Matching network elimination in broadband rectennas for high-efficiency wireless power transfer and energy harvesting

Chaoyun Song, Yi Huang, Jiafeng Zhou, Paul Carter, Sheng Yuan, Qian Xu, Zhouxiang Fei

Research output: Contribution to journalArticle

75 Citations (Scopus)

Abstract

Impedance matching networks for nonlinear devices such as amplifiers and rectifiers are normally very challenging to design, particularly for broadband and multiband devices. A novel design concept for a broadband high-efficiency rectenna without using matching networks is presented in this paper for the first time. An off-center-fed dipole antenna with relatively high input impedance over a wide frequency band is proposed. The antenna impedance can be tuned to the desired value and directly provides a complex conjugate match to the impedance of a rectifier. The received RF power by the antenna can be delivered to the rectifier efficiently without using impedance matching networks; thus, the proposed rectenna is of a simple structure, low cost, and compact size. In addition, the rectenna can work well under different operating conditions and using different types of rectifying diodes. A rectenna has been designed and made based on this concept. The measured results show that the rectenna is of high power conversion efficiency (more than 60%) in two wide bands, which are 0.9-1.1 and 1.8-2.5 GHz, for mobile, Wi-Fi, and ISM bands. Moreover, by using different diodes, the rectenna can maintain its wide bandwidth and high efficiency over a wide range of input power levels (from 0 to 23 dBm) and load values (from 200 to 2000 Ω). It is, therefore, suitable for high-efficiency wireless power transfer or energy harvesting applications. The proposed rectenna is general and simple in structure without the need for a matching network hence is of great significance for many applications.
Original languageEnglish
Pages (from-to)3950-3961
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume64
Issue number5
Early online date28 Dec 2016
DOIs
Publication statusPublished - 10 Apr 2017

Keywords

  • broadband rectennas
  • impedance matching networks
  • off-center-fed dipole (OCFD)
  • wireless energy harvesting (WEH)
  • wireless power transmission
  • broadband antennas
  • dipole antennas
  • energy harvesting
  • radiofrequency power transmission

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