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Asymmetric Stripline Trace Calculations
© National Instruments Corporation
Centered Stripline Equations
The equations used to perform the centered stripline calculations are:
Z0 = 60*ln(4*(2*H+T)/(0.67*3.1415926*(0.8*W+T)))/sqrt(Er)
Tpd = 84.66667*sqrt(Er)
C0 = Tpd/Z0
L0 = C0*Z0*Z0
Complete the following steps to perform asymmetric stripline trace
calculations:
1.
Select Tools»PCB Transmission Line Calculator.
2.
Select Asymmetric Stripline in the Type drop-down list.
3.
In the Input Data area, edit the following fields as desired:
•
Input Length Unit—Select mils or millimeters.
•
Dielectric Height (H1)—Refer to the figure below.
•
Dielectric Height (H)—Refer to the figure below.
•
Trace Thickness (T)—Refer to the figure below.
•
Trace Width (W)—Refer to the figure below.
•
Relative Permittivity (epsilon r)—Refer to the figure below.
4.
Click Calculate. Results of the calculation appear in the Calculation
Results area. They also appear in the Results tab of the Spreadsheet
View.
5.
Click Close to close the PCB Transmission Line Calculator.
6-5
Chapter 6
PCB Calculators
NI Ultiboard User Manual
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