Design of a Polarization Multiplexed Focused Huygens Metasurface
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摘要: 针对无源超表面功能单一的问题，该文提出一款极化复用的透射型惠更斯超表面，可实现x极化和y极化入射波的独立聚焦特性。超表面单元由一层厚度为0.17λ的介质基板和位于两侧的不对称电偶极子元件组成，利用反向流动的表面电流构成磁偶极子，在物理结构上消除了磁性元件的需求，使单元更加紧凑。通过单元结构尺寸的调整，实现双极化独立调控和360°相位覆盖。根据双极化聚焦的效果设定，基于全息理论对单元进行排列，设计并制备出在35 GHz下具有独立聚焦特性的极化复用惠更斯超表面，模拟和实测结果基本一致。所提出的惠更斯超表面无多层堆叠和金属过孔，具有结构简单、低剖面、易加工等特点。Abstract: In order to solve the problem of single function of passive metasurface, a polarization multiplexed transmission Huygens metasurface is proposed, which realizes the independent focusing characteristics of x-polarized and y-polarized incident waves. The metasurface unit consists of a pair of asymmetrical electric dipole elements and a dielectric substrate with a thickness of 0.17 λ. Magnetic dipole is formed by surface current flowing in reverse direction, which eliminates the need for magnetic element in physical structure and makes the unit more compact. Dual-polarization independent control and 360° phase coverage are achieved by adjusting the dimensions of unit. Aligning Huygens particles based on holographic theory, a polarization multiplexed Huygens metasurface with independent focusing characteristics at 35 GHz is designed and fabricated. The measured results are basically consistent with the simulations. The proposed Huygens metasurface has no multilayer stacking and metal via, and has the characteristics of simple structure, low profile, and easy processing.
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Key words:
- Huygens metasurface /
- Polarization-multiplexed /
- Focused /
- Holographic theory
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