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50r pcb stripline width??



 
 
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  #1  
Old November 24th 03, 07:53 PM
zindazenda
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Default 50r pcb stripline width??

ok..i know the width of track for 50r pcb stripline using standard 1/16in
fibreglass pcb is 2.8mm but howabout 1/8in pcb???
or does anyone have programe that works this out? (for dos/windows .)
reason for asking making high power swr meter and i have a large sheet of
1/8 in pcb i need to use....

g0zen.
simon


  #2  
Old August 11th 10, 01:48 PM
vk5ajl vk5ajl is offline
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First recorded activity by RadioBanter: Aug 2010
Location: South Australia
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Stripline has a ground plane on both sides. Microstripline only one.
For microstripline:-

Z0 = √L/C = 377 x (t/w) x Er^-0.5

t is thickness of board, w is width of strip and Er is relative dielectric constant of material which for most PCB is between 4 and 5. I use 4.5.
50 ohm stripline is certainly about 2.8mm but micro-stripline, ie. one side of a PCB, is 6mm for about 47 ohms.
Because t/w is a ratio, you can use mm, inches or cubits if you want.
In any case, because SWR pickups are such a small percentage of a wavelength, (good readings can be obtained from 1/40 wavelength), the values are simply not critical. Plugs, sockets and solder will probably have a much greater effect.

Last edited by vk5ajl : August 11th 10 at 01:52 PM. Reason: Forgot something.
 




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