In this paper, a low-profile, compact and efficient broadband circularly polarized (CP) printed Y-shaped monopole antenna using twin parasitic conducting strips and rectangular metasurface is investigated for RF energy harvesting. The proposed antenna comprises of simple Y-shaped linearly polarized (LP) monopole antenna with the partial ground plane [antenna-1]. To achieve CP from LP, one of the parasitic conducting strip (PCS_L) is shorted with partial ground plane [antenna 2]. Using rectangular metasurface of 1.06λ_o × 0.3λ_o × 0.02λ_o, i.e. parasitic patch below the upper edge of FR-4 substrate [antenna-3], is used to improve impedance bandwidth and axial bandwidth. Antenna-3 is fabricated on FR-4 substrate, with overall dimension of 1.21λ_o × 0.9λ_o × 0.02λ_o at λ_o = 4.5 GHz. It offers measured impedance bandwidth of 2.62 GHz (3.27–5.89 GHz, 57.21%), with axial bandwidth of 1.21 GHz (4.21–5.42 GHz, 25.25%) and average gain of 4.92 dBi with antenna efficiency ≥ 72%. Time domain characteristics is analysed and obtained group delay is within 2 ns in the desired band. It is observed from the results that the proposed antenna can be used for RF energy harvesting application. The proposed antenna embedded with multi-stage rectifier of RF energy system is analyzed, calculated RF-to-DC efficiency using ADS and reported.

在本文中，研究了一种使用双寄生导电带和矩形超表面的低调，紧凑，高效的宽带圆极化（CP）印刷Y形单极天线，用于射频能量收集。所提出的天线包括具有部分接地平面[antenna-1]的简单Y形线性极化（LP）单极天线。为了从LP获得CP，将一个寄生导电带（PCS _L）与部分接地平面[天线2]短路。使用的1.06λ矩形超颖表面_ö  ×0.3λ _ö  ×0.02λ _øFR-4基板[antenna-3]上边缘下方的寄生贴片用于改善阻抗带宽和轴向带宽。天线3被制作在FR-4基板，具有1.21λ整体尺寸_ö  ×0.9λ _ö  ×0.02λ _ö在λ _Ô = 4.5 GHz。它提供的测量阻抗带宽为2.62 GHz（3.27–5.89 GHz，57.21％），轴向带宽为1.21 GHz（4.21-5.42 GHz，25.25％），平均增益为4.92 dBi，天线效率≥72％。分析时域特性，并在所需频带中的群延迟在2 ns之内。从结果可以看出，所建议的天线可用于射频能量收集应用。分析了所建议的嵌入了射频能量系统多级整流器的天线，并使用ADS计算了射频到直流的效率并进行了报告。