Laboratory of Applied Research On Electromagnetics (ARE), College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, 310027, China.
Beijing Engineering Research Center of EMC and Antenna Measurement, Beijing, 100094, China.
Sci Rep. 2023 Apr 17;13(1):6222. doi: 10.1038/s41598-023-33446-y.
In this study, a dual-polarized and dual band reflective Fresnel zone plate with reconfigurable beam is proposed on the basis of fractal frequency selective surface (FSS) unit with nearly 360° phase tunability. Firstly, a new phase distribution calculation strategy based on Fresnel diffraction theory is proposed to improve the performance under certain scenarios like sparse arrays. Then, a novel fractal shape is put forward and applied to the design of the Fresnel zone plate. The introduction of the fractal structure makes the unit cell perform dual band, dual polarization and 309° phase tunability characteristics. Due to the self-symmetry of the unit cell, the proposed fractal Fresnel zone plate (FFZP) is capable of beam steering in ± 45° in both TE and TM incident waves. Besides, the proposed structure shows small performance degradation when it comes to oblique incidence up to 45°, which decreases the focal diameter ratio and profile of the proposed FFZP. The operating bandwidth of the FFZP can reach up to 700 MHz at X and Ku bands. It is applicable in a wide range of RF and microwave settings such as satellite and base station.
本研究基于具有近 360°相位可调性的分形频率选择表面（FSS）单元，提出了一种具有可重构波束的双极化双频反射菲涅尔带板。首先，提出了一种新的基于菲涅尔衍射理论的相位分布计算策略，以提高在稀疏阵列等特定场景下的性能。然后，提出了一种新的分形形状，并将其应用于菲涅尔带板的设计中。分形结构的引入使单元具有双频、双极化和 309°相位可调性的特点。由于单元的自对称性，所提出的分形菲涅尔带板（FFZP）能够在 TE 和 TM 入射波中实现±45°的波束转向。此外，当斜入射角度达到 45°时，所提出的结构性能下降较小，这降低了所提出的 FFZP 的焦距比和轮廓。FFZP 的工作带宽在 X 波段和 Ku 波段可达到 700 MHz。它适用于卫星和基站等广泛的射频和微波应用。
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