How to filter out power frequency noise in a power line carrier PLC?

The key to power line carrier PLC noise filtering lies in designing a dedicated filter circuit for 50/60Hz and its harmonics. At the power input, an LC low-pass filter structure should be used, employing a high-inductance power inductor such as the PWR6045R6R8M0T series combined with a safety-certified X2 capacitor to filter out power line conducted noise. For common-mode power line interference, it is recommended to use the CML4532A-510T common-mode inductor, whose symmetrical winding structure effectively suppresses common-mode current. Simultaneously, a high-Q bandpass filter should be connected in series in the carrier coupling circuit, with its center frequency set in the carrier band. For example, a CMZ2012A-900T can be used as the coupling inductor, along with a precisely tuned resonant capacitor, to form a frequency-selective path for the carrier signal, thereby attenuating power line noise by more than 40dB and ensuring carrier communication quality.