Compliant shaped EMI shield
AssigneeLaird Technologies, Inc.
InventorWilliam Stickney
Life of this patent
Estimating the term…
Abstract
Disclosed are devices for shielding one or more connection ports from electromagnetic interference emissions. In one embodiment, the device includes a conformal member having a proximal aperture, a distal aperture, and a channel extending therethrough. The distal aperture has a maximum cross-sectional dimension that is less than about one half of a cutoff wavelength, thereby forming a waveguide for attenuating EMI signals that have a wavelength greater than a predetermined cutoff wavelength. In another embodiment, the conformable member includes first conformable element and a second conformable element. The conformable elements, when mated, form a proximal aperture, a distal aperture, and a channel extending therethrough having substantially the dimensional characteristics described above.
Claims29
An apparatus for reducing a transfer of electromagnetic interference (EMI) across a conductive boundary defining an aperture in a structure, the apparatus comprising:
- a conformable member comprising:
- a conductive external surface along at least a portion thereof, the conductive external surface being in electrical communication with a conductive boundary defining an aperture in a structure when installed therein;
- and
- a first conductive channel defined by the conformable member extending therethrough, the first conductive channel having a predetermined minimum length, being adapted for receiving at least a portion of a cable assembly, and being in electrical communication with the conductive external surface, the first conductive channel forming:
- a first aperture at a proximal end of the channel;
- and
- a second aperture at a distal end of the channel, the second aperture having a predetermined maximum cross-sectional dimension less than about one half of a predetermined cut-off wavelength, wherein the maximum cross-sectional dimension and the minimum length determine an attenuation value relating to the transfer of EMI therethrough.
A method for reducing a transfer of electromagnetic interference (EMI) across a conductive boundary defining an aperture in a structure, the apparatus comprising:
- providing a conformable member comprising:
- a conductive external surface along at least a portion thereof, the conductive external surface being in electrical communication with a conductive boundary defining an aperture in a structure when installed therein;
- and
- a first conductive channel defined by the conformable member extending therethrough, the first conductive channel having a predetermined minimum length, being adapted for receiving at least a portion of a cable assembly, and being in electrical communication with the conductive external surface, the first conductive channel forming:
- a first aperture at a proximal end of the channel;
- and
- a second aperture at a distal end of the channel, the second aperture having a predetermined maximum cross-sectional dimension less than about one half of a predetermined cut-off wavelength, wherein the maximum cross-sectional dimension and the minimum length of the first conductive channel determine an attenuation value relating to the transfer of EMI therethrough;
- and
- installing the conformable member in the structure.
A device for shielding EMI, the device comprising:
- a conductive element forming an aperture adapted to receive a cable, the conductive element, comprising:
- a first end including a conductive gasket adapted to contact a support structure;
- and
- a second end including a conductive gasket adapted to contact a circuit board;
- and
- a conformable element positioned partially within the aperture and adapted to receive the cable, the conformable element forming a channel extending therethrough and forming a waveguide having an aperture with a maximum cross-sectional dimension less than about one half of a predetermined cut-off wavelength, wherein the waveguide attenuates EMI signals having a wavelength greater than the cut-off wavelength.
Dependencies are inferred from the claim text.