PCB microstrip dielectric losses - QuickField simulation example
This is an example of the microstrip line simulation, performed with QuickField software.
How to calculate dielectric losses in the FR4 board?
Answer Typical applications Geometry
Given
Task
Solution
Result
Engineering question
Represent the FR4 dielectric loss using an effective conductivity, solve the AC-conduction model, and integrate the resulting Joule losses in the board.
PCB dielectric substrates, microwave PCB laminates, high-frequency PCB materials
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Simulation problem
Problem Type
Plane-parallel problem of AC conduction.
Trace potential V = 2 V.
Loss tangent tan(δ) = 0.018.
AC frequency f = 100 MHz.
Line length Lz = 1 inch.
Determine dielectric losses in the FR4 board.
To calculate losses we specify effective conductivity of the board to be
γ = 2πf*ε*tan(δ).
QuickField calculates AC electric current density distribution and the Joule losses in the board.
Effective conductivity of the board is 0.43 mS/m.
Joule losses in the board 29 uW (per 1 inch)
AC (effective) current density distribution in the board
Video
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