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ASME's Mechanical Engine…ing Toolkit 1997 December
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ASME's Mechanical Engineering Toolkit 1997 December.iso
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MSTRIP.DOC
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1980-01-01
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MSTRIP.* - This program allows the user to enter
data measured from a piece of double-sided copper-clad PC
board (ie. capacitance measured between the two sides and
physical dimensions). Using this data, the program computes
an effective permitivity for the dielectric. The user can
then go into another section of the program and find widths
of microstrip lines of given impedences using the entered and
computed data.
The equations used in this program were taken from
"Synthesize and Analyze Microstrip Lines", Microwaves and RF
magazine, Jan 1985, pgs. 111-116 and the book Physics
by Halliday and Resnick. Other articles also discuss this
technique of finding the relative permitivity.
The scenerio for use is: an engineer wants to do some
design work involving microstrip. He obtains a rectangular
piece of double-sided copper-clad circuit board, hopefully
labelled with the appropriate design data needed (relative
permittivity, dielectric thickness, etc). In any case, the
engineer measures the capacitance between the two plates,
then takes measurements of the physical size and dielectric
thickness of the board. Entering the appropriate data when
prompted, this program will generate a value for the relative
permittivity of the dielectric. The operator can use this
data in the same program to design microstrip lines of
various characteristic impedences.