Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1986-06-05
1987-10-27
Grimley,, Arthur
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
361424, H05K 900
Patent
active
047031336
ABSTRACT:
An electromagnetic shield for shielding against electromagnetic interference in a manner similar to a solid metal shield having a thickness of several skin depths. In all of the disclosed embodiments, a plurality of electrically-conductive closed rings or loops are arranged in a predetermined relationship, to conduct current inducted by electromagnetic energy received from an exterior interference source or an interior signal source. The special ring or loop configuration causes the induced current to concentrate in the portions of the rings closest to a surface adjacent to the source of the electromagnetic energy, to enhance the shielding. One set of embodiments is suitable for use in a sheet material for housings or enclosures, while another set is suitable for use in the joints between mating coaxial conductors or between adjacent sheets of metal. Still another embodiment is suitable for use as a flexible or rigid cable shield.
REFERENCES:
patent: 3502784 (1970-03-01), Kunkel
patent: 3505463 (1970-04-01), McAdams
patent: 3739076 (1973-06-01), Schwartz
patent: 4033654 (1977-07-01), Ross
patent: 4131329 (1978-12-01), Flatt
patent: 4239318 (1980-12-01), Schwartz
patent: 4441780 (1984-04-01), Walters
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Transfer Impedance Approach to EMP Cable Shield Testing, J. S. Miller, Los Angeles Division, Rockwell International, 10/19/77.
Grimley Arthur
Tone David A.
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