
       green       = 000,255,000 or 0x00ff00
       blue        = 000,000,255 or 0x0000ff
       black       = 000,000,000 or 0x000000
       white       = 255,255,255 or 0xffffff
       Brown       = 255,000,255 or 0xff00ff
       gray        = 142,142,142 or 0x8e8e8e

       Some colours, such as pink, turquoise, sandy, brown, gray etc may  mean
       slightly  different  things  to  different  people. This is not so with
       atlc, as the program expects the colours below to be EXACTLY defined as
       given. Whether you feel the colour is sandy or yellow is up to you, but
       if you use it in your bitmap, then it  either  needs  to  be  a  colour
       recognised  by  atlc,  or you must define it with a command line option
       (see OPTIONS and example 5 below).
       The following conductors are recognised by atlc:
       red    = 255,000,000 or 0xff0000 is the live conductor.
       green  = 000,255,000 or 0x00ff00 is the grounded conductor.
       blue   = 000,000,000 or 0x000000 is the negative conductor

       All bitmaps must have the live (red) and  grounded  (green)  conductor.
       The  blue  conductor is not currently supported, but it will be used to
       indicate a negative conductor, which will be needed if/when the program
       gets extended to analyse directional couplers.

       The following dielectrics are recognised by atlc and so are produced by

       white      255,255,255 or 0xFFFFFF as Er=1.0   (vacuum)
       pink       255,202,202 or 0xFFCACA as Er=1.0006 (air)
       light blue 130,052,255 or 0x8235Ef as Er=2.1   (PTFE)
       Mid gray   142,242,142 or 0x8E8E8E as Er=2.2   (duroid 5880)
       mauve      255.000,255 or 0xFF00FF as  Er=2.33   (polyethylene)  yellow
       255,255,000 or 0xFFFF00 as Er=2.5   (polystyrene)
       sandy      239,203,027 or 0xEFCC1A as Er=3.3   (PVC)
       brown      188,127,096 or 0xBC7F60 as Er=3.335 (epoxy resin)
       Turquoise  026,239,179 or 0x1AEFB3 as Er=4.8   (glass PCB)
       Dark gray  142,142,142 or ox696969 as Er=6.15  (duroid 6006)
       L. gray    240,240,240 or 0xDCDCDC as Er=10.2  (duroid 6010)
       D.  orange   213,130,067  or  0xD5A04D  as  Er=100.0  (mainly  for test
       If the permittivity is one not in the above list, then those  parts  of
       the image with Er will be set to 0xCAFF00.


       Here  are a few examples of the use of create_bmp_for_rect_cen_in_rect.
       Again,   see   the   html   documentation   in    atlc-X.Y.Z/docs/html-
       doc/index.html for more examples.

       1)  In the first example, there is just a vacuum dielectric, so Er=1.0.
       The inner of 1x1 inches (or mm, miles etc) is placed  centrally  in  an
       outer with dimensions 3.3 x 3.9 inches.

       % create_bmp_for_rect_cen_in_rect 3.3 3.9 1 1 1 > 1.bmp
       % atlc 1.bmp

       2)  In  this second example, an inner of 15.0 mm x 5.0 mm is surrounded
       by an outer with internal dimensions of 71.5 x  60.0  mm.  There  is  a
       material with permittivity 2.1 (Er of PTFE) around the inner conductor.
       The output from  create_bmp_for_rect_cen_in_rect  is  sent  to  a  file
       2.bmp, which is then processed by atlc

       % create_bmp_for_rect_cen_in_rect 71.5 60.0 15.0 5.0 2.1 > 2.bmp
       % atlc 2.bmp

       3)  In  example 3, the bitmap is made larger, to increase accuracy, but
       otherwise   this   is   identical   to   the   second    example.     %
       create_bmp_for_rect_cen_in_rect -b7 71.5 60 15 5 2.1 > 3.bmp
       % atlc 3.bmp

       In      the     fourth     example,     instead     of     re-directing
       create_bmp_for_rect_cen_in_rects output to a file with the > sign,  it
       is done using the -f option.
       % create_bmp_for_rect_cen_in_rect -f 4.bmp 61.5 28.1 5 22 2.1
       % atlc 4.bmp


       atlc(1)  create_bmp_for_circ_in_circ(1)  create_bmp_for_circ_in_rect(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)                - Home page       - 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