Microstrip Substrate Equations

You 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.
RF / Microwave PC Board Design and Layout

Effective Width and Height

RF Cafe: Microstrip calculation equation

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