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相关概念视频

Maximum Power Transfer01:16

Maximum Power Transfer

265
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...
265
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

260
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
260
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

140
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...
140
Power Factor Correction01:20

Power Factor Correction

183
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.
183
Induced Electric Dipoles01:28

Induced Electric Dipoles

4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K
Clipper Circuit01:18

Clipper Circuit

456
A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
456

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相关实验视频

Updated: Jul 12, 2025

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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高定向性和紧的微条带合器用于射频功率应用.

Cheng-Hsuan Chan1, Tsung-Chi Yu2, Tsun-Hsu Chang1

  • 1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan.

The Review of scientific instruments
|October 20, 2023
PubMed
概括

开发了一种新的紧型微条带定向合器,用于监控高功率放大器模块. 该设备提供宽带宽和高导向性,在要求高的无线电频率应用中有效.

科学领域:

  • 电气工程 电气工程
  • 无线电频率 (RF) 工程

背景情况:

  • 高功率固态发射器需要精确监控放大器模块性能.
  • 现有的电源监控解决方案可能缺乏紧性,宽带宽或温度稳定性.

研究的目的:

  • 设计,制造和测试用于监控千瓦级放大器模块的紧型微带定向合器.
  • 在不同的功率水平下,评估合器在合,定向性,插入损失和带宽方面的性能.

主要方法:

  • 采用了具有反向合方案的多段合线路结构.
  • 使用具有良好的终端的双侧配置来增强导向性和带宽.
  • 为了评估性能特征,进行了低功率和高功率 (1千瓦) 的测试.

主要成果:

  • 合器显示了37.69 dB的合,在广泛的频率范围 (82-700 MHz) 中具有高定向性.
  • 在不同的功率水平下,合在499.65 MHz保持稳定.
  • 在1kW输入功率下,定向率为33.85dB,最大插入损失为0.08dB.

结论:

  • 设计的微条带定向合器是紧的,提供高定向性和宽带宽,适用于高功率的射频应用.
  • 该设备具有良好的温度稳定性,因为没有零件.

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  • 它的性能使得它非常适合监控固态发射器中的kW级放大器模块,特别是在低频应用中.