Electrically Small, Low-Profile, Highly Efficient, Huygens Dipole Rectennas for Wirelessly Powering Internet-of-Things Devices

Wei Lin, Richard W Ziolkowski, Jianquan Huang

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

Wireless power transfer (WPT) technologies are a major trend in emerging internet-of-things (IoT) applications. Because they negate the need for heavy, bulky batteries and can power multiple elements simultaneously, WPT systems enable very compact ubiquitous IoT wireless devices. However, the realization of high-performance, ultracompact (electrically small) rectennas, i.e., the rectifying antennas that enable midrange and far-field WPT, is challenging. We present the first electrically small ( \textit {ka} < 0.77 ) and low-profile ( 0.04~\lambda -{0} ) linearly (LP) and circularly (CP) polarized WPT rectennas at 915 MHz in the IMS band. They are facilitated by the seamless integration of highly efficient rectifiers, i.e., RF signal to dc power conversion circuits, with electrically small Huygens dipole LP and CP antennas. Their optimized prototypes have cardioid, broadside radiation patterns, and effective capture areas larger than their physical size. Experimental results validate that they achieve an 89% peak ac-to-dc conversion efficiency, effectively confirming that they are ideal candidates for many of the emerging IoT applications.

Original languageEnglish (US)
Article number8658001
Pages (from-to)3670-3679
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume67
Issue number6
DOIs
StatePublished - Jun 1 2019

Keywords

  • Electrically small rectennas
  • Huygens radiation pattern
  • internet of things (IoT)
  • rectifier circuits
  • wireless power transfer (WPT)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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