Wave transmission lines and networks – Transmission line inductive or radiation interference...
Patent
1992-07-15
1994-02-15
Gensler, Paul
Wave transmission lines and networks
Transmission line inductive or radiation interference...
333185, 333181, 336 92, 336175, H03H 701
Patent
active
052870740
ABSTRACT:
An apparatus for providing electromagnetic shielding. A wire for carrying an electrical signal is shielded with a first cylindrical ferrite shield by passing the wire through its central passage. The first ferrite shield has magnetic characteristics which provide attenuation of electrical noise over a first particular frequency band. A second cylindrical ferrite shield is situated adjacent the first shield with the wire passing through its central passage. The second ferrite shield has magnetic characteristics which provide attenuation of electrical noise over a second particular frequency band. A plastic package surrounds the first and second ferrite shields, and holds the first and second shields end to end in fixed proximity to one another. The plastic package includes a pair of half-cylindrical package sections having a joined edge and two open edges with a hinge portion joining the pair of package sections at the joined edge. A pair of latches, each including a hole, are situated at one of the open edges. A pair of recessed portions with hooks are aligned with the latches and engage the latches when the half-cylindrical sections are rotated to a closed position to form the cylindrical shape. A plurality of projections are situated at the open ends of the package sections and adjacent an end of each of the first and second ferrite shields. These projections project toward a central area of the package when in the closed position to retain the first and second half-cylindrical portions of the first and second ferrite shields within the plastic package.
REFERENCES:
patent: 4146854 (1979-03-01), Ishino et al.
patent: 4656451 (1987-04-01), Pomponio
patent: 4972167 (1990-11-01), Fujioka
Maeshima Yasuhito
Meguro Toshiaki
Nishikawa Katuhiko
Gensler Paul
Miller Jerry A.
Musacchio Pasquale
Sony Corporation
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