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相关概念视频

Plane Electromagnetic Waves I01:30

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed...
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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.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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相关实验视频

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实时毫米波频道响应通过交换束形状与3D双极化相位阵列天线.

Derek Caudill1, Jack Chuang2, Sung Yun Jun1

  • 1RF Technology Division, National Institute of Standards and Technology, Boulder, CO 80305 USA.

IEEE transactions on microwave theory and techniques
|June 13, 2024
PubMed
概括

研究人员开发了一种新的毫米波频道探测器,使用转换波束成形与相位阵列. 这种实时系统可以实现高精度的3D通道测量,估计误差最小.

关键词:
285GHz的频率是285GHz的频率.5G是什么意思? 5G是什么意思?校准 校准 校准 校准 校准 校准频道声波器 频道声波器毫米波 (mmWave) 是一种毫米波.传播传播传播的传播

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科学领域:

  • 电气工程 电气工程
  • 无线通信无线通信
  • 信号处理 信号处理

背景情况:

  • 毫米波 (mmWave) 频率对于下一代无线系统至关重要,因为它们的带宽很大.
  • 准确的通道探测对于理解和建模毫米波传播环境至关重要.
  • 传统的相位阵列光束成型通常依赖于模拟重量,这可能是耗时和不精确的.

研究的目的:

  • 推出一种新的28.5GHz频道声波器,利用切换波束成形与相位阵列.
  • 为了实现实时,高分辨率的3D频道响应在毫米波频谱.
  • 在速度和精度方面克服模拟光束成型的局限性.

主要方法:

  • 实现一个28.5GHz频道声波器与多个双极化8x8相控阵列.
  • 在后处理中开发使用数字权重的切换束成形技术.
  • 集成稳定的鲁比时钟,局部振荡器和内部无线校准.
  • 在1.3毫秒内实现3D双通向,双极化通道扫描.

主要成果:

  • 通过规避模拟重量编程,实现实时通道响应.
  • 使用数字权重高精度合成理想的光束图案.
  • 证明了对硬件非理想性和侧叶抑制的精细重量校准.
  • 报告的平均估计误差为0.47°的角度,0.48dB的路径增益和0.18ns的延迟.

结论:

  • 使用相位阵列的交换波束成形为毫米波频道探测提供了一种可行和高效的方法.
  • 拟议的系统为3D通道表征提供了前所未有的准确性和速度.
  • 这种技术可以精确建模和优化未来的高频无线通信系统.