The higher power filter insertion loss better? Series filter network better? In fact, this is not the right way to filter choice. In addition, the more filtering network series, the more expensive price, the greater the volume and weight. In fact, the only way to select and evaluate power line filter is to be loaded into the device for testing. As mentioned above, the filter, the performance of the device depends largely on the load impedance. And not from a single impedance (50Ω) to derive data insertion loss, it is a complex function of the filter element and the impedance of the impedance of the device, its magnitude and phase changes in the frequency range. Select the desired filter test conducted emission control (FCC, VDE) and sensitivity control different levels of performance on the device.