Dual Stripline Trace Calculations - National Instruments Graphical User Interface Ultiboard User Manual

Chapter 6 PCB Calculators

Dual Stripline Trace Calculations

NI Ultiboard User Manual
Assymetric Stripline Equations
The equations used to perform the asymmetric stripline calculations are:
Z0 =
(1-H/(4*H1))*80*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 centered stripline trace
calculations:
1. Select Tools»PCB Transmission Line Calculator.
2. Select Dual Stripline in the Type drop-down list.
3. In the Input Data area, edit the following fields as desired:
• Input Length Unit
• Trace Separation (C)—Refer to the figure below.
• Dielectric Thickness (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.
Select mils or millimeters.
—
6-6 ni.com