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Ansoft Designer / Ansys Designer 在线帮助文档：

HFSS and Planar EM Simulators >
Using the Estimate Module >
   Estimating Matches Between Impedances >
       Estimating Quarter-Wave Transformer Dimensions           


Estimating Quarter-Wave Transformer Dimensions

Use the Impedance Match>Quarter-Wave command to estimate the dimensions of a quarter-wave section to match a load impedance to an input impedance.

Before using this command, keep the following in mind:

• The numbers computed by this command are for the selected layer and are rough estimates only. Depending on the substrate parameters, the dimensions of the quarter-wave transformer most likely will be different for metals on different layers; therefore, it is important that you select the desired metal layer first.

• The values estimated by this command may not agree exactly with the values computed by the simulation engine. This command is meant to help you obtain a first iteration design. If you are designing a quarter-wave transformer, you can use the rough dimensions provided as a starting point. Once you have these, you can draw and simulate the structure, then fine-tune the design.

To estimate a quarter-wave transformer:

1. Select the trace layer on which the quarter-wave transformer lies.

2. Click Impedance Match>Quarter-Wave. Estimate parameters appear in the right portion of the Estimate window.

3. Type the desired load impedance in the Load Impedance box, in ohms. The number you enter must be real and greater than 0.

4. Type the input impedance in the Input Impedance box. The number you enter must be real and greater than 0. The unit for impedance is ohms.

5. Type the frequency in the Frequency box, in GHz. This frequency is independent of the maximum frequency entered in the solution setup.

6. Click Calculate to perform the estimate. The estimated information appears in the following boxes:

[spacer]

Impedance

Displays the impedance required to match the input impedance to the load impedance. The unit for impedance is ohms.

Width

Displays the line width of the quarter-wave section in the current working units.

Length

Displays the line length of the quarter-wave section in the current working units.


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