Radiation-Type Programmable Metasurface for Direct Manipulation of Electromagnetic Emission,Laser & Photonics Reviews

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Radiation-Type Programmable Metasurface for Direct Manipulation of Electromagnetic Emission
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-08-07 , DOI: 10.1002/lpor.202200140
Xudong Bai _{1,

2} , Fuli Zhang _{1,

3} , Li Sun ₁ , Anjie Cao ₄ , Xiaojun Wang ₂ , Fanwei Kong ₂ , Jin Zhang ₅ , Chong He ₅ , Ronghong Jin ₅ , Weiren Zhu ₅ , Tie Jun Cui ₆

Affiliation

Programmable metasurfaces enable fine-grained real-time modulation over electromagnetic (EM) waves in a digital manner, which have gained remarkable attention in antenna engineering and wireless communications. However, either a reflective or transmissive programmable metasurface requires an external feed source with significant distance to the metasurface, making the whole programmable device a relatively high profile as well as low efficiency as a result of the feed spillover losses. In this paper, an innovative design of radiation-type programmable metasurface for dynamic modulation of radiant EM wave is presented, which perfectly combines the functions of 1-bit phase shifter and efficient power radiator in the single unit framework. By employing the integrated series-parallel hybrid microstrip network to stimulate the topside metasurface units, versatile capacities, including dynamic beam scanning and multimode vortex beam generation, are verified both numerically and experimentally. Due to the direct-radiation characteristic of the metasurface design, the programmable metasurface possesses the aperture efficiency over 30% and a low profile reduced by almost two orders of magnitude, when comparing with the conventional reflective or transmissive programmable metasurfaces illuminated by the external feeds. The proposed design can offer a novel approach of programmable metasurface framework in dynamic radiant EM modulation for low-profile conformal applications.

中文翻译：

用于直接操纵电磁发射的辐射型可编程超表面

可编程超表面能够以数字方式对电磁 (EM) 波进行细粒度实时调制，这在天线工程和无线通信中引起了极大的关注。然而，无论是反射式还是透射式可编程超表面都需要一个与超表面有很远距离的外部馈电源，这使得整个可编程设备的外形相对较高，但由于馈电溢出损失，效率较低。在本文中，提出了一种用于辐射电磁波动态调制的辐射型可编程超表面的创新设计，它在单个单元框架中完美地结合了 1 位移相器和高效功率辐射器的功能。通过采用集成的串并联混合微带网络来刺激顶部超表面单元，多种功能，包括动态光束扫描和多模涡旋光束生成，都在数值和实验上得到了验证。由于超表面设计的直接辐射特性，与外部馈源照明的传统反射或透射可编程超表面相比，可编程超表面具有超过 30% 的孔径效率和降低近两个数量级的低剖面。所提出的设计可以为低剖面共形应用的动态辐射 EM 调制提供一种可编程超表面框架的新方法。与由外部馈电照明的传统反射或透射可编程超表面相比，可编程超表面具有超过 30% 的孔径效率和减少近两个数量级的低剖面。所提出的设计可以为低剖面共形应用的动态辐射 EM 调制提供一种可编程超表面框架的新方法。与由外部馈电照明的传统反射或透射可编程超表面相比，可编程超表面具有超过 30% 的孔径效率和减少近两个数量级的低剖面。所提出的设计可以为低剖面共形应用的动态辐射 EM 调制提供一种可编程超表面框架的新方法。

更新日期：2022-08-07

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