Comparison of an elementary hologram and a Fresnel zone plate

The performance of an elementary hologram is compared to that of a Presnel zone plate for imaging, spatial power combining, or for antenna applications. The focal- field power, resolution, and far-field patterns are computed and compared for various focal lengths. Results show that the Presnel zone plate offers better resolution, and about a 2 dB increase in both focusing power and in directivity, compared to the elementary amplitude hologram. However, by proper binary discretization of the hologram, identical results can be obtained.