Experimental demonstration of conformal phased array antenna via transformation optics.
Experimental demonstration of conformal phased array antenna via transformation optics.
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通过变换光学器件进行共形相控阵天线的实验演示
DOI：
10.1038/s41598-018-22165-4
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发表时间：
2018-02-28
影响因子：
4.6
通讯作者：
Hao Y
中科院分区：
文献类型：
--
作者：
Lei J;Yang J;Chen X;Zhang Z;Fu G;Hao Y
变换光学是一种设计新型电磁器件的通用技术，在与一般波动方程相关的许多学科领域都有广泛的应用。其中，准共形变换光学（QCTO）可以用来最小化变换介质的各向异性，并开辟了可能性，以设计具有任意几何形状的宽带天线。本文设计了一种基于全介质QCTO透镜的宽角扫描共形相控阵天线，并进行了实验验证。在与传统平面阵列相同的电流分布激励下，采用QCTO透镜的共形系统可以保持与平面阵列相同的辐射特性，具有宽角度波束扫描和低旁瓣电平。采用满足Dirichlet-Neumann边界条件的拉普拉斯方程来构造虚拟空间和物理空间之间的映射。在有效参数近似下，利用全介质多孔结构实现了具有梯度折射率的各向同性透镜。实验结果表明，该系统具有良好的广角光束扫描性能。这样的演示铺平了道路，一个强大的，但有效的阵列综合，以及多波束和波束形成共形阵列通过变换光学实现。
Transformation Optics has been proven a versatile technique for designing novel electromagnetic devices and it has much wider applicability in many subject areas related to general wave equations. Among them, quasi-conformal transformation optics (QCTO) can be applied to minimize anisotropy of transformed media and has opened up the possibility to the design of broadband antennas with arbitrary geometries. In this work, a wide-angle scanning conformal phased array based on all-dielectric QCTO lens is designed and experimentally demonstrated. Excited by the same current distribution as such in a conventional planar array, the conformal system in presence of QCTO lens can preserve the same radiation characteristics of a planar array with wide-angle beam-scanning and low side lobe level (SLL). Laplace’s equation subject to Dirichlet-Neumann boundary conditions is adopted to construct the mapping between the virtual and physical spaces. The isotropic lens with graded refractive index is realized by all-dielectric holey structure after an effective parameter approximation. The measurements of the fabricated system agree well with the simulated results, which demonstrate its excellent wide-angle beam scanning performance. Such demonstration paves the way to a robust but efficient array synthesis, as well as multi-beam and beam forming realization of conformal arrays via transformation optics.
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