Wideband Passive and Active Wearable Energy Harvesting Systems for Medical and IOT Applications

Albert Sabban

A chapter in Innovation in Global Green Technologies 2020 from IntechOpen

Abstract: Demand for green energy is in continuous growth in the last years. Compact efficient antennas are crucial for energy harvesting portable systems. Small antennas have low efficiency. The efficiency of communication and energy harvesting systems may be improved by using efficient passive and active antennas. The system dynamic range may be improved by connecting amplifiers to the small antenna feed line. Novel passive and active portable harvesting systems are presented in this chapter. Printed patch, notch and Slot antennas are compact and have low volume. The active antennas may be employed in energy harvesting wearable systems. The antennas and the harvesting system components may be assembled on the same printed board. The printed notch and slot antennas bandwidth are from 40 to 100% for VSWR better than 3:1. The slot antenna gain is around 3 dBi with efficiency higher than 85%. The antennas' electrical parameters were computed in free space and near the human body. The active notch antenna gain is around 23 ± 3dB for frequencies ranging from 200 to 900 MHz. The active notch antenna gain is 13 ± 3 dB for frequencies ranging from 1 to 3 GHz. The active notch and slot antenna noise figure is 0.5 ± 0.3dB for frequencies ranging from 200 MHz to 3 GHz.

Keywords: energy harvesting systems; wearable sensors; active systems; medical applications; sensor chargers (search for similar items in EconPapers)
JEL-codes: Q55 (search for similar items in EconPapers)
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Persistent link: https://EconPapers.repec.org/RePEc:ito:pchaps:205571

DOI: 10.5772/intechopen.89699

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