Design of a High-Efficiency 2.45-GHz Rectenna for Low-Input-Power Energy Harvesting

Author

Sun, Hucheng ; Guo, Yong-Xin ; He, Miao ; Zhong, Zheng

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore

Volume

11

fYear

2012

fDate

7/4/1905 12:00:00 AM

Firstpage

929

Lastpage

932

Abstract

This letter presents a high-efficiency 2.45-GHz rectenna that can harvest low input RF power effectively. A new antenna with a simple structure and high gain of 8.6 dBi is proposed for the rectenna. The antenna is designed to directly match the rectifying circuit at 2.45 GHz and mismatch it at the second and third harmonics so that the use of bandpass filter between the antenna and rectifying circuit can be eliminated. The rectenna shows a maximum conversion efficiency of 83% with a load resistance of 1400 Ω. Furthermore, the overall conversion efficiency can remain 50% for the low, -17.2 dBm (corresponding power density 0.22 μW/cm² ) input power level.

Keywords

band-pass filters; energy harvesting; harmonic generation; low-power electronics; rectennas; rectifying circuits; bandpass filter; conversion efficiency; efficiency 83 percent; frequency 2.45 GHz; high-efficiency rectenna; load resistance; low input RF power; low-input-power energy harvesting; power density; rectifying circuit; resistance 1400 ohm; second harmonics; third harmonics; Antenna measurements; Dipole antennas; Harmonic analysis; Power harmonic filters; Rectennas; Rectifiers; Antenna; energy harvesting; rectenna; rectifier;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2012.2212232

Filename

6262453