Microstrip crossover - QuickField simulation example
Mutual capacitance between crossing microstrip traces, quantifying the parasitic capacitive coupling that contributes to high-frequency crosstalk.
How to calculate mutual capacitance in a microstrip crossover?
Answer Typical applications Geometry 3D extrusion.
Equivalent electric circuit:
Given
Task
Solution QuickField simulation gives charge q distribution. The capacitance then can be calculated as C = q / (U2 - U1).
ResultsEngineering question
Apply opposite potentials to the crossing traces in a 3D electrostatic model and determine their mutual capacitance from the calculated charge.
PCB microstrip crossovers, multilayer PCB crossings, signal routing crossovers
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Simulation problem
Problem Type electrostatics.
Relative permittivity of air ε = 1,
Relative permittivity of substrate ε = 10,
Strip1 potential U1 = -0.5 V,
Strip2 potential U2 = +0.5 V.
Find the mutual capacitance between strips C12.
To find the mutual capacitances C12 we should switch off all voltage sources and apply opposite potentials on stip1 and stip2.
The measured charge q = 1.76e-12 C.
The capacitance is C12 = 1.76e-12 / (0.5 - (-0.5)) = 1.76e-12 F.
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