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Related Concept Videos

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.
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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.
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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Movable Antenna-Enabled RIS-Assisted Simultaneous Wireless Information and Power Transfer Systems.

Dun Feng1, Xuan Zhang1, Xiaofan Yu1

  • 1College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.

Sensors (Basel, Switzerland)
|December 11, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new system combining movable antennas (MA) and reconfigurable intelligent surfaces (RIS) for improved wireless information and power transfer. The novel framework significantly boosts performance compared to existing methods.

Keywords:
Internet of Things (IoT)Movable Antenna (MA)Reconfigurable Intelligent Surfaces (RIS)Simultaneous Wireless Information and Power Transfer (SWIPT)

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Electromagnetics

Background:

  • Simultaneous Wireless Information and Power Transfer (SWIPT) systems face challenges in efficiency and coverage.
  • Reconfigurable Intelligent Surfaces (RIS) offer a way to control wireless propagation environments.
  • Movable Antennas (MA) provide additional spatial degrees of freedom.

Purpose of the Study:

  • To investigate a novel framework integrating MA and RIS for enhanced SWIPT.
  • To maximize energy harvesting while ensuring communication reliability.
  • To jointly optimize base station beamforming, RIS phase shifts, and MA positions.

Main Methods:

  • Formulation of an energy harvesting maximization problem under communication reliability constraints.
  • Development of an efficient alternating optimization (AO) algorithm.
  • Application of successive convex approximation (SCA) and second-order Taylor expansion.

Main Results:

  • The proposed MA-enabled RIS-assisted SWIPT framework achieves notable performance gains.
  • Joint optimization of BS beamforming, RIS phase shifts, and MA positions is crucial.
  • Significant improvements are observed compared to conventional RIS and fixed-antenna systems.

Conclusions:

  • Integrating MA with RIS significantly enhances SWIPT systems.
  • The developed AO algorithm effectively solves the non-convex optimization problem.
  • This approach offers a promising direction for future wireless communication systems.