Electromagnetic bandgap structures for printed circuit board EMC

Abstract

This paper investigates the suppression of parallel- plate modes on printed circuit boards via electromagnetic bandgap structures (EBG). We consider planar structures on ground or power planes. Two unit-cell geometries are used to create a 4 x 4 lattice on two simple test boards, where connector ports represent vias. This is compared to a reference test board without these structures. Measured results show that, even with a simple arrangement, it is possible to suppress parallel-plate modes very effectively.