一种具有平面端射圆极化的互补八木阵列天线

A Complementary Yagi Arrays Antenna With Planar End-Fire Circularly Polarized

提出了一种新型的平面端射宽带圆极化天线,该天线是基于一对产生正交极化的互补型八木阵列和共同驱动元件的紧凑组合。为改善垂直极化八木阵列工作带宽窄的不足,对每个产生垂直极化的引向器两端引入对称狭缝切割,获得了宽轴比带宽。并在共同驱动元件与第一引向器之间引入耦合微带线来改善阻抗带宽。同时为共同驱动元件与水平极化的条状偶极子引向器之间引入了微带过渡枝节进一步提高天线性能。经过HFSS仿真软件优化分析,所提出天线的总尺寸为68mm×70mm×3mm。获得了S11<-10 dB的阻抗带宽为4.59~5.22GHz(13.0%),轴比带宽为4.58~5.19GHz(12.5%)。

A novel planar end-fire circularly polarized antenna having a wide bandwidth is proposed,which is based on a compact combination of a pair of complementary Yagi arrays that produce orthogonal polarization and common drive element.In order to improve the narrow working bandwidth of the vertically polarized Yagi array,A set of symmetric slits are introduced to cut each director of the vertically polarized and obtain a broad axial ratio bandwidth.A coupled microstrip line is introduced between the common drive element and the first director to improve the impedance bandwidth.At the same time,a microstrip line transition is introduced between the common drive element and the strip dipole of horizontally polarized director to further improve the antenna performance.The structure of the antenna were simulated and optimized by the HFSS software.The overall size of proposed antenna is 65 mm×65 mm×0.8 mm,and simulation results S11<-10 dB bandwidth of the antenna is 4.59-5.22 GHz(13.0%),a 3 dB axial ratio bandwidth of the antenna is 4.58-5.19 GHz(12.5%).