A Flexible, Tileable Phased Array Enabled by CMOS Beamformers

This work presents a flexible phased array tile designed and fabricated for wireless power transfer at 10 GHz. The system is driven by custom CMOS RFICs fabricated in a 22nm CMOS FDSOI process. The chip achieves an overall DC-RF efficiency of 42% and includes a VCDL-based phase shifter with DLL self-calibration that compensates for PVT, enabling rapid and accurate refocusing of the array to different targets. The fabricated 8x8 array radiates 850 mW of power, 385 mW of which is rectified to DC by a 56.25 cm2 rectenna at a distance of 20 cm. The array is evaluated under flat, convex, and concave bending conditions to verify its flexibility.