The user-defined filter is a function to create a virtual component by combining several components. For example, by connecting chip beads in series or connecting capacitors in parallel, their impedance characteristics can be confirmed. In addition, by creating an LC filter using an inductor and capacitor, S-parameter characteristics such as return loss or insertion loss can also be checked. The image above shows how to check impedance characteristics when three MLCCs are connected in parallel. First Select the Tool-User-defined Filter button in the Simulation/Tool tab. Next, Open the Parallel Connection tab, select capacitors to be combined from the Product List, and click the Apply button. Finally, enter an output name and comment, and click the Create button.