模态波束双可重构OAM发生器的研究

针对圆环形阵列天线产生轨道角动量(orbital angular momentum, OAM)涡旋波的技术, 提出了宽带圆极化单臂螺旋天线(single-arm spiral antenna, SASA)构成的机械可重构圆环形阵列天线, 并深入研究了OAM涡旋波的模态检测和收发情况.利用SASA的相位特性, 调控各阵元绕自身轴线的旋转角度, 可灵活控制OAM涡旋波的主波束辐射方向.该设计可实现OAM模态和涡旋波辐射方向双可重构调控特性, 并根据SASA的旋转角方向实现左旋圆极化或右旋圆极化OAM涡旋波.实验加工并测试了该可重构圆环形OAM阵列天线, 验证了该思想和方法的正确性和有效性.

Reconfigurable orbital angular momentum generator with vortex beam direction and mode adjustment

The mode detection and transmission of the orbital angular momentum vortex wave are studied intensively on the basis of the proposed mechanically reconfigurable circular array antenna which consists of broadband and circular polarization single-arm spiral antenna (SASA) allowing self-rotation around the axis to produce a relative change in phase of the radiated field in space. Furthermore, the main beam direction of the orbital angular momentum(OAM) vortex wave can be flexibly controlled by adjusting the rotation angle of each array element around its axis according to the phase characteristics of the SASA. The proposed design can realize the vortex beam direction and OAM mode reconfigurability. In addition, the left-hand circular polarization or right-hand circular polarization vortex wave can be adjusted by changing the rotation angle of the SASA. The prototype of the circular array is proposed, fabricated, and measured to validate the effectiveness and correctness of the proposed method.