Reconfigurable Binary-Amplitude Fresnel Zone Plate for Millimeter-Wave Beamforming

This article presents a reconfigurable Fresnel zone plate (FZP) operating at 30 GHz with a low-cost printed circuit board (PCB) process. In general, limited fabrication tolerance greatly limits the optimal design of reconfigurable unit cells at millimeter-wave frequencies. In this work, the freedom of the unit-cell design is improved using a fixed I-shaped element as an impedance matching layer. I...