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相关概念视频

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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相关实验视频

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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通过1位可编程超表面天线生成多模式OAM光束.

Morteza Nadi1, Seyed Hassan Sedighy2, Ahmad Cheldavi1

  • 1School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran.

Scientific reports
|September 21, 2023
PubMed
概括

这项研究引入了一种新的1位可编程超表面天线,用于生成高效,动态的多模式轨道角动量 (OAM) 束. 这一创新提高了现代无线通信系统的通道容量.

科学领域:

  • 电磁学 电磁学 电磁学 电磁学
  • 无线通信无线通信
  • 超材料是什么?超材料是什么?

背景情况:

  • 轨道角动量 (OAM) 束对于提高无线通信中的通道容量至关重要.
  • 现有的用于OAM光束生成的可编程元表面由于反射/传输模式而受到低光圈效率的影响.
  • 需要有效和动态的OAM光束生成方法.

研究的目的:

  • 提出一种新的1位可编程超表面天线.
  • 为了实现高效和动态的多模式OAM光束生成.
  • 为了克服当前OAM光束生成技术的局限性.

主要方法:

  • 使用由PIN二极管加载的电子可重新配置的元辐射元件,用于双相电场状态.
  • 使用现场可编程网关数组 (FPGA) 进行实时代码序列分配.
  • 制造和测量超表面天线以验证性能.

主要成果:

  • 展示了一个1位可编程的超表面天线,能够产生动态的多模式OAM光束.
  • 通过克服溢出和照明效应,实现了高光圈效率.
  • 实验测量证实了对各种OAM状态的全波模拟的一致性.

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结论:

  • 拟议的超表面天线为生成多模式OAM光束提供了一个有能力的替代方案.
  • 这项技术适用于高通量毫米波 (mm-wave) 通信系统.
  • 通过可编程元表面对OAM束进行动态控制,为无线通信开辟了新的途径.