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Maximum Power Transfer01:16

Maximum Power Transfer

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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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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Energy Stored In A Coaxial Cable01:31

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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Updated: Aug 8, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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High-Efficiency Wireless-Power-Transfer System Using Fully Rollable Tx/Rx Coils and Metasurface Screen.

Woosol Lee1, Yong-Kyu Yoon1

  • 1Electrical and Computer Engineering Department, University of Florida, Gainesville, FL 32611, USA.

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|February 28, 2023
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Summary

This study introduces a novel, flexible wireless power transfer (WPT) system utilizing rollable coils and metasurface (MS) screens. The MS screens significantly boost power transfer efficiency (PTE) and distance, even with misalignment.

Keywords:
beam focusingefficiency enhancementfully rollable WPT systemmetamaterialmetasurfacemisalignmentnegative refraction propertywireless power transfer (WPT)

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Electromagnetics

Background:

  • Wireless power transfer (WPT) systems face challenges in efficiency and range.
  • Existing WPT solutions often lack flexibility and reconfigurability.
  • Metasurfaces (MS) offer potential for electromagnetic field manipulation.

Purpose of the Study:

  • To develop a high-efficiency, reconfigurable WPT system.
  • To investigate the use of metasurface (MS) screens for enhancing WPT performance.
  • To demonstrate a flexible WPT system with rollable components.

Main Methods:

  • Integration of fully rollable transmitter (Tx) and receiver (Rx) coils.
  • Placement of metasurface (MS) screens between Tx and Rx coils.
  • Operation at a frequency of 6.78 MHz.
  • System performance evaluation at various power-transfer distances (PTD) and with multiple MS screens.

Main Results:

  • Significant enhancement in power-transfer efficiency (PTE) using MS screens across different PTDs.
  • PTE increased from 13.32% to 32.49% at 40 cm with one MS screen.
  • PTE increased from 5.42% to 42.25% at 50 cm with two MS screens.
  • Demonstrated improved PTE and PTD, and maintained efficiency under misalignment conditions.

Conclusions:

  • The proposed MS-based WPT system offers high efficiency and extended range.
  • The reconfigurable and rollable nature of the system allows for flexible spatial deployment.
  • Metasurface screens are effective in magnifying PTE and PTD, even in misaligned scenarios.