Journals / CMC / Vol.68, No.1
Table of Content

Research Article

BEST PAPER 2021

A Compact Dual-Port Multi-Band Rectifier Circuit for RF Energy Harvesting

Surajo Muhammad1,*, Jun Jiat Tiang1, Sew Kin Wong1, Amjad Iqbal1, Amor Smida2, Mohamed Karim Azizi3
1 Centre for Wireless Technology, Faculty of Engineering, Multimedia University, Cyberjaya, 63100, Malaysia
2 Department of Medical Equipment Technology, College of Applied Medical Sciences, Majmaah University, AlMajmaah, 11952, Saudi Arabia
3 Department of Physics, Microwave Electronics Research Laboratory, Faculty of Mathematical, Physical and Natural Sciences of Tunis, Tunis El Manar University, Tunis, 2092, Tunisia
* Corresponding Author: Surajo Muhammad. Email:
(This article belongs to this Special Issue: Advances in 5G Antenna Designs and Systems)

Abstract

This paper presents a compact multi-band rectifier with an improved impedance matching bandwidth. It uses a combination of п–matching network (MN) at Port-1, with a parallel connection of three cell branch MN at Port-2. The proposed impedance matching network (IMN) is adopted to reduce circuit complexity, to improve circuit performance, and power conversion efficiency (PCE) of the rectifier at low input power. The fabricated rectifier prototype operates at 0.92, 1.82, 2.1, 2.46 and 2.65 GHz covering GSM/900, GSM/1800, UMTS2100, and Wi-Fi/2.45–LTE2600. The size of the compact rectifier on the PCB board is 0.13λg × 0.1λg. The fabricated rectifier achieved an RF-to DC (radio frequency direct current) PCE of 31.8%, 24%, 22.7%, and 15%, and 14.1% for −20 dBm at the five respective measured operating frequencies. The circuit attains a peak RF-to-DC PCE of 82.3% for an input power of 3 dBm at 0.92 GHz. The proposed rectifier realizes an ambient output dc voltage of 454 mV for multi-tone input signals from the two ports. The rectifier drives a bq25504-674 power management module (PMM) to achieve 1.21 V from the two-port connection. The rectifier has the ability to exploit both frequency domain through the multi-band operation with good impedance bandwidth and a spatial domain using dual-port configuration. Hence, it is a potential candidate for various applications in radio frequency energy harvesting (RFEH) system.

Keywords

RF energy harvesting; impedance matching network; power conversion efficiency; multi-band rectifier; dual-port; power management module
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