摘 要：目前，印刷四臂螺旋天线可以广泛的应用于诸如移动卫星通讯，广播卫星系统和全球定位系统等多种系统中。然而，对于这些系统应用而言，传统的印刷四臂螺旋天线的带宽已不能满足它们的需求。因此，本文设计一种新型的印刷四臂螺旋天线。展示了一种渐变辐射臂宽度和寄生短路臂相结合的宽带技术。同时本文提出了一种基于平行双线的功分馈电网络，有效的减小了传统四臂螺旋天线馈电网络的尺寸。实测结果表明该天线的工作带宽达到了28%（1.86 ～ 2.5GHz）以上。
关键词：宽带天线；圆极化；印刷四臂螺旋天线
中图分类号：TN823.31 文献标识码：A 文章编号：2096-4706（2018）03-0048-06
Design of Broadband Folded Tapered Printed Quadrifilar Helical Antenna
WANG Chen
（Southwest China Institute of Electronic Technology，Chengdu 610036，China）
Abstract：Today the printed quadrifilar helical antenna（PQHA）can be widely applied to many applications such as mobile satellite communications，broadcasting satellite systems and global positioning systems. Nevertheless，the bandwidth of a conventional PQHA could be insufficient for applications. A new PQHA design is investigated in this paper. A technique of Increasing the bandwidth of the PQHA by modifying the wire width and adding a shorted parasitic helix is presented. And a power divider based on double-sided parallel striplines（DSPSL）is proposed to reduce the size of the conventional feeding network. Experimental results show that the bandwidth can reach more than 28%（1.86-2.5GHz）.
Keywords：broadband antenna；circular polarization；printed quadrifilar helical antenna（PQHA）
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作者简介：王宸（1985-），男，汉族，陕西汉中人，工程师，博士，研究方向：航空通信系统射频微波技术。