Printed circuit board with protection against electromagnetic interference

摘要

Printed circuit board with protection against electromagnetic interference, comprising a shield housing (1) and a circuit board body (2) which is arranged in an inner center of the shield housing, a lower end of the circuit board body being connected to an inner wall of the shield housing by heat dissipation rods (3), an input terminal (4) is connected to the circuit board body through a left end face of the shield case and an output port (5) is connected to the circuit board body through a right end face of the shield case; wherein the circuit board body includes a first through hole (21), a second through hole (22) and a chip portion (23) between the first through hole and the second through hole; a side wall of the first through hole near the second through hole, a periphery of the chip portion, and a side wall of the second through hole near the first through hole are circumferentially coated with a conductive layer (24); a side wall of the first through hole remote from the second through hole and a left side of the circuit board body are circumferentially coated with a first insulating layer (25); and a side wall of the second through hole remote from the first through hole and a right side of the circuit board body are circumferentially coated with a first insulating layer; wherein electronic chips (6) are respectively arranged at an upper end of the first through hole and an upper end of the second through hole and contact welding shields (7) are respectively arranged at a lower end of the first through hole and a lower end of the second through hole; wherein outer sides of the conductive layer are coated with a second upper insulating layer (8) between the two electronic chips and a second lower insulating layer (9) between the two contact welding shields; and wherein the inner wall of the shielding housing is coated with a layer (11) protecting against electromagnetic interference and a third insulating layer (12) and the layer protecting against electromagnetic interference is arranged between the third insulating layer and the inner wall of the shielding housing.