ABSTRACT

This paper introduces a wideband circularly polarized rectenna that can harvest efficiently ambient wireless power with bandwidth from 1.7 to 2.6 GHz in both wide operating power and output load ranges. The rectenna is based on a high gain wideband slot microstip receiving antenna array and a wideband rectifier with a branch-line coupler that appropriately improve the RF-dc conversion efficiency at ambient wireless power level in a wide input power range, working frequency and a wide load impedance range. The circular polarization is obtained using by corner perturbation on a square radiation patch and has a bandwidth for axial ratio < 6 dB from 1.65 to 2.76 GHz. An example of the antenna and rectifier circuit have been designed, fabricated and tested. In the proposed rectifier, a peak efficiency of 69% with 12 dBm input power and 64% with 10 dBm input is obtained for a load of 1 KΩ at 1.85 and 2.45 GHz, respectively. The efficiency and dc output of the proposed rectenna is also measured at different frequencies and received power levels with a load resistance of 1 kΩ. The rectenna depicts well performance for the real applications with a much-easy configuration and decreased cost.

摘要

本文介绍了一种宽带圆极化整流天线，它可以在宽工作功率和输出负载范围内高效地收集 1.7 至 2.6 GHz 带宽的环境无线功率。整流天线基于高增益宽带隙缝微针接收天线阵列和带分支线耦合器的宽带整流器，在宽输入功率范围、工作频率和宽频范围内适当提高环境无线功率水平下的RF-DC转换效率。负载阻抗范围。圆极化是通过对方形辐射贴片的角扰动获得的，并且在 1.65 到 2.76 GHz 范围内具有轴比 < 6 dB 的带宽。已经设计、制造和测试了天线和整流器电路的示例。在建议的整流器中，对于 1 KΩ 负载在 1.85 和 2.45 GHz 下分别获得 69% 的峰值效率和 12 dBm 的输入功率和 64% 的 10 dBm 输入。建议的整流天线的效率和直流输出也在不同的频率和接收的功率水平下测量，负载电阻为 1 kΩ。整流天线以非常容易的配置和降低的成本为实际应用描绘了良好的性能。