论文标题
使用以荟萃启发的半分析方法来消除波导弯曲中的反射
Eliminating Reflections in Waveguide Bends Using a Metagrating-Inspired Semianalytical Methodology
论文作者
论文摘要
我们提出了一种半分析方法，可以使用单个无源极化元件（散射器）在单模矩形波导中跨突出的H平面弯曲获得完美的传播。基础分析和合成方案的启发是受到对Metagratings的快速增长的研究的启发，该研究通常用于操纵自由空间的波浪轨迹。这些稀疏的次波长极化颗粒（元原子）的稀疏构型是通过仔细剪裁元素间近场和远场相互作用而设计的，依靠分析模型来解决所需的元原子分布和几何形状，以促进入射波激发时所需的干扰模式。利用这些Metagration设计概念，我们开发了一种模态形式主义，以获取弯头交界处的位置集合，其中可以将被动散射器放置为零，以零回报损失。随后，我们为散射器提出了两种不同的形状，并讨论了每个散射器的几何特征。通过全波模拟验证的这种多功能和有效的方法可以用来消除各种弯曲构型的反射损失，这通常在用于天线馈电和发电的复杂波芯系统中发现。此外，这些结果证明了除了自由空间光束操纵之外的元设计概念对各种应用的有用性和潜力。
We present a semianalytical method to obtain perfect transmission across abrupt H-plane bends in single-mode rectangular waveguides using a single passive polarizable element (scatterer). The underlying analysis and synthesis schemes are inspired by the rapidly-growing research on metagratings, typically used to manipulate wave trajectories in free-space. These sparse configurations of subwavelength polarizable particles (meta-atoms) are designed by careful tailoring of inter-element near-field and far-field interactions, relying on analytical models to resolve the required meta-atom distribution and geometry to facilitate a desired interference pattern when excited by the incident wave. Utilizing these metagrating design concepts, we develop a modal formalism for obtaining a collection of locations inside the bend junction, in which a passive scatterer may be placed to zero out the return loss. Subsequently, we propose two different shapes for the scatterer and discuss, for each of them, the ways in which their geometrical characteristics may be retrieved. This versatile and efficient methodology, verified via full-wave simulations, can be utilized to eliminate reflection loss in diverse bend configurations, often found in complex wave-guiding systems used for antenna feeding and power transmission. Moreover, these results demonstrate the usefulness and potential of metagrating design concepts for various applications, beyond free-space beam manipulation.
