一种用于产生OAM波束的集成圆极化天线阵列

An integrated circularly polarized antenna array for generating OAM beams

摘要:

提出了一种在S波段内产生轨道角动量（OAM）波束的集成圆极化微带天线阵列.天线采用同轴馈电的方式.为了获得良好的圆极化特性，利用CST软件对天线结构参数进行了仿真优化分析，最终确定天线整体尺寸为0.416λ_0×0.416λ_0×0.026λ_0，3-dB轴比带宽为3.79~3.85GHz，S11 < -10dB的工作带宽为3.74~3.96GHz.该天线结构简单紧凑，易于实现.天线阵列由六个相同的圆极化天线组成，相邻阵列单元沿顺时针方向旋转60度，通过仿真和实验结果得知，在对阵元进行等幅、等相位的馈电的条件下，该天线阵列能够产生模态l = -1的OAM波束，这能够有效避免复杂馈电网络结构的设计.

Abstract:

An integrated circularly polarized (CP) microstrip antenna array for generating orbital angular momentum (OAM) beams at S band is presented， which adopts coaxial feeding. To obtain excellent polarization performance, the parameters of the antenna structure are simulated and optimized by the CST software, then the overall size of proposed antenna is 0.416λ0×0.416λ0×0.026λ0, the 3dB axial ratio (AR) bandwidth is 3.79~3.85 GHz and S11＜-10 dB bandwidth is 3.74~3.96 GHz. The proposed antenna has simple and compact structure, which is easy to implement. The antenna array consists of six identical CP elements that rotate 60 degrees clockwise sequentially. According to the simulated and measured results, the proposed antenna array can generate OAM beams with mode l = -1 under the condition of same amplitude and phase feeders, which can effectively avoid the design of complex network structure.