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Generating Electromagnetic Radiations01:10

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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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A half-wave rectifier is a fundamental circuit in electronics, designed to convert alternating current (AC) voltage into a unidirectional voltage. It utilizes the simplest form of diode rectification, where the circuit comprises a single diode in series with a load resistor and an AC power source.
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A full-wave rectifier is a device that converts alternating current (AC) to direct current (DC) and is more efficient than its half-wave counterpart. It typically includes a center-tapped transformer, two diodes, and a load resistor. The secondary winding of the transformer is divided to provide two equal voltages of opposite polarities, which is the pivotal element of full-wave rectification.
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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
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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.
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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:
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A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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使用平衡和S参数用于射频能量收割机的雷克特纳系统开发.

Muhamad Nurarif Bin Md Jamil1, Madiah Omar1, Rosdiazli Ibrahim2

  • 1Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Malaysia.

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概括

本研究介绍了一种新型的无线电频率能量收获器,使用分形天线为低能耗设备提供Wi-Fi信号. 它成功地点亮了一个LED,证明了物联网应用中电池的可持续替代品.

关键词:
收获RF能量的RF能量采集没有Wi-Fi的Wi-Fi.低射频功率的低射频功率是一个问题.这是Rectenna.

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科学领域:

  • 电气工程 电气工程
  • 收集能源 收集能源
  • 天线设计天线设计

背景情况:

  • 对射频识别 (RFID) 和物联网 (IoT) 的需求日益增长,需要为低功耗设备提供可持续的电源解决方案.
  • 减少对电池的依赖对于被动操作对于自主和持久的设备功能至关重要.

研究的目的:

  • 建议和评估用于收获无线电频率能量的rectenna架构,优化用于低功耗应用.
  • 为了研究使用2.4 GHz环境Wi-Fi信号的原型的性能.

主要方法:

  • 设计了一个整合分形天线的直角天线系统,一个带有Schottky二极管 (HSMS286C,MA4E2054B1-1146T) 的七级Cockroft-Walton整流器,以及一个低通波器.
  • 在罗杰斯5880 PCB基板上使用高级设计系统 (ADS) 进行模拟.
  • 制造并测试了集成整流器和碎形天线系统.

主要成果:

  • 模拟预测收获电压为3.53V,最低输入功率为-10dBm (0.1mW).
  • 制造出来的原型从环境Wi-Fi信号中实现了1.5V直流输出.
  • 成功为红色LED供电,证明了实际的能量收集能力.

结论:

  • 基于碎形天线的无线电频率 (RF) 收割机是为小型电子设备提供动力的可行解决方案.
  • 这项技术为物联网和RFID应用提供了一个可持续的,不依赖电池的电源.
  • 开发的rectenna架构显示出对自主,低功耗设备操作的承诺.