Basic theory of wireless power transfer via radio waves

Basic theory of wireless power transfer via radio waves

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Combining the magnetic and electric fields, an electromagnetic field can wirelessly transfer power to a receiver at longer distances. The fields create an electromagnetic wave when the wavelength of the field or the wave becomes shorter. We often use electromagnetic waves with frequencies in the MHz-GHz range. When a high-frequency electromagnetic wave is created, power can be wirelessly transferred to a distant receiver. The electromagnetic waves and fields were originally based on Ampere's law and Faraday's law; however, they can be better described by Maxwell's equations.

Chapter Contents:

  • 7.1 Introduction
  • 7.2 Propagation of radio waves
  • 7.2.1 Radio waves in a far field
  • 7.2.2 Radio waves in the radiative near field
  • 7.2.3 Radio waves in the reactive near field
  • 7.2.4 Radio waves from a dipole antenna
  • 7.3 Directivity control and beam formation using phased-array antenna
  • 7.4 Receiving antenna efficiency
  • References

Inspec keywords: computational electromagnetics; inductive power transmission; radiowaves; radiofrequency power transmission

Other keywords: electric fields; Maxwell equations; electromagnetic field; distant receiver; wireless power transfer; Faraday law; radio waves; Ampere law; high-frequency electromagnetic wave; magnetic fields

Subjects: Electric and magnetic fields

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