Beam-Steerable Dual-Polarized mmWave Array Enabling SWIPT for Wearable IoMT

초록

This article presents a millimeter-wave (mmWave) simultaneous wireless information and power transfer (SWIPT) system enabling duty-cycled battery-free operation of wearable Internet of Medical Things (IoMT) devices through targeted mmWave power delivery and concurrent high-rate data communication. The transmitter incorporates a beam-steerable, dual-polarized $4imes4$ stacked-patch array driven by four Renesas F5288 beamformer integrated circuits, enabling independent polarization control for polarization-division SWIPT-one polarization dedicated to continuous-wave power transfer and the orthogonal polarization to modulated data transmission. The wearable receiver integrates a flexible textile-based series-fed patch array with two MA4E1317-diode rectifier topologies: a dual-diode voltage doubler and single-diode shunt rectifier. Cosimulations predict peak power conversion efficiencies of 68% and 60%, respectively, while measurements confirm efficiencies above 56% and 52.2%. Manual codebook-based beam selection maintains robust mmWave links over wide angular variations. Measurements demonstrate up to 1.8 mW of rectified DC power at 700 mm and 0.5-0.7 mW at 1 m, sufficient to sustain duty-cycled IoMT node operation. A proof-of-concept system combining the rectenna, a BQ25504 power-management unit, and a CC2650STK bluetooth low energy (BLE) sensor node validates 28-GHz polarization-division SWIPT as a practical architecture for wirelessly powered wearable healthcare devices in emerging 5G/6G environments.

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