International Business Machines Corporation

John Stephen Maas

Don Alan Gilliland

Samuel R Connor

James L Peacock

Edward Charles Gillard

Bruce Roy Archambeault

Scott Marvin Thorvilson

Eric N Chikando

Timothy Paul Duncan

An apparatus for distributing electromagnetic waves comprising a first plurality of plates coupled to a first rod. A second plurality of plates coupled to a second rod, wherein at least one of either the first or the second plurality of plates is capable of reflecting an electromagnetic wave. A portion of the second rod is situated inside the first rod. A first motor mechanically connected to the first rod, such that the first motor is capable of rotating the first rod. A second motor mechanically connected to the second rod, such that the second motor is capable of rotating the second rod, wherein rotational direction and speed of the second rod, when rotated by the second motor is independent of rotational direction and speed of the first rod, when rotated by the first motor.

Electromagnetic interference mode stirrer

A heatsink including an electromagnetic bandgap structure reduces electromagnetic interference caused by an integrated circuit in an electronic device. One embodiment provides a heatsink having a base with an array of electrically-conductive, thermally-conductive patches spaced apart in two dimensions of a reference plane and having a thickness perpendicular to the reference plane. The patches are interconnected by a plurality of branches. Each branch connects adjacent patches and has a width in the reference plane of less than a width of each adjacent patch. A plurality of thermally conductive cooling fins coupled to a surface of the base and extend normal to the reference plane. The cooling fins may be formed of a thermally-conductive, electrically non-conductive material or may be coupled to the base by a thermally-conductive, electrically non-conductive material. The periodically patterned structure of the base, together with a solid metal layer of a circuit board, form an electromagnetic bandgap structure that reduces certain frequencies of electromagnetic noise caused by the integrated circuit.

Heatsink with periodically patterned baseplate structure

An electromagnetic interference shielding arrangement, includes a duplex optical transceiver having a light-emitter and a light-receiver disposed adjacent to each other and at an end of the optical transceiver. A first electromagnetic interference shield covers a major portion of the optical transceiver. A tailstock has an aperture disposed in alignment with the end of the optical transceiver. A second electromagnetic interference shield is positionable to shield the end of the optical transceiver. The second electromagnetic interference shield includes a pipe formed from a conductive material. The pipe has two opposing openings, and an axis extending from one of the openings to the other of the openings. The pipe has a profile that corresponds to a profile of the end of the optical transceiver. A septum is attached to the pipe. The septum is formed from a conductive material. The septum is arranged to extend in a direction that is at an angle to the axis.

Enhanced electromagnetic interference shield

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Kasson, MN, United States of America

John Stephen Maas