PHASE CORRECTING ZONAL REFLECTOR INCORPORATING RINGS

An array of conducting elements printed on a grounded dielectric subst rate functions as an electromagnetic phase shifter. With a fixed subst rate and a given operating frequency, the phase shift is determined by the array parameters. In the paper, the spectral domain moment method model for analyzing homogeneous reflective phase shifters with conduc ting rings as elements is presented, and numerical and experimental re sults are given. A novel phase correcting Fresnel zonal reflector base d on this model is reported. A 43% maximum antenna efficiency and -22 dB sidelobe level were measured in X-band. The bandwidth of the reflec tor is estimated to be greater than 10%.