Effective width of microstrip line when width is greater than thickness¶

Under the conditions described below, the effective width of a microstrip line can be calculated from its physical dimension.

Conditions:

The thickness \(h\) of the substrate of the microstrip line should be less than \(2 \pi w\) where \(w\) is the width of the microstrip.

effective_width¶: Effective width (see length) of the microstrip line. See Effective width of microstrip line.

Symbol:: w_eff
Latex:: \(w_\text{eff}\)
Dimension:: length

width¶: Width (see length) of the microstrip line.

Symbol:: w
Latex:: \(w\)
Dimension:: length

thickness¶: thickness of the microstrip line.

Symbol:: t
Latex:: \(t\)
Dimension:: length

substrate_thickness¶: thickness of the substrate.

Symbol:: h
Latex:: \(h\)
Dimension:: length

law¶

w_eff / h = w / h + 1.25 / pi * t / h * (1 + log(2 * h / t))

Latex:: \[\frac{w_\text{eff}}{h} = \frac{w}{h} + \frac{1.25}{\pi} \frac{t}{h} \left(1 + \log \left( 2 \frac{h}{t} \right)\right)\]