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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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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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Related Experiment Video

Updated: Jun 26, 2025

A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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Rectenna System Development Using Harmonic Balance and S-Parameters for an RF Energy Harvester.

Muhamad Nurarif Bin Md Jamil1, Madiah Omar1, Rosdiazli Ibrahim2

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

Sensors (Basel, Switzerland)
|May 11, 2024
PubMed
Summary
This summary is machine-generated.

This study presents a novel radio frequency energy harvester using a fractal antenna to power low-energy devices with Wi-Fi signals. It successfully illuminated an LED, demonstrating a sustainable alternative to batteries for IoT applications.

Keywords:
RF energy harvestingWi-Filow RF powerrectenna

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Area of Science:

  • Electrical Engineering
  • Energy Harvesting
  • Antenna Design

Background:

  • Growing demand for Radio Frequency Identification (RFID) and Internet of Things (IoT) necessitates sustainable power solutions for low-power devices.
  • Reducing reliance on batteries for passive operation is crucial for autonomous and long-lasting device functionality.

Purpose of the Study:

  • To propose and evaluate a rectenna architecture for radio frequency energy harvesting, optimized for low-power applications.
  • To investigate the performance of a prototype utilizing ambient Wi-Fi signals at 2.4 GHz.

Main Methods:

  • Designed a rectenna system integrating a fractal antenna, a seven-stage Cockroft-Walton rectifier with Schottky diodes (HSMS286C, MA4E2054B1-1146T), and a low-pass filter.
  • Conducted simulations using Advanced Design System (ADS) on a Rogers 5880 PCB substrate.
  • Fabricated and tested the integrated rectifier and fractal antenna system.

Main Results:

  • Simulations predicted a harvestable voltage of 3.53 V with a minimum input power of -10 dBm (0.1 mW).
  • The fabricated prototype achieved a 1.5 V DC output from ambient Wi-Fi signals.
  • Successfully powered a red LED, demonstrating practical energy harvesting capability.

Conclusions:

  • The fractal antenna-based radio frequency (RF) harvester is a viable solution for powering small electronic devices.
  • This technology offers a sustainable and battery-independent power source for IoT and RFID applications.
  • The developed rectenna architecture shows promise for autonomous, low-power device operation.