1)Microstrip Impedance – Single-ended
W = Width of the trace
H = Height of dielectric above the return plane
T = Trace thickness
Er = Relative permittivity of the dielectric
2)Microstrip Impedance – Differential
W = Width of the trace
H = Height of dielectric above the return plane
T = Trace thickness
S = Space between traces
Er = Relative permittivity of the dielectric
For microstrip traces, a solid ground plane is needed under the signal traces. The ground plane helps keep the EMI localized and the trace impedance continuous. Since stripline traces are typically sandwiched between the ground and supply planes, they have the advantage of lower EMI radiation and less noise coupling. The tradeoff of using strip line is a lower propagation speed.
3)Stripline Impedance – Single-ended
W = Width of the trace
H = Height of the dielectric above the return plane
T = Trace thickness
Er = Relative permittivity of the dielectric
4)Stripline Impedance – Differential
W = Width of the trace
H = Height of the dielectric above the return plane
T = Trace thickness
S = Space between traces
Er = Relative permittivity of the dielectric
