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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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...
Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

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 field inside...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

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...
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Fast Decoupled and DC Powerflow01:24

Fast Decoupled and DC Powerflow

The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...

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Related Experiment Video

Updated: May 28, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Characterization of a Metasurface Integrated 8-Plate Reconfigurable Coding Unit-Cell Coupler for Rotational

Jaewoo Jeong1, Sangwook Park2

  • 1Department of ICT Convergence, Soonchunhyang Unversity, Asan 31538, Republic of Korea.

Micromachines
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel metasurface coupler for wireless power transfer (WPT) in drones, overcoming charging disruptions caused by rotation. The reconfigurable unit-cell ensures continuous power delivery across all angles.

Keywords:
UAV wireless chrgingcapacitive wireless power transferdigital codingmetasurfacenull power pointrotational misalignment

Related Experiment Videos

Last Updated: May 28, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Area of Science:

  • Metamaterials and Metasurfaces
  • Wireless Power Transfer (WPT)
  • Unmanned Aerial Vehicles (UAVs)

Background:

  • Near-field capacitive WPT systems for UAVs face challenges with rotational misalignment, leading to null power points (NPP) and intermittent charging.
  • Existing solutions lack adaptability to maintain consistent power transfer during UAV operations.

Purpose of the Study:

  • To design and analyze a metasurface-integrated reconfigurable unit-cell coupler for stable WPT in UAVs.
  • To mitigate the impact of rotational misalignment and null power points in UAV charging systems.

Main Methods:

  • Emulation of 1-bit digital coding states (Symmetric Excitation and Cross-Excitation) within the unit-cell.
  • Meta-atom-level analysis at 6.78 MHz with a deep sub-wavelength profile (0.002λ).
  • Characterization using 3D full-wave electromagnetic analysis.

Main Results:

  • Achieved peak transmission coefficients of 0.945 (SE State) and 0.903 (CE State).
  • Demonstrated complementary extinction angles at 90° (SE) and 45° (CE).
  • Successfully bypassed null power points through dynamic switching between coding states.

Conclusions:

  • The proposed reconfigurable unit-cell ensures stable, continuous wireless power transfer across a full 360° rotation for UAVs.
  • Provides a foundational technology for developing scalable, intelligent metasurface-based wireless charging platforms for autonomous systems.