EMI shielded telecommunications enclosure

Details EMI shielded telecommunications enclosure EMI shielded telecommunications enclosure

1999-07-22

2001-10-16

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

C361S800000, C361S816000, C361S818000, C455S300000

Reexamination Certificate

active

06303854

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an enclosure for telecommunications equipment, and particularly relates to electromagnetic interference (EMI) shielding provided by such an enclosure.
BACKGROUND OF THE INVENTION
Telecommunications services, such as telephony, Internet and cable TV signals, can be distributed among a group of residential or commercial users by way of telecommunications equipment that is housed in an enclosure dedicated to that group of users. Such an enclosure may comprise a metal cabinet resting on a concrete pad. The cabinet has an access opening for installation and service of the telecommunications equipment within the cabinet, and has an access panel for closing the access opening. Since the telecommunications equipment emits and is susceptible to EMI, the cabinet is constructed to provide EMI shielding when the access panel is closed. However, the EMI shielding can be discontinuous across a seam between the access panel and the adjacent edge portion of the cabinet structure around the periphery of the access opening. Therefore, the access panel and the edge portion of the cabinet structure are constricted to adjoin each other in electrically conductive contact. This contact provides a low resistive impedance (LRI) path across the seam so that the EMI shielding is not unduly inhibited by the seam. The electrically conductive contact is established by and between electrically conductive gaskets, electrically conductive tape, and/or electrically conductive paint on the access panel and the cabinet structure.
SUMMARY OF THE INVENTION
In accordance with the present invention, an EMI shielded telecommunications equipment enclosure comprises a metal cabinet structure and an access panel. The cabinet structure defines a compartment configured to contain electrical equipment that emits and is susceptible to EMI. An edge portion of the cabinet structure defines a peripheral boundary of an access opening of the compartment. The access panel includes a metal panel structure. When the access panel is closed, the metal panel structure extends across the access opening and overlies the edge portion of the metal cabinet structure. The apparatus further includes a layer of electrically nonconductive material that is interposed as a dielectric between the metal panel structure and the edge portion of the metal cabinet structure when the access panel is closed. In this configuration, a low capacitive impedance (LCI) path for EMI shielding is provided between the access panel and the metal cabinet structure when the access panel is closed.


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