microstrip line
calculate the characteristic impedance and effective dielectric constant of micro-strip lines.
Parameters
dielectric constant
`epsilon_r`
\(\)
height of the substrate
h
\(mil\)
width of the trace
w
\(mil\)
Output
effective dielectric constant `epsilon_(eff)`
`epsilon_(eff)=(epsilon_r+1)/2+(epsilon_r-1)/2[(1+12h/w)^(-1/2)+0.04(1-w/h)^2]]`
characteristic impedance `Z_0`
`60/sqrt(epsilon_(eff))ln(8h/2+w/(4h))`