Abdulwali Zaed S A, Alqahtani Ali H, Aladadi Yosef T, Alkanhal Majeed A S, Al-Moliki Yahya M, Aljaloud Khaled, Alresheedi Mohammed Thamer
Department of Electrical Engineering, King Saud University, Riyadh 11421, Saudi Arabia.
Department of Applied Electrical Engineering, Al-Muzahimya Campus, College of Applied Engineering, King Saud University, Riyadh 11421, Saudi Arabia.
Sensors (Basel). 2023 Sep 7;23(18):7725. doi: 10.3390/s23187725.
This paper presents a novel circularly polarized rectenna designed for efficient electromagnetic energy harvesting at the 2.45 GHz ISM band. A compact antenna structure is designed to achieve high performance in terms of radiation efficiency, axial ratio, directivity, effective area, and harmonic rejection over the entire bandwidth of the ISM frequency band. The optimized rectifier circuit enhances the RF harvested energy efficiency, with an AC-to-DC conversion efficiency ranging from 36% to 70% for low-level input power ranging from -10 dBm to 0 dBm. The stable output of DC power confirms the suitability of this design for various practical applications, including wireless sensor networks, energy harvesting power supplies, medical implants, and environmental monitoring systems. Experimental validation, which includes both the reflection coefficient and radiation patterns of the designed antenna, confirms the accuracy of the simulation. The study found that the proposed energy harvesting system has a high total efficiency ranging from 53% to 63% and is well-suited for low-power energy harvesting (0 dBm) from ambient electromagnetic radiation. The proposed circularly polarized rectenna is a competitive option for efficient electromagnetic energy harvesting, both as a standalone unit and in an array, due to its high performance, feasibility, and versatility in meeting various energy harvesting requirements. This makes it a promising and cost-effective solution for various wireless communication applications, offering great potential for efficient energy harvesting from ambient electromagnetic radiation.
本文提出了一种新颖的圆极化整流天线，其设计目的是在2.45 GHz工业、科学和医疗（ISM）频段实现高效的电磁能量收集。设计了一种紧凑的天线结构，以便在ISM频段的整个带宽上，在辐射效率、轴比、方向性、有效面积和谐波抑制方面实现高性能。优化后的整流电路提高了射频收集能量的效率，对于-10 dBm至0 dBm的低电平输入功率，其交流到直流的转换效率在36%至70%之间。直流电源的稳定输出证实了该设计适用于各种实际应用，包括无线传感器网络、能量收集电源、医疗植入物和环境监测系统。包括所设计天线的反射系数和辐射方向图在内的实验验证证实了仿真的准确性。研究发现，所提出的能量收集系统具有53%至63%的高总效率，非常适合从环境电磁辐射中进行低功率能量收集（0 dBm）。所提出的圆极化整流天线无论是作为独立单元还是作为阵列，由于其高性能、可行性以及在满足各种能量收集要求方面的通用性，都是高效电磁能量收集的一个有竞争力的选择。这使其成为各种无线通信应用中一种有前景且具有成本效益的解决方案，为从环境电磁辐射中高效收集能量提供了巨大潜力。
