In recent years, with the popularization of the advanced driving assistance system (adas), which promotes the automatic driving, in order to monitor the circumstances around the car, many cars have a large number of hd car cameras installed. at the same time, the number of cables used also increases such that the demand for the poc mode that can transmit signals and power supplies can be increased by the same cable. the poc mode can be separated from the signal and power, so a wide frequency high impedance filter is typically formed by a plurality of inductors.