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DXF Import Example for a Matching Network
§ To start designing this device, first click on Model located in your Control Panel.
§ Then, go to the Options drop down menu and select Settings.
§ Make sure you have a metal at the bottom of your substrate by selecting Yes for Metal at Bottom, and set your Frequency Range from 1 to 120GHz, and the frequency sweep is set to be 0.5GHz, then press OK.
§ Turn off the radiation feature by selecting No for Radiation.
§ Set Dy=20, and the Dx and Dz can be adjusted after the importation of DXF section. (Tip: for faster simulations, Dx, Dy and Dz may be ste as close as possible to MAX, which can be achieved by increasing/decreasing the maximum frequency range in the Options->Settings)
§ You can also set proper bridge depth (if applicable), line width and mesh density in Settings window, which will help the software generating a proper initial mesh.
o mesh density is in cells/wavelength, the wavelength here is the minimum one associated with the upper limit of the simulation frequency range.
§ To import the DXF section, first click on the icon , then click to open the DXF file you want to import, and the DXF file will be opened in a new sub-window as:
§ Hold the right-mouse bottom while dragging a square to enclose a section in the DXF file. You can cancel selections and redo selections as much as you want until you are satisfied with selection. The selected DXF part in shown in red, which was imported in this specific case.
§ You can import the section on either top or bottom layer, and the tool will lead you to the metal designer automatically after the importation.
o You can delete any imported shapes if needed, and when satisfied Group all shapes together using "Group DXF Shapes" icon, then expand the size of the shapes to approximate the fan shape more precisely.
o Use your mouse to click, drag and resize your shapes, or just clicking on the metal shape and using your arrow keys to position it.
To get out of Edit Mode, simply click on the icon again, and then click on "Accept DXF Shapes" and "Save & Close window" to get out of the metal designer mode.
§ You need to re-size your grid and rotate your DXF shape by 90 degrees by typing “90” on the degree rotation property of the DXF shape. After accepting your dxf shape, you can add two square pieces of metals at the input and output ports to complete your design. (Hint: Only after accepting the DXF shape, users are allowed to add other shapes to the DXF sections. Also, users are allowed to imports different shapes on several layers).
Finally, your 2D design would look like:
§ To finalize your design, you will now need to add port. To do so, simply click on the port symbol , and then add the port to your metal. When you are done adding your port, press Esc on your keyboard. (Tip: Remeber to use the View functions such as Pan and Rotate to have a better visual of the port area)
The overall design would be like this:
§ Now you are ready to start running the simulation by clicking on the Simulation button .
§ When it is completed, you can view the Results by clicking on .
§ When you first open up your Results window, the two graphs should look blank.
§ To start viewing the graph results, click on the desired Port File located in the S-Parameter and Smith Chart Control Panels.
§ The curves of S11 and S21 are shown below:
§ You can set the exact specifications of your graph by changing the Range in your S-Parameter and Smith Chart Control Panels.
It can be seen that the matching network works well below 50 GHz.