Ground-plane-backed hemispherical Luneberg-lens reflector

Charles S. Liang, Donald A. Streater, Jian Ming Jin, Eric Dunn, Timothy Rozendal

Research output: Contribution to journalArticlepeer-review


A spherical Luneberg-lens reflector provides excellent passive wideband and wide-angular radar-signature augmentation, and has been widely used. Much of its signature-enhancement performance over half of its angular coverage can potentially be achieved by using a corresponding low-profile, hemispherical Luneberg-lens reflector, mounted on a reflective ground plane. This paper presents a quantitative study of a practical design of an off-the-shelf hemispherical Luneberg-lens reflector to gain insight and to fully explore its performance limits. Extensive wideband and wide-angle measurements were carried out for this lens configuration, and a comprehensive numerical analysis was also conducted, using the finite-element method combined with a boundary integral equation to complement the test data. The effect, in practice, of a finite-sized ground plane, and the resulting vertically polarized traveling-wave interference to the direct lens reflector's return, were demonstrated. Key design issues are discussed, and potential solutions are suggested.

Original languageEnglish (US)
Pages (from-to)37-49
Number of pages13
JournalIEEE Antennas and Propagation Magazine
Issue number1
StatePublished - Feb 2006


  • Electromagnetic scattering by nonhomogeneous media
  • Electromagnetic scattering measurements
  • Luneberg lens
  • Numerical analysis
  • Radar cross section

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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