Controlling the band-gap of a High Impedance Surface of quasi-periodic sequences using cascade arrangement

Control of the dispersion characteristic, mainly in the position of the band-gap, of a novel type of printed microstrip High Impedance Surface (HIS) is presented. The HIS consists of a periodic arrangement of macro unit cells, which in turn are formed by sequential arrangement of similar elementary unit cells, each of them exhibiting analytically known dispersion diagram. The band-gap of the macro unit cell is positioned at lower frequencies that of the different unit cells that have their own band-gap at higher frequency range. Analyses of different sequences are presented, and it is demonstrated that the order of the arrangement allows controlling of the position of the bandgap while for different combinations of same order band-gap shift is negligible.