Browsing by Subject "Negative refractive index"

Now showing items 1-10 of 10

    • Conference Object  

      Analysis of an off-broadside zero beam-squinting leaky-wave antenna using metamaterials 

      Kossifos, K. M.; Antoniades, Marcos A. (Institute of Electrical and Electronics Engineers Inc., 2016)
      It is shown that zero beam-squinting can be achieved in both series fed antenna arrays and leaky-wave antennas by employing two parallel-connected metamaterial transmission lines with equal positive group delays, but with ...
    • Conference Object  

      Arbitrary length zero-phase substrate integrated coaxial lines using NRI-TL metamaterials 

      Quddious, A.; Nikolaou, S.; Antoniades, Marcos A. (Institute of Electrical and Electronics Engineers Inc., 2017)
      Arbitrary-length zero-degree phase-shifting lines are presented at X-band that are based on negative-refractive-index transmission-line (NRI-TL) metamaterials implemented in substrate integrated coaxial line (SICL) technology. ...
    • Article  

      A broadband dual-mode monopole antenna using NRI-TL metamaterial loading 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2009)
      A printed monopole antenna is proposed which uses negative-refractive-index transmission-line (NRI-TL) metamaterial loading in order to achieve a broadband dual-mode operation. The metamaterial-loaded monopole supports a ...
    • Article  

      A broadband Wilkinson balun using microstrip metamaterial lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A metamaterial balun that converts a single-ended input to a differential output over a large bandwidth is presented. The device also exhibits excellent return loss, isolation, and through characteristics over the same ...
    • Article  

      A compact and low-profile metamaterial ring antenna with vertical polarization 

      Qureshi, F.; Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A compact (λ 0/11 footprint) and low-profile (λ 0/28 height) metamaterial ring antenna is proposed using two metamaterial unit cells. Each constituent unit cell consists of negative-refractive-index (NRI) microstrip ...
    • Article  

      Compact linear lead/lag metamaterial phase shifters for broadband applications 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2003)
      A compact one-dimensional phase shifter is proposed using alternating sections of negative refractive index (NRI) metamaterials and printed transmission lines (TL). The NRI metamaterial sections consist of lumped element ...
    • Article  

      A CPS leaky-wave antenna with reduced beam squinting using NRI-TL metamaterials 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2008)
      A reduced beam-squinting printed leaky-wave antenna (LWA) is proposed, comprising cascaded negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. Each NRI-TL unit cell is implemented in co-planar ...
    • Article  

      A folded-monopole model for electrically small NRI-TL metamaterial antennas 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2008)
      An improved model for analyzing electrically small NRI-TL antennas is proposed, that highlights the methods that enable these antennas to offer a good impedance match and a high radiation efficiency compared to previously ...
    • Conference Object  

      Fully-printed NRI-TL metamaterial phase-shifting lines implemented in CPS technology 

      Antoniou, P.; Antoniades, Marcos A. (Institute of Electrical and Electronics Engineers Inc., 2016)
      Compact phase-shifting lines are presented that are based on negative-refractive-index transmission-line (NRI-TL) metamaterials and which are implemented using co-planar strip (CPS) technology. The metamaterial lines are ...
    • Conference Object  

      A zero beam-squinting leaky-wave antenna using NRI-TL metamaterials 

      Kossifos, K. M.; Antoniades, Marcos A. (Institute of Electrical and Electronics Engineers Inc., 2015)
      A planar zero beam-squinting leaky-wave antenna is proposed at 5 GHz, consisting of a periodic arrangement of negative-refractive-index transmission-line (NRI-TL) metamaterial unit cells. The antenna is centre-fed through ...