Smart Shoe Based on Battery-Free Bluetooth Low Energy Sensor

Nguyen, Thanh Hung; Tran, Minh; Le, Quang Huy; Vu, Thi Anh; Nguyen, Quoc Cuong; Nguyen, Dai Duong; Le, Minh Thuy

doi:10.1007/978-3-030-77424-0_13

Cited by 2 publications

(2 citation statements)

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“…Powering the indoor WSNs for such applications with a sustainable power source is of particular interest. And since low-power WSNs only consume several milliwatts in the full-active mode, <1 mW in limited action modes, and microwatts in their sleep mode [1][2][3], they can be supplied with radio-frequency (RF) waves in the ambience. For example, the sensor node in [2] consumes at maximum 23.7 mW, and the sensor node in [3] consumes up to 11 mW.…”

Section: Introductionmentioning

confidence: 99%

“…And since low-power WSNs only consume several milliwatts in the full-active mode, <1 mW in limited action modes, and microwatts in their sleep mode [1][2][3], they can be supplied with radio-frequency (RF) waves in the ambience. For example, the sensor node in [2] consumes at maximum 23.7 mW, and the sensor node in [3] consumes up to 11 mW. For this purpose, Wi-Fi, consisting of the 2.45 and 5.8 GHz bands, is the ideal candidate due to its predominance in the indoor environment.…”

Section: Introductionmentioning

confidence: 99%

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Dual-band ambient energy harvesting systems based on metamaterials for self-powered indoorwireless sensor nodes

Ngo²,

Nguyễn

et al. 2021

Int. J. Microw. Wireless Technol.

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In this study, we present a comprehensive dual-band ambient radio-frequency (RF) energy harvesting system, consisting of rectenna and power management circuit, to harvest energy from 2.45 and 5.8 GHz Wi-Fi. The rectenna employs a metamaterial antenna based on a split-ring resonator, which possesses omni-directional radiation pattern at both frequencies and compact size (0.18λ × 0.25λ at 2.45 GHz). The dual-band rectifier yields the highest efficiency of 42% at 2.45 GHz and 1 dBm input power, 30% at 5.8 GHz and − 7 dBm input power. The maximum RF-DC efficiency for each band is 72% at − 5 dBm and 27% at − 2 dBm, respectively. The power management circuit, consisting of a storing capacitor and a boost converter, is integrated to produce a stable, sufficient output voltage. The energy harvesting system, with its comprehensiveness, is suitable for supplying low-power wireless sensor nodes for indoor applications.

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