圆锥印刷四臂螺旋天线的分析与设计

Analysis and Design of Conical Printed Quadrifilar Helical Antenna

提出了一种应用于全球定位系统（GPS）的宽波束圆极化圆锥印刷四臂螺旋天线。数值分析表明螺旋角和螺旋臂的长度是影响波瓣宽度的两个主要因素，文中给出了其变化规律。基于此，我们设计了一个中心频率为1．57542GHz的圆极化圆锥印刷四臂螺旋天线，并制作了模型天线。测试结果显示该天线在中心频率处的3dB波瓣宽度约为200°，满足半球覆盖特性；3dB轴比带宽约为0．35GHz；驻波比在1．5以下的频率范围为1．47-1．6GHz。实验结果和仿真结果吻合良好。

A novel conical printed quadrifilar helical antenna for GPS application is presented. The antenna behaves wide beamwidth and circular polarization. Numerical simulations show that the pitch angle and the length of radiating arms are main factors which influence the beamwidth of this kind of antenna. The model antenna designed working at center frequency of 1. 57542GHz characterizes： 1 ） about 200 degrees of 3dB beamwidth which satisfies the requirement of the hemisphere radiation, 2） about 0.35GHz of 3dB axial-ratio bandwidth, and 3） VSWR under 1.5：1 covering 1.47 - 1.6GHz. The measured results agree well with numerical ones.