volume | PIER Journals

Abstract

This paper presents a compact dual-band RF energy harvesting rectifier designed for operation at 2.45 GHz and 5.2 GHz Industrial, Scientific, and Medical (ISM) bands. The rectifier employs a voltage-doubler topology integrated with a dual-band impedance matching network (MN) composed of a coupled-line section and a microstrip transmission line. The analytical design of the MN is established using the ABCD-matrix formulation to determine the initial modal impedances and electrical lengths, which are subsequently refined through full-wave electromagnetic optimization in ADS. The proposed approach achieves accurate dual-frequency impedance transformation using only two matching segments, significantly simplifying the structure compared with conventional multi-section designs. The prototype, fabricated on a low-cost FR-4 substrate, occupies a compact area of 34×25 mm². Measurements show high power conversion efficiencies of 75% and 55% at 2.45 GHz and 5.2 GHz, respectively, under a 0 dBm input power and a 1 kΩ load, in close agreement with simulations. The results confirm that the proposed design provides an effective and low-cost solution for ambient RF energy harvesting and low-power IoT applications.

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Dr. Yassmeen Mohammed Afify

Dr. Ahmed Allam

Dr. Haruichi Kanaya

Professor Adel Bedair Abdel-Rahman