Patent ID: 8289099

Claim:
An electromagnetic bandgap structure comprising: a plurality of first conductive plates, placed on a first planar surface, the plurality of first conductive plates being lined up in a first direction; a plurality of second conductive plates, placed on a second planar surface and arranged at an area corresponding to an area in which the first conductive plates are disposed, the plurality of second conductive plates being lined up in the first direction; a first stitching via, configured to electrically connect any two adjacent conductive portions with each other, the two adjacent conductive portions lined up in a direction that is different from the first direction on the first planar surface by having a part of the first stitching via pass through a planar surface that is different from the first planar surface, wherein the two adjacent conductive portions placed on the first planar surface includes at least one of the plurality of first conductive plates; and a second stitching via, configured to electrically connect any two adjacent conductive portions with each other, the two adjacent conductive portions lined up in a direction that is different from the first direction on the second planar surface by having a part of the second stitching via pass through a planar surface that is different from the second planar surface, wherein the two adjacent conductive portions placed on the second planar surface includes at least one of the plurality of second conductive plates.