How to control the radiation emitted by a power line carrier PLC?

Controlling power line carrier PLC transmission radiation requires addressing both source suppression and path shielding. Transmit power is dynamically adjusted based on communication distance to avoid excessive radiation. A differential output structure, coupled with a common-mode inductor CML4532A-510T, reduces common-mode radiation. A low-pass filter with a cutoff frequency 1.5 times the carrier frequency is deployed at the transmit output to suppress harmonic radiation. On the PCB layout, the transmitting circuit is positioned away from the board edge and surrounded by a ground plane. A metal shield is used in the enclosure, with conductive pads installed at the gaps. The radiated field strength is predicted through simulation to optimize the design. In actual testing, radiated emission tests were conducted, meeting the EN55032 Class B limits in the 30MHz-1GHz band. Controlling transmission radiation enables the system to pass EMC certification and avoids interference with other equipment.