一种高效率圆极化背腔天线阵的设计

设计了一种新型单臂螺旋边馈阶梯喇叭圆极化背腔天线，天线单元由阶梯喇叭、单臂螺旋及圆形背腔组成.单臂螺旋采用准空气同轴线激励，给出了天线单元的轴比、驻波、方向图宽频带特性.提出单元旋转反相馈电方法改善了天线子阵轴比和极化隔离，同时解决了馈电空间狭小的难题.对阵列进行了加工测试，测试与仿真结果吻合.结果显示，天线增益、驻波带宽、轴比带宽和方向图性能优良，此种天线具有很好的工程应用前景.

A design for high-efficiency circularly polarized cavity-backed antenna array

A new stepped horn circularly polarized antenna uses single-arm spiral outer-fed is designed.The antenna configuration consists of a ladder horn，a single-arm spiral，and a circularly backed cavity.Single-arm spiral out-fed by air coaxial line，the proposed contains broadband characteristics in terms of the axial ratio，voltage standing wave ratio（VSWR)，and gain performances for antenna element.rotate reversed-phase feeding technique is used to improve the performance of sub-antenna such as axial ratio and polarization isolation，and solved difficult problem of narrowness space for feed network.The antenna array are fabricated and measured.Simulated and measured result show good agreements.Results show that the antenna array have substantially better performances，in terms of gain，VSWR bandwidth，axial-ratio bandwidth and radiation pattern，that have good engineering application foreground.