Inductive Wireless Power Transfer and Uplink Design for a CMOS Tag With 0.01 mm2 Coil Size

This work introduces the smallest inductive wireless power transfer and backscattering communication link to date, with tag coil only of 0.01 mm
²
. The CMOS tag, operated at 4.7 GHz, generates a 0.1-mW dc power under a coupling distance of 1.2 mm and reader power of 31.4 dBm. The on-off keying back-scattering uplink is demonstrated with data rate of 20 kb/s.