please don’t install or uninstall the cell phone jammer privately

Electrical shielding principle is to ensure good grounding conditions, the interference generated by the source of interference in the end made a good conductor shield. Therefore, a good grounding and a good conductor of choice is the electric shield as the shield can play two key factors. The principle of magnetic shielding for interference by the magnetic field shield provides a low reluctance magnetic path, and thus interfere with the magnetic field triage, chose steel, iron, permalloy high permeability of the material and design boxes, shells and other closed-shell magnetic shielding of the body as two key factors. The principle of electromagnetic shielding by the metal shield by absorption and reflection of electromagnetic waves radiated interference source to shield the far-field, that is, while shielding the electric field generated by the field source and the magnetic field component. Install and use the cell phone jammer combining with the practical condition of the field.
As the frequency increases as the wavelength becomes with the shield on the apertures of the size equivalent to a hole leading to shield electromagnetic shielding seam leakage as the most critical control elements.  Vent hole area and maximum class size of a large line of degree, air ventilation hole design is the key to the choice of components and assembly of structural design. Performance in meeting the conditions of ventilation should be used as the shielding screen-efficient ventilation components. Watch the hole and shows the type of hole-hole area and maximum wire size of a large degree, the light shielding design is the key to the choice of materials and assembly of structural design. Connector and chassis joints such seam line area and the maximum degree of size are not large, but at high frequencies lead to the chassis connector contact resistance increases rapidly, making the shielded cable common-mode conducted emissions become larger, often leads to the emergence of excessive emission of radiation equipment, this should be conductive rubber connector conductive pad.If you have not been authorized by manufacturers, please don’t install or uninstall the cell phone jammer privately. In summary, the apertures suppress design features summarized as: a reasonable choice shielding materials; rational design and installation of interconnect structure.