![]() This result demonstrates the importance of appropriately selecting the type of components according to the required performance. This change improved the deviation to about 1dB. To improve the 2dB deviation, we changed the components to the GJM03 series chip capacitors and LQP03HQ series chip inductors, which are characterized by lower loss, and conducted a resimulation. You can see that the characteristics are closer to those of the ideal components. The results of the simulation are shown in the graph below. These components are designed to reduce DC components and other losses, and good characteristics are expected. Here, let’s switch to lower loss components, the GJM03 series and LPQHQ03 series. This is a level of concern for the impact on performance in actual applications. In the simulation using the GRM03 series and LQP03TG series, a deviation of about 2dB was confirmed compared to the results using ideal components. This is due to the losses caused by the DC component, parasitic capacitance, and parasitic inductance of the actual components. Red – ideal components, Blue – real componentsĪt first glance, the real components seem to have a larger attenuation and better characteristics, but a closer look at the passband and the second harmonic band shows that the passband is significantly attenuated in the real components. Here are the S21 results of the simulation. In QucsStudio’s circuit diagram, we create filters composed of ideal components and filters composed of real component S parameters. The S parameters can be obtained from Murata Manufacturing Co., Ltd.’s website. These components are standard parts widely used and suitable for the design of general communication equipment. ![]() We used the chip capacitor GRM03 series and chip inductor LQP03TG series. Therefore, this time, we conduct a simulation to derive results closer to the actual circuit using the S parameters of actual components provided by Murata Manufacturing Co., Ltd. Actual components include parasitic inductance and capacitance, so they do not have the same characteristics as the ideal components. The capacitors and inductors callable in QucsStudio’s lumped components are ideal components. Component Optimization and Resimulation.
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