基于UCA的涡旋波对称性破缺
Symmetry Breaking in UCA-Based Vortex Waves
摘要：
在文献中，经常提到由足够数量的辐射单元组成的均匀圆阵（UCA）能够产生具有任意拓扑荷的涡旋波。虽然提供了一种非常简单和直观的解决方案，而不需要任何合成方法，但通过渐进相移的方式激励UCA并不总是保证正确地产生涡旋波，因为构成阵列的每个单独元件的对称性和辐射特性起主要作用。当UCA用于涡流通信链路时，这些对称性强烈影响信道模式的正交性，从而影响通信效率。在这项工作中，对称性破缺与涡波的辐射UCA及其对模式正交性的影响进行了详细的探讨。
英文摘要：
In literature, it is often said that a uniform circular array (UCA) composed of a sufficient number of radiating elements is able to generate a vortex wave with arbitrary topological charge. While providing a very simple and intuitive solution without the need for any synthesis method, the excitation of UCAs by means of a progressive phase shift does not always guarantee that vortex waves are correctly generated, since a major role is played by the symmetry and radiation properties of each individual element which constitutes the array. When the UCAs are employed in vortex communication links, these symmetry properties strongly affect the orthogonality of the channel modes and, therefore, the communication efficiency. In this work, the symmetry breaking associated with the radiation of vortex waves by UCAs and its impact on the mode orthogonality are explored in detail.
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