Device for improving shielding effectiveness of an electromagnetic interference enclosure
AssigneeRaytheon Company
InventorSteven Greer Ferguson
Life of this patent
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Abstract
A device for improving the shielding effectiveness of apertures used for mounting electrical component in an enclosure from Electromagnetic Interference (EMI). The device includes a hollow housing which contains and a disc with an aperture, where the disc is attached to an inner surface of the housing to define a first and second inner space. The device also includes a ferrite core which is fit into the second inner space.
Claims20
A device for improving shielding effectiveness of an enclosure from electromagnetic interference (EMI), said device comprising:
- a housing which has an inner surface and an outer surface;
- a disc with an aperture, said disc being attached to said inner surface of said housing to define a first inner space adapted to receive an electrical component and a second inner space;
- and
- a ferrite core with an aperture, said ferrite core being fit into said second inner space wherein said disc aperture is circularly shaped, and a depth of said housing and a diameter of said circular disc aperture are governed by the equation:
- ##EQU9## where SE represents the shielding effectiveness of said housing, t represents the depth of said housing, d represents the diameter of said circular disc aperture, and f represents the frequency of the EMI being shielded.
A device for improving shielding effectiveness of an enclosure from electromagnetic interference (EMI), said device comprising:
- a housing which has an inner surface and an outer surface;
- a disc with an aperture, said disc being attached to said inner surface of said housing to define a first inner space adapted to receive an electrical component and a second inner space;
- and
- a ferrite core with an aperture said ferrite core being fit into said second inner space wherein said disc aperture is rectangularly shaped, and a depth of said housing and a length of said rectangular disc aperture are governed by the equation:
- ##EQU10## where SE represents the shielding effectiveness of said housing, t represents the depth of said housing, d represents a longest side of said rectangular disc aperture, and f represents the frequency of the EMI being shielded.
A device for use with an enclosure having an aperture therein, said shielding device comprising:
- a cylindrical shield having a hollow inner space;
- a cylindrical filter having a hollow inner space;
- a disc having an aperture, said disc being fit into said hollow inner space to define a first inner space and a second inner space wherein, said second inner space is adapted to receive said cylindrical filter wherein said disc aperture is circularly shaped, and a depth of said cylindrical shield and a diameter of said circular disc aperture are governed by the equation:
- ##EQU11## where SE represents the shielding effectiveness of said cylindrical shield, t represents the depth of said cylindrical shield, d represents the diameter of said circular disc aperture, and f represents the frequency of the EMI being shielded.
A device for use with an enclosure having an aperture therein, said shielding device comprising:
- a cylindrical shield having a hollow inner space;
- a cylindrical filter having a hollow inner space;
- a disc having an aperture, said disc being fit into said hollow inner space to define a first inner space and a second inner space wherein, said second inner space is adapted to receive said cylindrical filter wherein said disc aperture is rectangularly shaped, and a depth of said cylindrical shield and a length of said rectangular disc aperture are governed by the equation:
- ##EQU12## where SE represents the shielding effectiveness of said cylindrical shield, t represents the depth of said cylindrical shield, d represents a longest side of said rectangular disc aperture, and f represents the frequency of the EMI being shielded.
A device for improving the electromagnetic interference (EMI) shielding effectiveness of an enclosure having an aperture therein, said device comprising:
- an enclosure having an aperture;
- a housing which has an inner surface and an outer surface;
- a disc with an aperture, said disc being attached to said inner surface of said housing to define a first inner space and a second inner space, said housing being attached to said enclosure such that said first inner space is in alignment with said aperture in said enclosure;
- and
- a ferrite core with an aperture for housing a conductor, said ferrite core being fit into said second inner space wherein said disc aperture is circularly shaped, and a depth of said housing and a diameter of said circular disc aperture are governed by the equation:
- ##EQU13## where SE represents the shielding effectiveness of said housing, t represents the depth of said housing, d represents the diameter of said circular disc aperture, and f represents the frequency of the EMI being shielded.
A device for improving the electromagnetic interference (EMI) shielding effectiveness of an enclosure having an aperture therein, said device comprising:
- an enclosure having an aperture;
- a housing which has an inner surface and an outer surface;
- a disc with an aperture, said disc being attached to said inner surface of said housing to define a first inner space and a second inner space, said housing being attached to said enclosure such that said first inner space is in alignment with said aperture in said enclosure, and
- a ferrite core with an aperture for housing a conductor, said ferrite core being fit into said second inner space wherein said disc aperture is rectangularly shaped, and a depth of said housing and a length of said rectangular disc aperture are governed by the equation:
- ##EQU14## where SE represents the shielding effectiveness of said housing, t represents the depth of said housing, d represents a longest side of said rectangular disc aperture, and f represents the frequency of the EMI being shielded.
Dependencies are inferred from the claim text.