一种旋转圆极化阵元产生OAM波束的圆形阵设计方法

A circular array design approach for generating OAM beams by rotating circularly polarized elements

根据电磁理论推导提出了一种依次旋转天线阵中的圆极化阵元产生OAM波束的方法。然后,给出了一个八单元宽频带圆极化圆形阵的设计实例。在设计实例中,通过对所有阵元沿顺时针(或逆时针方向)依次旋转一定角度,可以生成模式数l=0,±1,±2,±3的OAM波束。与现有文献采用的控制阵元间馈电相位差来产生OAM波束的方法不同,本方法中所有阵元馈电相位相同,这不仅有利于OAM天线系统简化馈电网络设计,而且避免了由阵元间相移器引入的相位误差。

Derived from the electromagnetic theory,a method of generating OAM beams by circularly-polarized(CP)array elements in a rotating antenna array was proposed.And the example of circular array design consisting of eight broadband dual-CP element was presented.In this example,OAM beams with modes l=0,±1,±2,±3 could be generated by sequentially rotating all of the elements at a certain angle.Different from the previous literature,in which OAM is generated by phased circular arrays,all of the elements in this design are fed with the same phase,resulting in simplified design of the feeding network in antenna system.Meanwhile,the phase errors resulting from inter-element phase shifters can be avoided.