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Directive radiation from a diffuse Luneburg lens.

Oscar Quevedo-Teruel1, Yang Hao

  • 1School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK.

Optics Letters
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

Transformation electromagnetics enables directive antenna radiation from omnidirectional sources using a transformed Luneburg lens. This all-dielectric design offers frequency-independent operation for advanced antenna applications.

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Area of Science:

  • Electromagnetics
  • Antenna Theory
  • Metamaterials

Background:

  • Transformation electromagnetics provides novel methods for designing electromagnetic devices.
  • Designing directive antennas from omnidirectional sources is a significant challenge.
  • Luneburg lenses are known for their focusing properties.

Purpose of the Study:

  • To demonstrate directive antenna radiation from an omnidirectional source using transformation electromagnetics.
  • To propose simplified, all-dielectric diffuse surfaces based on optical transformations of Luneburg lenses.
  • To investigate both polynomial and sinusoidal transformation approaches.

Main Methods:

  • Analytical approach to transformation electromagnetics.
  • Optical transformation of a Luneburg lens to create a diffuse surface.
  • Simplification of material properties for all-dielectric fabrication.
  • Analysis of polynomial and sinusoidal transformation functions.

Main Results:

  • Achieved directive antenna radiation from an omnidirectional source.
  • Designed thin, diffuse surfaces using simplified all-dielectric materials.
  • Demonstrated that the proposed design has no upper operational frequency boundary.
  • Validated two transformation approaches (polynomial and sinusoidal).

Conclusions:

  • Transformation electromagnetics can effectively create directive antennas from omnidirectional sources.
  • The proposed all-dielectric diffuse surface designs are practical for fabrication.
  • The technique shows promise for developing frequency-independent directive antennas.