How can EPS wireless modules reduce radiation interference?

The wireless modules integrated within the EPS (such as Wi-Fi and 4G) are both potential sources of radiated interference and may be affected by internal noise. Interference reduction measures include:

1. Module selection and certification: Select modules that have passed radio type approval (SRRC, etc.) and EMC certification.

2. Spatial isolation: Place the wireless module on the PCB away from power switching devices and traces, preferably on the board edge or a separate small board.

3. Shielding: Install a metal shielding cover on the wireless module and ground it to suppress its own radiation and prevent external interference.

4. Power supply filtering: Thoroughly filter the power supply of the wireless module using a π-type filter (such as ferrite beads + capacitors) to prevent power supply noise from affecting module operation or radiating through the antenna.

5. Antenna placement and feeder: The antenna should be kept away from metal cabinets or externally mounted through openings; the feeder should use coaxial cable and be properly grounded.

6. Software-controlled transmission power: While meeting communication requirements, appropriately reduce the transmission power through software.