Greetings: There is so much good stuff on RF Cafe that there is no way to list or
link to all of it here. Please use the Search box or the Site
Map to find what you want - there is a good chance I have it. Thanks!
can work these formulas manually, or download this great free microstrip calculator (TX
Line) from AWR.
Equations are given for calculating the effective width and height
prior to plugging the dimensions prior to plugging them in to the equations for effective dielectric
constant and then for calculating the impedance.
Here is a really nice summary of many
controlled impedance line equations, by Rick Hartley.
Be aware that there are many microstrip
impedance calculators on the Internet that give sometimes widely varying results. Be sure of
which one you finally decide to use. Most claim to use some or all of these formulas these formulas,
but I have discovered ones, for instance, that appear to mistakenly substitute 0.4 for 0.04
in the εeff formula for the W/H<1 case.