Printed-circuit board-mountable ferrite EMI filter

Details Printed-circuit board-mountable ferrite EMI filter Printed-circuit board-mountable ferrite EMI filter

1998-03-27

1999-06-22

Ham, Seungsook

Wave transmission lines and networks

Transmission line inductive or radiation interference...

333181, H03H 709, H04B 328

Patent

active

059146443

ABSTRACT:
A printed circuit (PC) board-mountable ferrite electromagnetic interference (EMI) filter (702, 1003, 1003") for PC conductors (701, 1001, 1002) of a printed circuit (PC) board (700, 1000) that accommodates large numbers of PC conductors, and is cost-effective. One embodiment of the EMI filter is used with a PC board (700) that routes PC conductors (701) in a step-function (i.e., a "U"-shaped) pattern. The EMI filter comprises a ferrite body (702) that defines two parallel passageways (708, 709), i.e., has a figure-8 shape in cross section. The portion (710) of the PC board that defines the PC conductor portions extending in the one direction lies in one passageway, whereas the portion (711) of the PC board that defines the PC conductor portions extending in the other direction lies in the other passageway. A different embodiment of the EMI filter is used with a PC board (1000) that routes sets (1001, 1002) of PC conductors in a cross-hatch (i.e., a "#"-shaped) pattern, where the PC conductors end (are interrupted) before intersecting so that each PC conductor comprises two separate straight on-board parts. This EMI filter comprises a ferrite body (1003) that defines two orthogonal sets (1012, 1013) of off-board "U"-shaped conductors, one set for each orthogonal set of PC conductors with one conductor of a set for each PC conductor of a set. Each PC conductor's corresponding "U"-shaped conductor interconnects the two straight on-board parts of the PC conductor.

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