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The most common types of networks used in EMI/RFI filters are LC (inductor-capacitor) and RC (resistor-capacitor) networks, which help in attenuating unwanted frequencies while allowing desired signals to pass through.
To select the appropriate EMI/RFI filter, consider factors such as the frequency range of the interference, the required attenuation level, the type of signals being processed, and the specific application environment to ensure compatibility and effectiveness.