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Ansoft Designer / Ansys Designer 在线帮助文档：

HFSS and Planar EM Simulators >
Using the Estimate Module >
Estimating Transmission Line Quantities >
Estimating Characteristic Impedance

Estimating Characteristic Impedance

Use this command to estimate the characteristic impedance of a microstrip or stripline from the width you specify.

To estimate the characteristic impedance:

1. Select the metal layer on which the microstrip line lies from the list.

If the selected layer is an infinite ground layer, a CPW line is assumed.

2. Click T-Line>Impedance.

Parameter input boxes appear in the right portion of the Estimate module’s window.

3. For trace layers, enter the width of the microstrip line in the Width box. The units for the line width are the same as the current working units.

4. For infinite ground layers, do the following:

a. Type the width of the first line in the Width1 box.

The units for the line width are the same as the current working units.

b. Type the width of the second line in the Width2 box.

c. Type the gap between the two lines in the Gap box.

d. Type the frequency at which to estimate the impedance in the Frequency box.

5. Click Calculate to display the impedance below the data you entered.

The characteristic impedance corresponds to the line width you specified. The units for impedance is ohms.

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