The filter is a selection device that allows the specific frequency component in the signal to be passed, and other frequency components are greatly attenuated. This selection effect using the filter can be filtered out of the interference noise or perform spectrum analysis. In other words, it is called a filter that can cause a particular frequency component in the signal to pass, and greatly attenuated or suppress other frequency components. Production R \\u0026 D Safety Y1 Capacitor, Y2 Capacitor, Ceramic Capacitor, Multilayer Ceramic Capacitor, Belt Safety Ceramic Capacitors Widely Apply Filter Industry.