DOI: 10.1109/TMTT.2024.3402067   IEEEXplore: https://ieeexplore.ieee.org/document/10539374    

24 GHz Wireless Power Transfer System with an 8x8 Element 2-D Beam-Steerable TX Antenna Array (6cm x 6cm) and a 25 Planar Rectenna RX Array (6 cm x 6 cm)

24 GHz

A new figure of merit (FoM) calculation method is proposed to calculate the cost efficiency and spatial coverage of the system: FoMa for angular coverage. TX beam former chip selection reduces losses in the architecture by avoiding Wilkinson design and RF resistors due to the constant 50 ohm impedance over the potential phase and amplitude range. Non-isolation power splitters in the TX architecture significantly reduce losses in the architecture. RX passive beamforming is produced by utilizing patch antenna cells with eleven different gain patterns in an optimally organized 5x5 grid.

IoT device powering.

34 dBm summed output from beamformer chips with 7 dBm input power from the 24 GHz source , 22 dBi peak TX beamforming gain, 56 dBm TX effective isotropic radiated power (EIRP). 8.7 to 11.6 dB RX antenna gain, 1.9 to 5.7 dBm DC power delivered by the Rectenna rectifier array at 1 meter from the TX array. -28.3 dBm total efficiency, 20.6 dB FoM, -6.6 dB angular coverage FoMa with 1m TX-RX separation.