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Band Pass Filter Simulation

§  To start designing this device, first click on Model   located in your Control Panel.

§  Go to the Options drop down menu, select Units, and set your length to mm.

§  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 5GHz, 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). Choose Dx=0.1, Dy = 0.2473, and Dz = 1.58. (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.

§  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 110x82.

§  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 Mode and:

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.

§  place your first rectangle using the following parameters:

Your Metal Design so far should look like this:

§  You can now add the other rectangles to complete the metal design using the following parameters.

Your overall metal 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 2 ports. To do so, simply click on the port symbol , and then add all the 2 ports at the proper positions between the metals and the ground.  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.  <SPACE> is extremely useful for adding ports by axially rotate the model 90 degree each time)
        o   To delete the port you don't want, just select the specific port from the first row of Component Properties, then press on the toolbar .

Your overall  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 .

§  When it is complete, you can view the Results by clicking on .

§  The 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.

See also