This research presents a straightforward design methodology for achieving practical superdirective antenna arrays. By addressing traditional challenges such as impedance matching to 50 ohms, enhancing radiation efficiency, and achieving high directivity, it establishes a pathway for realizing super realized gain. This advancement holds significant potential for next-generation wireless technologies, including 5G, IoT, and beyond.

D. P. Lynch, M. M. Tentzeris, V. Fusco and S. D. Asimonis, "Super Realized Gain Antenna Array," in IEEE Transactions on Antennas and Propagation, vol. 72, no. 9, pp. 7030-7040, Sept. 2024, doi: 10.1109/TAP.2024.3437218.

This work introduces an innovative tetra-band metamaterial RF harvester operating at 0.9, 1.8, 2.1, and 2.45 GHz, using independent rectifier units (“pseudobatteries”). It delivers up to 562 µW per unit cell at 40 µW/cm² power density, with an 8×8 array producing ~39.1 mW DC harvested power. This breakthrough offers a highly efficient RF energy harvesting solution for low-power-density ambient RF environments, operating down to 0.0073 μW/cm², enabling sustainable, battery-free functionality for next-generation IoT networks.

A. M. Graham, S. N. Daskalakis, V. Fusco, M. M. Tentzeris and S. D. Asimonis, "A Highly Efficient, Scalable, Tetra-Band Metamaterial-Based Ambient RF Energy Harvester," in IEEE Transactions on Microwave Theory and Techniques, doi: 10.1109/TMTT.2025.3555848.