一种基于共面波导馈电的宽带多极化可重构天线

Reconfigurable Antenna with Wideband Multi-Polarization Based on Coplanar Waveguide Fed

为了应对日益复杂的通信环境,提高通信系统容量和通信质量,文中提出了一款基于共面波导馈电的宽带多极化可重构天线。该天线采用共面微带线设计,在参考地上开缝并置入4个PIN二极管,通过控制PIN二极管开关的开/关状态,天线表面电流分布被重构,从而改变天线在辐射远场的辐射状态;辅以优化的阻抗匹配和简单的寄生单元,进而实现宽带多极化可重构天线设计,包括线极化、左旋圆极化和右旋圆极化。实测结果显示,天线在3个极化模式下的重叠阻抗带宽(天线回波损耗丨S-11丨<-10 dB)达到48.5%,覆盖频率范围为2.42~3.97 GHz;圆极化模式下的重叠轴比带宽(轴比<3 dB)为48.2%,覆盖频率范围为2.33~3.81 GHz。天线实测结果与仿真结果有着较好的一致性,具有宽带、多极化模式的优势,可满足移动通信和卫星通信中多极化应用场景的需要。

To adapt to the more and more complex communication environment and improve the capacity and quality of communication system,a reconfigurable antenna with wideband multi-polarization based on CPW-fed(CPW:Coplanar Waveguide)was put forward.The antenna is based on coplanar microstrip lines.Four PIN diodes are placed on the slot etched on the ground plane.By controlling the on-off state of the PIN diode switch,the surface current distribution of the antenna is reconfigured,and the polarization mode of the antenna is changed.With the help of the optimized impedance matching and parasitic elements,the proposed reconfigurable antenna with wideband multi-polarization was designed,including LP(linear polarization),LHCP(left-hand circular polarization)and RHCP(right-hand circular polarization).The measured results show that,the overlapped impedance bandwidth of the proposed antenna in the three polarization modes can reach 48.5%(Antenna return loss|S11|<-10 dB,frequency range:2.42~3.97 GHz).Under the circular polarization mode,the overlapped axial ratio bandwidth is about 48.2%(axial ratio<3 dB,frequency range:2.33~3.81 GHz).The measured results of this antenna are in good agreement with the simulated ones.Owing to its advantage of wideband and multi-polarization modes,this antenna can meet the requirements of multi-polarization applications in mobile communication and satellite communication.