Bandwidth enhancement for RCS reduction using checkerboard EBG surfaces

The properties of Electromagnetic Band-Gap (EBG) structures are used to alter the scattering fields by combining Perfect Electric Conductor (PEC) and EBG structures on the same ground plane. Due to the anti-phase property, the reflected energy can be re-directed toward four quadrants and a null to appear toward the normal direction. To increase the bandwidth, checkerboard surfaces of different EBG structures on the same ground plane are proposed. Two different configurations of EBG structures are designed to realize the 180° phase difference, in order to achieve a wider band Radar Cross Section (RCS) reduction. The RCS of the surfaces are compared with those of the equal-sized PEC ground planes.