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相关概念视频

Cascaded Op Amps01:16

Cascaded Op Amps

627
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
627
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

771
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
771
Parallel Resonance01:23

Parallel Resonance

207
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
207
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

254
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:
254
Maximum Power Transfer01:16

Maximum Power Transfer

253
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...
253
Series Resonance01:17

Series Resonance

174
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
174

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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用于多频段操作的天线提升元件.

Elena García1, Aurora Andújar1, Jaume Anguera1,2

  • 1Ignion, 08174 Barcelona, Spain.

Sensors (Basel, Switzerland)
|May 11, 2024
PubMed
概括

这项研究优化了用于物联网 (IoT) 设备的天线助推元件,使多带运行能够在减少的物理约束范围内运行. 该设计在低频和高频范围内实现了高效的性能,这对于紧的无线应用至关重要.

科学领域:

  • 电气工程 电气工程
  • 天线设计天线设计
  • 无线通信无线通信

背景情况:

  • 对多功能无线设备的日益增长的需求需要更小的天线足迹.
  • 将多个功能集成到紧型设备中,对天线设计师来说是一个挑战.
  • 物联网 (IoT) 应用程序需要在严格的物理限制内使用多带天线.

研究的目的:

  • 为了优化天线助推元件的多频段性能.
  • 为应对设计用于物联网设备的紧天线的挑战.
  • 为了在指定的低频和高频范围内实现高效运行.

主要方法:

  • 设计和优化带排斥过器与天线增强元件集成.
  • 理论分析以提高低频范围 (LFR) 和高频范围 (HFR) 的带宽.
  • 一个原型印刷电路板 (PCB) 天线的制造和测试.

主要成果:

  • 优化的天线增强元件覆盖了LFR (698-960 MHz) 和HFR (1710-2690 MHz).
  • 拟议的PCB天线尺寸为142mm × 60mm,具有30mm × 3mm × 1mm的紧增压元件.
  • 理论分析成功指导了优化以改善带宽.
关键词:
物联网 (IoT) 的物联网 (IoT) 的物联网.增强天线的助推器.天线设计天线设计.匹配网络的网络匹配.多频带天线天线无线设备是无线设备.

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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结论:

  • 开发的天线助推元件有效支持小型无线设备的多频段操作.
  • 设计验证了在有限的尺寸内实现所需频率覆盖的可行性.
  • 原型证实了分析结果,证明了对物联网天线挑战的实际解决方案.