Defected ground structure to minimize emi radiation
AssigneeHewlett Packard Enterprise Development LP
InventorsKarl J. Bois, Benjamin Toby
Life of this patent
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Abstract
A multiple-layer circuit board has a signaling layer, an exterior layer, and a ground layer. A pair of differential signal lines implemented as strip lines are within the signaling layer, and propagate electromagnetic interference (EMI) along the signaling layer. An element conductively extends inwards from the exterior layer, and as an antenna radiates the EMI propagated by the strip lines along the signaling layer outwards from the circuit board. A defected ground structure within the ground layer has a size, shape, and a location in relation to the element to suppress the EMI propagated by the strip lines to minimize the EMI that the element radiates outwards as the antenna.
Claims15
An apparatus comprising:
- a multiple-layer circuit board having a signaling layer, an exterior layer, and a ground layer;
- a pair of differential signal lines implemented as strip lines within the signaling layer, which propagate electromagnetic interference (EMI) along the signaling layer;
- an element conductively extending inwards from the exterior layer, which as an antenna radiates the EMI propagated by the strip lines along the signaling layer outwards from the circuit board;
- and
- a defected ground structure within the ground layer and having a size, shape, and location in relation to the element to suppress the EMI propagated by the strip lines to minimize the EMI that the element radiates outwards as the antenna.
A method comprising:
- fabricating an inner signaling layer of the circuit board to include a pair of differential signal lines that convey electromagnetic interference (EMI) along the inner signaling layer;
- forming an element conductively extending into the circuit board from an exterior layer of the circuit board, the element emitting the EMI conveyed along the inner signaling layer outwards from the circuit board;
- and
- fabricating a ground layer of a multiple-layer circuit board to include a defected ground structure having a size, shape, and location in relation to the element to contain the EMI within the circuit board to reduce the EMI that the element emits outwards from the circuit board.
A circuit board comprising:
- a signaling layer including a pair of strip lines that propagate electromagnetic interference (EMI);
- an exterior layer from which an effective antenna extends inwards towards the signaling layer, the effective antenna radiating the EMI propagated by the strip lines outwards from the circuit board;
- and
- a ground plane having a defected ground structure that has a size, shape, and location relative to the effective antenna to suppress the EMI propagated by the strip lines to reduce the EMI that the effective antenna radiates outwards.
Dependencies are inferred from the claim text.