Investigation of a Broadband Circularly Polarized Printed Monopole Antenna for RF Energy Harvesting Application

B. R. Behera, S. Mishra
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Abstract

A superstrate-loaded broadband circularly polarized (CP) printed monopole antenna is evaluated for the RF energy harvesting application. For achieving broadband CP traits, enhanced antenna gain and strong directional pattern with wide 3-dB angular beamwidth, circular-shaped monopole having asymmetrical staircased ground plane loaded with PEC superstrate is considered. It is fabricated on the FR-4 substrate with dimension of $1.25\lambda_{\mathrm{o}}\times 1.66\lambda_{\mathrm{o}}\times 0.02\lambda_{\mathrm{o}}$. The proposed prototype exhibits a measured IBW of 5.62 GHz (1.3-6.92 GHz, 136.8%) with ARBW of 1.55 GHz (4.04-5.59 GHz, 32.22%), antenna gain > 6.5 dBic, directional pattern with improved front-to-back ratio (FBR), antenna efficiency > 85% in its operating bands (sub-6 GHz).
用于射频能量采集的宽带圆极化印刷单极天线研究
研究了一种上层负载宽带圆极化印刷单极天线在射频能量采集中的应用。为了实现宽带CP特性、增强天线增益和具有宽3db角波束宽度的强定向方向图,考虑了具有非对称楼梯式接地面的圆形单极子,并加载了PEC层。它是在FR-4衬底上制作的,尺寸为$1.25\lambda_{\ mathm {o}}乘以$ 1.66\lambda_{\ mathm {o}}\乘以0.02\lambda_{\ mathm {o}}$。该样机的实测IBW为5.62 GHz (1.3 ~ 6.92 GHz, 136.8%), ARBW为1.55 GHz (4.04 ~ 5.59 GHz, 32.22%),天线增益> 6.5 dBic,方向图的前后比(FBR)得到改善,在其工作频段(sub-6 GHz)天线效率> 85%。
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