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E-WEHP: A batteryless embedded sensor-platform wirelessly powered from ambient digital-TV signals

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Details

Original languageEnglish
Article number6513298
Pages (from-to)2491-2505
Number of pages15
JournalIEEE Transactions on Microwave Theory and Techniques
Volume61
Issue number6
DOIs
Publication statusPublished - 2013
Publication typeA1 Journal article-refereed

Abstract

The use of digital television broadcasting standards has resulted in transmission of perpetually on wireless digital-TV signals over the air at wider bandwidths in ultrahigh-frequency bands for high-definition video and audio broadcasts to TV and smart phones. This paper presents a unique embedded wireless energy-harvesting prototype (E-WEHP) that exploits the unique makeup of ambient digital-TV signals, and scavenges wireless power from them at distance of over 6.3 km from the TV broadcast source. The harvested wireless power is successfully used to power and sustain a 16-bit embedded microcontroller for sensing and machine-to-machine applications without the use of batteries. The E-WEHP uses a miniaturized planar log-periodic antenna and RF-dc charge-pump circuit with maximum sensitivities of-14.6 and-18.86 dBm and an embedded firmware-based power management scheme to power microcontroller peripherals from different types of ambient digital-TV signals.

Keywords

  • Antenna, autonomous sensors, charge-pump, digital TV, embedded microcontroller, energy harvesting, power scavenging, RF-dc, ultrahigh-frequency (UHF), voltage multiplier, wireless power