microstrip line width
calculate the width of the trace for micro-strip lines according to the characteristic impedance.
Parameters
characteristic impedance
`Z_0`
\(\Omega\)
dielectric constant
`epsilon_r`
\(\)
height of the substrate
h
\(mil\)
Output
factor A
ratio A
`w/h=(8e^A)/(e^(2A)-2)`
factor B
`60pi^2/(Z_0 sqrt(epsilon_r))`
ratio B
`W/h=2/pi{B-1-ln(2B-1)+(epsilon_r-1)/(2epsilon_r)[ln(B-1)+0.39-0.61/epsilon_r]}`
width w
`ra(ra<=2)+rb(rb>2)`
w in mm
`1mil=0.0254mm'