Review Article
Technologies for Near-Field Focused Microwave Antennas
Figure 4
Basic geometrical configurations of different NFF planar lens antennas: (a) reflectarray, (b) transmitarray, and (c) Fresnel zone plate lens. The spherical wave radiated by the feed at interacts with the antenna layer to excite a field that is focused at .
(a) |
(b) |
(c) |