Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1990-01-30
1991-11-05
Picard, Leo P.
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
219 1055D, 174 35MS, H05K 900
Patent
active
050632736
ABSTRACT:
The invention relates to a housing for electrical and/or electronic apparatus, which protects the apparatus against leakage to the outside of information-carrying, electrical and/or magnetic fields and electromagnetic radiation generated by the apparatus, the housing also protects against crosstalk between information-carrying conductors and/or conducting parts, and against undesired influencing of the apparatus by electrical and/or magnetic fields and electromagnetic radiation of external origin.
The housing is constructed of an inner housing portion acting as a Faraday cage, an outer housing portion acting as Faraday cage wholly encasing the inner housing portion, where the housing portions are insulated from one another electrically, a first earth conductor electrically connected to the inner housing portion, and a second earth conductor electrically connected to the outer housing portion, where the earth conductors are situated at a sufficient mutual distance and at a sufficient depth in the ground such that on the one hand effective earthing of both housing portions is ensured and on the other hand crosstalk between both housing portions is absent, and an earthing loop is avoided.
REFERENCES:
patent: 2333532 (1943-11-01), Frakes et al.
patent: 2449313 (1948-09-01), Naef
patent: 3334597 (1967-09-01), Ruskin
patent: 3982058 (1976-09-01), Hill
patent: 4670347 (1987-06-01), Lasik et al.
patent: 4902997 (1990-02-01), Moran
IBM Tech Bulletin, vol. 17, No. 12, pp. 3662-3663, May 1975.
Fokker Special Products b.v.
Ledynh Bot L.
Picard Leo P.
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