How should the interface window of the intelligent controller PAC be designed?

The design of shielding for the PAC interface windows (such as areas with concentrated USB, Ethernet, and serial ports) of the intelligent controller requires the use of connectors with shielded shells and shielding baffles. Each connector should be a metal-shell model, with the shell overlapping the housing 360 degrees using spring contacts or conductive foam. A metal shielding baffle should be installed on the interface window, with the baffle opening matching the connector and conductive gaskets used on the contact surface. The baffle should be fastened to the housing with multiple screws, with a screw spacing of less than λ/20.

For non-metallic connectors (such as plastic USB), metal spring contacts or conductive cloth should be installed at the opening to cover it. At the same time, a shielding compartment should be set behind the interface to surround the interface circuit and connect it to the housing. Tests show that this design can achieve a shielding effectiveness of more than 30dB for the interface window at 1GHz and reduce radiated emissions by 12dB, meeting the IEC61000-4-3 radiated emission test requirements.