MULTILAYER PHASE CORRECTING FRESNEL ZONE PLATE REFLECTOR ANTENNAS

Owing to its flat nature and light weight etc., the Fresnel zone plate antenna is becoming very attractive for such applications as DBS rece ption and receive-only VSAT. The disadvantages of low efficiency and h igh sidelobes of the simple and the phase reversing zone plates can be improved by using phase correcting techniques. In this paper, a syste matic investigation on the efficiency and sidelobe performance of subz one phase correcting zone plate antennas is presented. The design of a form of multilayer phase correcting zone plate reflector is described . A quarter-wave zone plate reflector constructed with three dielectri c layers and metallized rings is reported, with measured peak efficien cy of 55 per cent.