How to continuously connect the PAC shielded enclosure of the intelligent controller?

To ensure the continuity of the internal shielding compartment of the intelligent controller PAC, low-impedance connections and continuous contact must be used. Conductive gaskets (such as beryllium copper springs or metal mesh) should be continuously arranged around the shielding compartment and the housing, with a gasket compression of 30%-70%, and the mounting surface should be clean and flat. The spacing between fastening screws should be less than λ/20 (less than 15mm at 1GHz), and star washers should be used to reduce contact resistance.

The ground plane of the PCB inside the shielding compartment should be connected to the top of the compartment through multiple metal pillars or conductive foam, with a connection point spacing of less than 50mm. For removable covers, spring contacts or conductive hinges should be used to achieve multi-point contact. After the connection is made, the connection resistance should be less than 10mΩ when measured using the four-terminal method, and the transfer impedance should be measured using a network analyzer. After optimization, the shielding effectiveness of the shielding compartment at 1GHz should be greater than 50dB, meeting the MIL-STD-285 shielding effectiveness standard.