宽带双圆极化天线阵列

Wideband Dual Circularly Polarized Antenna Array

本文设计了一种覆盖K波段的宽带双圆极化天线阵列。天线的辐射单元采用隔板极化器的形式,实现较好的双圆极化性能,工作带宽较宽且结构简单。馈电部分采用方形同轴线的形式,使得整个馈电网络结构紧凑,大大提高了天线的效率和空间利用率。仿真结果表明,在所需的15 GHz-25 GHz频段内|S_(11)|和|S_(22)|均小于-13 dB,轴比小于3 dB,增益大于15 dBic,xoz面和yoz面的副瓣电平分别优于-12.5 dB和-12.5 dB,方向图稳定。所设计的天线阵列结构紧凑,易于加工,在卫星通信应用中具有良好的前景。

In this paper,a wideband dual circularly polarized(CP)antenna array covering K band is designed.The radiating element of the antenna adopts the form of a separator polarizer to achieve better dual CP performance,wide working bandwidth and simple structure.The feeding part adopts the form of square coaxial line,which makes the structure of the whole feeding network compact,and greatly improves the efficiency and space utilization of the antenna.The simulation results show that in the required 15 GHz-25 GHz frequency band|S_(11)|and|S_(22)|are both less than 13 dB,axial ratio(AR)is less than 3 dB,the gain is greater than 15 dBic,the sidelobe levels of the xoz-plane and yozplane are better than the 12.5 dB and 12.5 dB respectively,and the pattern is stable.The designed antenna array is compact and easy to be processed,which has a good prospect in satellite communication applications(SATCOMs).