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 mm2. 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.

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