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       find_optimal_dimensions_for_microstrp_coupler  part of atlc.

       find_optimal_dimensions_for_microstrp_coupler [options... ] h t Er1 Er2
       Z Zodd_req Zeve_reg 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	 docu-
       mentation that was current at the time this 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.

       find_optimal_dimensions_for_microstrp_coupler is	part of	the atlc,  CAD
       package	for  the  design and analysis of transmission lines and	direc-
       tional couplers.	While the executable program atlc (as opposed  to  the
       complete	package	atlc) is able to analyse the properties	of directional
       couplers, telling you both the odd and even mode	 impedances  Zodd  and
       Zeven, it is not	able to	design a coupler to have specific odd and even
       mode impedances.	The only way to	use the	program	program	atlc

       The parameters 'W' and 'H' and the inner	dimensions of the  outer  con-
       ductor.	 The  inner conductor has a diameter of	'd' and	is offset from
       the centre of the outer conductor by an amount 'x' horizontally and 'y'
       vertically.   The space between the inner and outer conductors is a di-
       electric	of relative permittivity 'Er'. If there	is just	a  vacuum  di-
       electric, then 'Er' should be set to 1.0

       find_optimal_dimensions_for_microstrp_coupler   d  W  H	x y Er > file-
       name.bmp	OR
       find_optimal_dimensions_for_microstrp_coupler -f	filename.bmp d W H x y

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

       The permittivities of the bitmap, set by	'Er', determine	the colours in
       the bitmap. If Er1 is 1.0, 1.006, 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 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 atlc, must	be told	with the -d command  line  op-
       tion, 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  de-
       fault  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

       Causes find_optimal_dimensions_for_microstrp_coupler to print some data
       to stderr. Note,	nothing	extra goes to standard output, as that is  ex-
       pected 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 lev-
       els  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.
       black  =	000,000,000 or 0x000000	is the negative	conductor

       All bitmaps must	have the live (red) and	 grounded  (green)  conductor.
       The  black 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)
       white	 255,202,202 or	0xFFCACA as Er=1.0006 (air)
       blue	 000,000,255 or	0x0000FF 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 213,160,077 or	0xD5A04D as Er=100   (for testing)
       If the permittivity is one not in the above list, then those  parts  of
       the image with Er1 will be set to 0xCAFF00, and those parts with	Er2 to

       Here are	a few examples of the use  of  find_optimal_dimensions_for_mi-
       crostrp_coupler.	  Again,   see	 the   html   documentation  in	 atlc-
       X.Y.Z/docs/html-docs 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.

       %  find_optimal_dimensions_for_microstrp_coupler	 3  3  1  1  1 1 1 1 >
       % 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 mate-
       rial with permittivity 2.1 (Er of PTFE) below the inner conductor.  The
       output  from find_optimal_dimensions_for_microstrp_coupler is sent to a
       file ex1.bmp, which is then processed by	atlc

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

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

       In the fourth  example,	instead	 of  re-directing  find_optimal_dimen-
       sions_for_microstrp_coupler's  output  to a file	with the > sign, it is
       done using the -f option.
       % find_optimal_dimensions_for_microstrp_coupler -f ex4.bmp 61.5 20.1  5
       22 0.5 50 15 5 1.0 2.1
       % atlc ex4.bmp

       In  the	fifth  example,	materials with permittivites 2.78 and 7.89 are
       used. While there is  no	 change	 in  how  to  use  find_optimal_dimen-
       sions_for_microstrp_coupler,  since these permittivities	are not	known,
       we must tell atlc what  they  are.   %  find_optimal_dimensions_for_mi-
       crostrp_coupler	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 find_opti-

       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)			  cre-
       ate_bmp_for_rect_in_circ(1)     create_bmp_for_rect_in_rect(1)	  cre-
       ate_bmp_for_stripline_coupler(1)		      create_bmp_for_symmetri-
       cal_stripline(1)	design_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	   atlfind_optimal_dimensions_for_microstrp_coupler(1)


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