PCB microstrip line capacitance - QuickField simulation example
This is an example of the microstrip line simulation, performed with QuickField software.
How to find microstrip transmission line capacitance?
Answer Typical applications Geometry
Given
Task
Solution
Result
Engineering question
Set up a plane-parallel QuickField Electrostatics problem for a PCB microstrip line and evaluate capacitance from computed field results.
PCB microstrip traces, microwave PCB traces, planar transmission lines
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Simulation problem
Problem Type
Plane-parallel problem of electrostatics.
Relative permittivity of air ε = 1;
Relative permittivity of substrate ε = 10.
Shield is grounded U = 0 V.
Determine the capacitance of the microstrip transmission line.
The capacitance is the ratio of stored electric charge to potential difference between the strip and the shield. We apply electric potential of 1V to the strip.
Microstrip capacitance is 1.77e-10 [C] / 1 [V] = 0.177 [nF] per 1 meter of strip line length.
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