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相关概念视频

The Antenna Complex01:42

The Antenna Complex

6.0K
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...
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The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

663
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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Maximum Power Transfer01:16

Maximum Power Transfer

292
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
292
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

396
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
396

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相关实验视频

Updated: Jul 23, 2025

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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为足迹模式最大化天线阵列孔径效率.

Cibrán López-Álvarez1, María Elena López-Martín2, Juan Antonio Rodríguez-González3

  • 1Center for Research in NanoEngineering, Campus Diagonal-Besòs, Polytechnic University of Catalonia, 08019 Barcelona, Spain.

Sensors (Basel, Switzerland)
|July 11, 2023
PubMed
概括

最大限度地提高天线孔径效率,可以减少辐射元件的数量,从而产生更具指令性和成本效益的天线. 本研究提供了用于计算各种天线足迹的光圈效率的方法.

关键词:
天线阵列的光圈孔口.足迹模式 足迹模式模式合成模式合成

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科学领域:

  • 天线理论和设计.
  • 电磁学 电磁学 电磁学 电磁学
  • 卫星通信 卫星通信

背景情况:

  • 孔径效率是一个关键的,但在天线设计中经常被忽视的参数.
  • 天线的成本和导向性受辐射元素的数量直接影响.
  • 优化光圈效率可以显著提高天线性能和经济性.

研究的目的:

  • 为了证明最大化光圈效率可以减少天线所需的辐射元件的数量.
  • 为优化设计,建立天线光圈边界和半功率光束宽度之间的关系.
  • 提供用于计算特定天线足迹的光圈效率的方法,包括现实的场景.

主要方法:

  • 基于光束宽度的光圈效率的数学表达式的推导.
  • 从一个平顶光束图案中合成一个长方形天线足迹,面积比为2:1.
  • 对不对称覆盖模式的天线轮和光圈效率的数值计算.

主要成果:

  • 在最大化光圈效率和减少辐射元素数量之间发现了直接的相关性.
  • 开发了一种方法来计算矩形足迹的光束宽度的光圈效率.
  • 该研究成功计算了对不对称覆盖模式的天线轮和光圈效率.

结论:

  • 最大限度地提高光圈效率是开发更多指令和经济天线的关键.
  • 提出的数学框架允许设计具有特定光束宽度特征的天线.
  • 这些发现适用于各种天线设计,包括用于具有不对称覆盖要求的卫星通信的天线.