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相关概念视频

Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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双模圆角天线与2-D亚齐图斯单脉冲图案,用于毫米波应用.

Asrin Piroutiniya1, Mohamad Hosein Rasekhmanesh1, José Luis Masa-Campos1

  • 1Group of RadioFrequency: Circuits, Antennas and Systems (RFCAS), Escuela Politécnica Superior, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

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概括

一个新的双模圆角天线 (DM-CHA) 集成一个双模转换器 (DMC) 与一个圆角天线 (CHA) 用于5G毫米波应用. 该系统可用于卫星通信中高数据速率的精确角度检测.

关键词:
5G是什么意思? 5G是什么意思?这是K乐队.圆形的角形天线这是一个双模式转换器.毫米波应用的应用.模式转换器模式转换器一个脉冲的单脉冲.

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科学领域:

  • 电磁学和波浪传播
  • 天线理论和设计.
  • 毫米波技术的技术.

背景情况:

  • 5G通信系统需要用于毫米波频率的先进天线解决方案.
  • 单脉冲操作对于雷达和通信系统中准确的角度检测至关重要.
  • 现有的天线系统在K频段实现高增益和高效模式转换方面面临着挑战.

研究的目的:

  • 为了展示一个新的三维全金属系统,双模圆角天线 (DM-CHA).
  • 将双模式转换器 (DMC) 与形喇天线 (CHA) 集成,用于K频段 (37.5-39 GHz) 的单脉冲操作.
  • 通过增强的到达角检测,实现高数据速率的5G卫星通信.

主要方法:

  • 双模式转换器 (DMC) 的设计是为了在CHA的圆形波导中激发特定的模式 (TE11cir或TE01cir).
  • 该DMC是使用计算机数控 (CNC) 减法制造制造的.
  • 圆角天线 (CHA) 使用直接金属激光烧结 (DLMS) 增材制造来制造.
  • 集成的DM-CHA系统经过了严格的测试,对关键性能指标的模拟和测量结果进行了比较.

主要成果:

  • 制造的DM-CHA系统成功地辐射了单脉冲操作的总和 (Σ) 和差异 (Δ) 模式.
  • 整合阻止了更高阶模式传播和模式相互合.
  • 该系统在到达检测的角度上显示每束高达±11°.
  • 通过模拟和测量验证了回报损失,隔离,辐射模式和收益.

结论:

  • 新的DM-CHA系统为5G毫米波应用提供了可行的解决方案.
  • 用先进的制造技术制造的DMC和CHA的组合实现了有效的单脉冲操作.
  • 该系统在角探测方面的性能支持未来卫星通信的高数据速率要求.