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


       create_bmp_for_rect_in_rect [options... ] W H a b  c  d  w  h  Er1  Er2


       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_in_rect  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 line of arbitrary cross
       section. The program create_bmp_for_rect_in_rect is used as a fast  way
       of generating bitmaps (there is no need to use a graphics program), for
       a rectangular  conductor  inside  a  rectangular  conductor,  with  two
       dieletrics, like this:

       -----------------------------------------------------  ^
       |                                                   |  |
       |     <--------------d------------------->          |  |
       |                                                   |  |
       |         <----------w----------->                  |  |
       |         ------------------------   ^              |  |
       |         |                      |   |              |  |
       |         |  Metallic conductor  |   |              |  H
       |<----b-->|  conductor (can be   |   c   Er1        |  |
       |         |  off-centre)         |   |              |  |
       |         |                      |   |              |  |
       |     ------------------------------------ ^        |  |
       |     |..................................| |        |  |
       |     |...Dielectric, permittivity=Er2...| |        |  |
       |<-a->|.....(can be off centre ).........| h        |  |
       |     |..................................| |        |  |
       |     |..................................| |        |  |
       -----------------------------------------------------  |

       The  parameters  ’W’  and  ’H’  and  the  inner dimensions of the outer
       conductor.  The outer dimensions of the inner  conductor  are  ’w’  and
       ’c’. The inner conductor is assumed to rest on a dielectric (Er2) which
       is ’d’ wide and outer conductor an the inner conductor  is  offset  ’b’
       from the left hand sidewall of the outer conductor. The whole region is
       surrounded  by  a  dielectric  of  relative  permittivity  ’Er1’.   The
       dielectrics ’Er1’ and then ’Er1’ and ’Er2’ will both be 1.0

       The bitmap is printed to the file specifiled as the last argument

       create_bmp_for_rect_in_rect -f filename.bmp W H a b c d w h Er1 Er2

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

       The permittivities of the bitmap, set by ’Er1’ and ’Er2’, determine the
       colours  in  the  bitmap. If Er1 or Er2 is 1.0, 1.0006, 2.1, 2.2, 2.33,
       2.5, 3.3, 3.335, 3.7, 4.8, 10.2 or 100, then the  colour  corresponding
       to  that  permittivity  will be set according to the colours defined in
       COLOURS below. If Er1 is not one of those permittivities, the region of
       permittivity  Er1 will be set to the colour 0xCAFF00. If Er2 is not one
       of those values, then the region of the image will be set to the colour
       0xAC82AC.  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_in_rect to print some data to stderr.  Note,
       nothing  extra  goes  to  standard  output,  as  that is expected to be
       redirected to a bitmap file.


       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).
       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 0x0000FF 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)
       L. 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 0x696969 as Er=6.15   (duroid 6006)
       L. gray   240,240,240 or 0xDCDCDC as Er=10.2  (duroid 6010)
       D.  orange  213,160,067  or  0xD5A04D  as  Er=100.0  (mainly  for  test


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

       In the first example, there is just an air dielectric, so  Er1=Er2=1.0.
       The  inner  of  1x1 inches (or mm, miles etc) is placed centrally in an
       outer with dimensions 3 x 3 inches.

       The exact place where the dielectric starts (a) and its width  (d)  are
       unimportant, but they must still be entered.

       % create_bmp_for_rect_in_rect 3 3 1 1 1 1 1 1 > ex1.bmp
       % atlc ex1.bmp

       In  this  second example, an inner of 15.0 mm x 0.5 mm is surrounded by
       an outer with internal dimensions  of  61.5  x  20.1  mm.  There  is  a
       material  with permittivity 2.1 (Er of PTFE) below the inner conductor.
       The output from create_bmp_for_rect_in_rect is sent to a file  ex1.bmp,
       which is then processed by atlc

       %  create_bmp_for_rect_in_rect  61.5  20.1  5  22 0.5 50 15 5 1.0 2.1 >
       % atlc ex2.bmp

       In example 3, the bitmap is made  larger,  to  increase  accuracy,  but
       otherwise    this    is   identical   to   the   second   example.    %
       create_bmp_for_rect_in_rect -b7 61.5 20.1 5 22 0.5 50 15 5  1.0  2.1  >
       % atlc ex3.bmp

       In  the  fourth example, materials with permittivites 2.78 and 7.89 are
       used.    While    there    is    no    change    in    how    to    use
       create_bmp_for_rect_in_rect,  since these permittivities are not known,
       we must tell atlc what they are.  % create_bmp_for_rect_in_rect 61 20 1
       4  22  0.5  50  15  5  2.78  7.89  >  ex5.bmp  % atlc -d CAFF00=2.78 -d
       AC82AC=7.89 ex5.bmp In the sixth and final example, the  -v  option  is
       used     to     print     some    extra    data    to    stderr    from


       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_in_circ(1)      create_bmp_for_stripline_coupler(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

Dr. David Kirkby           atlc-4.5.0 28th Sept create_bmp_for_rect_in_rect(1)