Home > Examples > 4-Port Coupler Simulation
4-Port Coupler Simulation
§ 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 20GHz, then press OK.
§ You can make all your necessary changes to Dx, Dy, and Dz in the Control Panel. Keep in mind, however, that these values need to be lower than the Max value posted above (with Max being a function of the dielectric constant, the frequency range, and the mesh density). Set Dx=0.4064, Dy=0.265, Dz=0.4233. (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)
o You can also set proper bridge depth (if applicable), line width and mesh density in Settings, 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.
§ Go to Chip Designer by clicking on the icon. You can now start editing your metal in 2D.
§ Click on the Edit drop down menu and select Change Grid Dimensions. Set the dimensions to 80x100.
§ To start editing your metal design shape, first click on the Draw Rectangle icon, then click and drag to form your first rectangular shape. You can edit your metal shapes’ dimensions and location by Going to Edit Modeand:
o Using your mouse to click, drag and resize your shapes, or just clicking on the metal shape and using your arrow keys to position it.
o Or you can just click on the desired shape, and manually enter its exact dimensions and location in the Properties panel located on the right.
To get out of Edit Mode, simply click on the icon again.
§ Set the properties of your first rectangle to:
Your Metal Design so far should look like this:
§ You can now add the 3 other identical rectangles, by simply duplicating this shape. To do so, go to Edit Mode, click on the shape you wish to duplicate, and either click on the duplicate icon , or press ctrl+d on your keyboard.
§ Once your 4 rectangles are in place, with the top and bottom right triangles set at a Centre x=44, your Metal design should look like this:
§ You will now need to add the 2 horizontal bars with the following dimensions:
Make sure to line them up so your overall design looks like this:
§ You now need to add the last 2 vertical bars with the following dimensions:
When these 2 metal rectangles are in place, the overall design should look like this:
§ Now that you have your metal designed, click on to get out of the Chip Designer mode.
§ To finalize your design, you will now need to add the 4 ports. To do so, simply click on the port symbol, and then add all the 4 ports to your metal. When you are done adding your ports, press Esc on your keyboard.
(Tip: Remember to use the View functions such as Pan and Rotate to have a better visual of the port area)
Your overall final design should look like this:
§ Now that you are done with your design, you can start running the simulation by clicking on the Simulation button .
§ The Simulation should take about 10 minutes. When it is complete, 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. If you would like to view multiple port files in one graph, simply click on all the desired port files while holding the Ctrl key on your keyboard.
Here’s an example of the S-Parameter graph:
§ You can set the exact specifications of your graph by changing the Range in your S-Parameter and Smith Chart Control Panels.