volume | PIER Journals

Abstract

RF rectifier circuits are critical to powering IOT sensors through energy harvesting process, allowing devices to operate without conventional batteries. This paper presents an efficient and dual-band RF rectifier circuit working at 0.915 GHz and 2.45 GHz frequencies which could be used in IOT power sensor devices. The design of a dual-band matching circuit, which is a key element of the RF rectifier, is discussed, and closed-form expressions are derived to extract the most significant parameters. In order to simplify the matching circuit, only three microstrip line sections are required in this design. The first line makes the structure independent of frequency, and the second and third lines are used to transfer the desired impedance to 50 Ohm of the source. For validation, a dual-band RF rectifier circuit using SMS7621-079LF Schottky diode is fabricated. The measured results show that the fabricated rectifier can achieve power conversion efficiency (PCE) around 65.7% and 62.4% (with a load resistance of 2500 Ohm and 5 dBm input power) at 0.915 GHz and 2.45 GHz, respectively. The dual-band and high-efficiency features of the proposed rectifier make it suitable for energy harvesting (EH) systems to power IOT sensor devices.

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Mr. Meghdad Khodaei

Prof. Halim Boutayeb

Professor Larbi Talbi

Dr. Alireza Ghayekhloo