Uniplanar PBG screens for forming the antenna pattern

The possibility of forming the wideband 8-shaped pattern of an antenna in the H-plane with the use of a uniplanar photonic bandgap screen (UPPBGS) is studied. Two variants of UPPBGS are compared. The first is the known structure developed by the group of T. Itoh, the second is its suggested modification (presented by the authors). It is shown that the modified structure operates at lower frequencies than does the known structure (for the same cell size).