在28 GHz实验链路上观察到的OAM波束的自愈效应
Self-Healing Effects in OAM Beams Observed on a 28 GHz Experimental Link
AI总结：
本文首次在28 GHz室外毫米波实验链路上观察到了OAM无线电波束的自愈效应，证实该效应随OAM阶数增加而增强。
摘要：
本文首次记录了在室外视距（LOS）场景下的毫米波实验通信链路上观察到的自愈效应的一些影响，自愈效应是轨道角动量（OAM）或涡旋波束的一种特性。OAM波束具有螺旋相位和极化结构，并在远场呈圆锥形振幅形状。OAM波束的坡印廷矢量也具有螺旋结构，与相应的螺旋相位波前正交。由于在垂直于波束轴的方向上具有这种非平面结构，OAM波束是结构光波束的一个子集。已知这种结构波束在沿其传播轴部分受阻时，特别是在其近场中，具有自愈特性，从而在沿其波束轴的更远距离处部分重建其结构。已经提出了各种理论依据，以使用各种类型的障碍物和实验技术来解释、建模和实验验证结构光波束中的自愈物理效应。基于这些模型，我们假设观察到的任何自愈效应都会随着OAM阶数的增加而增强。在这里，我们首次在结构化OAM无线电波束中观察到了自愈效应，其观察依据是通信信号和信道参数，而不是波束结构。我们捕获了不同阶数的OAM波束的近场部分阻挡对通信信号的影响，并提供了物理依据来证实观察到的自愈效应随OAM阶数的增加而增强，这与我们的假设一致。
英文摘要：
In this paper we document for the first time some of the effects of self-healing, a property of orbital-angular-momentum (OAM) or vortex beams, as observed on a millimeter-wave experimental communications link in an outdoors line-of-sight (LOS) scenario. The OAM beams have a helical phase and polarization structure and have conical amplitude shape in the far field. The Poynting vectors of the OAM beams also possess helical structures, orthogonal to the corresponding helical phase-fronts. Due to such non-planar structure in the direction orthogonal to the beam axis, OAM beams are a subset of structured light beams. Such structured beams are known to possess self-healing properties when partially obstructed along their propagation axis, especially in their near fields, resulting in partial reconstruction of their structures at larger distances along their beam axis. Various theoretical rationales have been proposed to explain, model and experimentally verify the self-healing physical effects in structured optical beams, using various types of obstructions and experimental techniques. Based on these models, we hypothesize that any self-healing observed will be greater as the OAM order increases. Here we observe the self-healing effects for the first time in structured OAM radio beams, in terms of communication signals and channel parameters rather than beam structures. We capture the effects of partial near-field obstructions of OAM beams of different orders on the communications signals and provide a physical rationale to substantiate that the self-healing effect was observed to increase with the order of OAM, agreeing with our hypothesis.
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