High frequency EMI shield with air flow for electronic device en

Details High frequency EMI shield with air flow for electronic device en High frequency EMI shield with air flow for electronic device en

1996-11-15

2000-01-25

Ramirez, Nestor

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

H02K 900

Patent

active

060181257

ABSTRACT:
An EMI shielded enclosure has a plurality of electrically conductive walls. The conductive walls are electrically connected so electromagnetic radiation from within the enclosure cannot radiate through the walls. An EMI shield plate, that makes up at least one wall of the enclosure, is an electrically non-conductive, plastic wall with tunnel holes through the wall. The holes provide for air flow into and out of the enclosure. A conductive coating on the non conductive wall and the holes converts the non-conductive plastic wall into a conductive wall with waveguide attenuating. The waveguide attenuating holes, when so coated with the conductive layer, attenuate electromagnetic radiation passing from inside the enclosure through said holes to outside the enclosure. The waveguide attenuating holes effectively attenuate electromagnetic radiation at frequencies up to 5 gigahertz.

REFERENCES:
patent: 4663240 (1987-05-01), Hajdu et al.
patent: 4879434 (1989-11-01), Assel et al.
patent: 5431974 (1995-07-01), Pierce
patent: 5576513 (1996-11-01), Gunther et al.

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