Band splitting in 2D EBG structure by geometry modulation

The dispersion diagram of a 2D periodic structure built in stripline technology is determined by full-wave simulation. One of the geometrical parameter of the structure is then binary modulated in two orthogonal directions, yielding a new periodic structure with a unit cell that is four times larger with respect to the original one. The calculated dispersion diagram of the latter structure exhibits the phenomenon of band splitting determined by modulation. The newly introduced modes and enriched band contents have potential applications to antenna technology, filtering and dispersion engineering.