Superbackscattering Antenna Arrays

Iñigo Liberal, Iñigo Ederra, Ramón Gonzalo, Richard W Ziolkowski

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper discusses the theory, design, and practical implementation of superbackscattering antenna arrays. In analogy with Uzkov's maximal directivity theorem, it is demonstrated that the maximal backscattering cross-section, normalized to the wavelength squared, of a linear array of N isotropic scatterers whose separation tends to zero is N<sup>2</sup>(N + 1)<sup>2</sup>/(4π). This analytical result is validated via numerical optimization of the excitation coefficients, and the same procedure is utilized to assess the maximal backscattering of arrays of electric Hertzian dipoles (EHDs). It is found that electrically small arrays of two and three EHDs can enhance the backscattering by factors of 6.22 and 22.01, respectively, with respect to the maximum value generated by a single element. In addition, physical realizations of arrays featuring comparable enhancement factors can be straightforwardly designed by using a simple procedure inspired by Yagi-Uda antenna concepts. The practical implementations of such arrays based on copper wires and printed circuit technologies is also addressed.

Original languageEnglish (US)
Article number7056432
Pages (from-to)2011-2021
Number of pages11
JournalIEEE Transactions on Antennas and Propagation
Volume63
Issue number5
DOIs
StatePublished - May 1 2015

Fingerprint

antenna arrays
Backscattering
Antenna arrays
backscattering
electric dipoles
Printed circuits
Yagi antennas
printed circuits
directivity
linear arrays
Wire
Antennas
Copper
Wavelength
theorems
wire
copper
optimization
augmentation
cross sections

Keywords

  • antenna theory
  • Backscattering
  • electrically small antennas
  • electromagnetic scattering
  • superdirectivity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Superbackscattering Antenna Arrays. / Liberal, Iñigo; Ederra, Iñigo; Gonzalo, Ramón; Ziolkowski, Richard W.

In: IEEE Transactions on Antennas and Propagation, Vol. 63, No. 5, 7056432, 01.05.2015, p. 2011-2021.

Research output: Contribution to journalArticle

Liberal, Iñigo ; Ederra, Iñigo ; Gonzalo, Ramón ; Ziolkowski, Richard W. / Superbackscattering Antenna Arrays. In: IEEE Transactions on Antennas and Propagation. 2015 ; Vol. 63, No. 5. pp. 2011-2021.
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