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相关概念视频

Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Maximum Power Transfer01:16

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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...
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Power Factor Correction01:20

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The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
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The Power Superposition Principle01:19

The Power Superposition Principle

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Consider a circuit with two sinusoidal voltage sources. Each one influences the circuit independently, and the superposition principle helps us understand the combined effect by adding up the responses from each source.
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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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Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
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相关实验视频

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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基于STAR数字阵列多接收器电源抑制的传输束成形设计.

Tairan Lin1, Xizhang Wei1, Jingtong Lai1

  • 1Department of Electronics and Communication Engineering, Sun Yat-sen University, Guangming District, Shenzhen 518107, China.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
概括

本研究介绍了一种针对同时发射和接收 (STAR) 系统的优化发射束成形方法. 该技术有效地抑制了自我干扰,增强了信号完整性,并使低分辨率的模拟数字转换器 (ADC) 成为可能.

关键词:
多个接收器多个接收器.阶段式数组数组是一个阶段式数组数组.功率放大器 的功率放大器.辐射功率是辐射的功率.同时发送和接收.传输成型光束的传输.

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相关实验视频

Last Updated: Jul 5, 2025

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科学领域:

  • 电磁工程 电磁工程 电磁工程
  • 信号处理 信号处理
  • 无线通信系统无线通信系统

背景情况:

  • 同时发送和接收 (STAR) 阵列系统提供了增强的辐射收益和数据速率.
  • 在STAR阵列中的相互合在抑制接收元件的自我干扰功率方面存在重大挑战.
  • 高的自我干扰可以和接收链接,并扭曲所需的感兴趣信号 (SoI).

研究的目的:

  • 为STAR阵列系统提出一个优化的传输束成形方法.
  • 通过自适应光束成形来最大限度地减少接收元件的自我干扰功率.
  • 为了减轻由模拟数字转换器 (ADC) 引起的数字SoI的扭曲.

主要方法:

  • 开发了一种优化的发射束成形策略,包括辐射功率限制和发射功率控制.
  • 采用自适应式发射束成形,以实现发射和接收阵列之间的高隔离.
  • 利用HFSS设计和模拟一个32个元素的二维相位阵列.

主要成果:

  • 在模拟的相位阵列中实现了超过100dB的有效同位素隔离 (EII).
  • 在接收通道的最大事件自我干扰功率降低了大约35dB.
  • 证明有效控制发射增强减弱和改进接收子阵列隔离.

结论:

  • 优化的传输束成形方法有效地抑制了STAR系统中的自我干扰.
  • 这种方法可以防止SoI扭曲,特别是在具有有限位ADC的系统中.
  • 该方法在子阵列隔离方面具有优势,并允许更低的ADC精度要求.