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相关概念视频

The Antenna Complex01:15

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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Dimensional analysis, also known as the factor label method, is a versatile approach for mathematical operations. The main principle behind this approach is: the units of quantities must be subjected to the same mathematical operations as their associated numbers. This method can be applied to computations ranging from simple unit conversions to more complex and multi-step calculations involving several different quantities and their units.
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Dimensional analysis is a valuable technique in fluid mechanics for simplifying complex problems by reducing them into dimensionless groups. These groups capture the essential relationships between the variables involved, allowing researchers and engineers to analyze fluid flow without dealing with each variable individually. This approach reduces the number of independent variables, allowing for easier analysis and better understanding of physical phenomena.
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The signs and symptoms of fever include hot and dry skin, flushed face, thirst, muscle aches, anorexia, headache, tachycardia, tachypnea, and fatigue. Elevated body temperature is reduced using two methods: pharmacological and nonpharmacological. Proper identification and treatment of the root cause of a fever is of utmost importance.
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Updated: Feb 5, 2026

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减小尺寸的天线阵列用于光束成型/转向.

Shiyi Xia1, Mingyang Zhao2, Qian Ma3

  • 1Electrical Engineering Department, Eindhoven University of Technology, NL 5600 MB, Eindhoven, Netherlands.

Communications engineering
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概括
此摘要是机器生成的。

这项研究引入了一种缩小尺寸的级联偏移角度相位阵列 (DRCAO-PAA),以实现高效的梁成型. 这种新的设计大大减少了主动控制器,使得在卫星和深空通信领域的先进应用成为可能.

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科学领域:

  • 电气工程 电气工程
  • 电磁学 电磁学 电磁学 电磁学
  • 天线理论天线理论

背景情况:

  • 波束成形使得使用电磁波在各种领域实现有针对性的通信.
  • 传统的相位数组需要许多主动控制器,导致高功耗和复杂性.
  • 减少主动控制器对于将光束成形扩展到卫星和深空应用至关重要.

研究的目的:

  • 提出一种新的阶段阵列天线设计,减少主动控制器的数量.
  • 为了保持梁转向性能,同时最大限度地降低硬件复杂性.
  • 为了实现先进的光束成形应用在卫星和深空通信.

主要方法:

  • 开发了一个缩小尺寸的级联角度偏移相位阵列 (DRCAO-PAA).
  • 应用单数值分解 (SVD) 来压缩相位移系数矩阵.
  • 集成的粒子群优化和深度神经网络转换器用于实际应用.
  • 为理论验证建造了一个实验板.

主要成果:

  • 证明了对光束转向的主动控制器的显著减少.
  • 实现了对16/8/4元组的光束转向,分别仅使用4/3/2主动控制器.
  • 通过实验结果验证了DRCAO-PAA设计.

结论:

  • DRCAO-PAA设计有效地减少了对阶段阵列的主动控制器要求.
  • 这种方法克服了传统光束成形的局限性,为复杂的通信系统铺平了道路.
  • 该方法为卫星和深空探索中的高级光束成形提供了实用解决方案.