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5G as a wireless power grid.

Aline Eid1, Jimmy G D Hester2,3, Manos M Tentzeris2

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA. aeid7@gatech.edu.

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|January 13, 2021
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Summary
This summary is machine-generated.

This study introduces a novel Rotman lens for 5G millimeter-wave systems, enabling efficient wireless power harvesting. The technology significantly enhances rectenna angular coverage and turn-on sensitivity, unlocking long-range device charging capabilities.

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Area of Science:

  • Electrical Engineering
  • Wireless Communications
  • Energy Harvesting

Background:

  • 5G technology utilizes millimeter-wave frequencies, enabling high power densities.
  • Existing wireless energy harvesting methods face limitations in angular coverage and sensitivity.
  • The potential for 5G to act as a wireless power grid is hindered by a fundamental trade-off in energy harvesting.

Purpose of the Study:

  • To propose a solution that overcomes the trade-off between rectenna angular coverage and turn-on sensitivity in wireless power harvesting.
  • To demonstrate a novel approach for efficient wireless energy harvesting using 5G millimeter-wave frequencies.
  • To enable long-range device charging by leveraging the power grid capabilities of 5G.

Main Methods:

  • Implementation of a Rotman lens between antennas and rectifiers.
  • Development of a printed, flexible millimeter-wave lens for robust and bending-resilient operation.
  • Integration of antenna sub-arrays, rectifiers, and DC combiners.

Main Results:

  • The Rotman lens achieved over 20 GHz of gain and angular bandwidth.
  • Demonstrated combination of large angular coverage and turn-on sensitivity in both planar and bent configurations.
  • Achieved wireless power harvesting up to 2.83 m, with potential exceeding 180 m using advanced rectifiers.

Conclusions:

  • The proposed Rotman lens design effectively breaks the conventional trade-off in wireless energy harvesting.
  • This technology enables efficient power harvesting over broad angular coverage and distances, utilizing 5G millimeter-wave frequencies.
  • The flexible and robust design holds significant promise for realizing a practical wireless power grid.