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Browsing by Subject "Metamaterials"

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    • 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 ...

    • Article  

      Antenna applications of negative-refractive-index transmission-line structures 

      Eleftheriades, G. V.; Antoniades, Marcos A.; Qureshi, F. (2007)
      A number of new antenna-related applications that have recently been developed at the University of Toronto based on the concept of negative-refractive-index transmission-line metamaterials are reviewed. These include ...

    • Conference Object  

      Applications of negative-refractive-index transmission-line (NRI-TL) metamaterials in planar antennas and their feed networks 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2007)
      Negative-refractive-index transmission-line (NRI-TL) metamaterials and introduced and their fundamental properties are described. Following this, various applications using NRI-TLs are shown and their salient characteristics ...

    • 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  

      Bandwidth and Directivity Enhancement of Loop Antenna by Nonperiodic Distribution of Mu-Negative Metamaterial Unit Cells 

      Rezaeieh, S. A.; Antoniades, Marcos A.; Abbosh, A. M. (2016)
      The theory, design, analysis, and verification of a wideband and unidirectional loop antenna loaded with mu-negative (MNG) metamaterial unit cells is presented. It is shown that by nonperiodic positioning of MNG unit cells ...

    • Conference Object  

      Bandwidth and directivity enhancement of metamaterial-loaded loop antennas for microwave imaging applications 

      Antoniades, Marcos A.; Rezaeieh, S. A.; Abbosh, A. M. (Institute of Electrical and Electronics Engineers Inc., 2017)
      Compact, wideband and unidirectional loop antennas are presented, that are based on a conventional planar loop antenna that is loaded in a mu-negative (MNG) fashion with series capacitors, enabling a mu-zero (MZR) resonance ...

    • Conference Object  

      A broadband 1:4 Series power divider using metamaterial phase-shifting lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A metamaterial 1:4 series power divider that provides equal power split to all four output ports over a large bandwidth Is presented. The divider comprises four non-radiating metamaterial lines In series that can each Incur ...

    • Conference Object  

      A broadband balun using metamaterial phase-shifting lines 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2005)
      A 3-port device that converts a single-ended input to a differential output over a large bandwidth is presented. The balun comprises a Wilkinson divider, followed by a +90° negative-refractive-index (NRI) metamaterial (MM) ...

    • 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 ...

    • Conference Object  

      A compact and broadband NRI-TL metamaterial 

      Antoniades, Marcos A.; Eleftheriades, G. V. (2009)
      A compact and broadband negative-refractive-index transmission-line (NRI-TL) metamaterial antenna is proposed,which consists of a conventional printed monopole loaded in a left-handed fashion. The metamaterial loading ...

    • 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 ...

    • Conference Object  

      A compact crossover using NRI-TL metamaterial lines 

      Antoniades, Marcos A.; Henin, B.; Abbosh, A. M. (2012)
      A compact NRI-TL metamaterial branch-line crossover is presented that has an area of λ/36 × λ/12, and is a factor of 81 times smaller than its analogous transmission-line counterpart. Circuit simulations reveal that it ...

    • 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 Compact Multiband Printed Dipole Antenna Loaded with Two Unequal Parallel NRI-TL Metamaterial Unit Cells 

      Jamilan, S.; Antoniades, Marcos A.; Nourinia, J.; Azarmanesh, M. N. (2015)
      A negative-refractive-index transmission-line (NRI-TL) metamaterial-loaded dipole antenna is proposed, which has a fully printed configuration and exhibits multiband performance. The antenna consists of a conventional ...

    • Article  

      A compact tri-band monopole antenna with single-cell metamaterial loading 

      Zhu, J.; Antoniades, Marcos A.; Eleftheriades, G. V. (2010)
      A compact tri-band planar monopole antenna is proposed that employs reactive loading and a defected ground-plane structure. The reactive loading of the monopole is inspired by transmission-line based metamaterials (TL-MTM), ...

    • Article  

      Compact Wideband Loop Antenna Partially Loaded With Mu-Negative Metamaterial Unit Cells for Directivity Enhancement 

      Ahdi Rezaeieh, S.; Antoniades, Marcos A.; Abbosh, A. M. (2016)
      A wideband and unidirectional loop antenna partially loaded with mu-negative (MNG) metamaterial unit cells is presented. To reduce the electrical size of the antenna, its first resonance is formed by capacitively loading ...

    • Conference Object  

      Compact, wideband and multiband antennas based on metamaterial concepts 

      Antoniades, Marcos A.; Zhu, J.; Selvanayagam, M.; Eleftheriades, G. V. (2010)
      In this review article, various antenna designs that are based on metamaterial concepts are presented which have been developed at the University of Toronto. Specifically, several antennas that are based on the zero-index ...

    • Article  

      Computing and Communications for the Software-Defined Metamaterial Paradigm: A Context Analysis 

      Abadal, S.; Liaskos, Christos K.; Tsioliaridou, A.; Ioannidis, S.; Pitsillides, Andreas; Sole-Pareta, J.; Alarcon, E.; Cabellos-Aparicio, A. (2017)
      Metamaterials are artificial structures that have recently enabled the realization of novel electromagnetic components with engineered and even unnatural functionalities. Existing metamaterials are specifically designed ...

    • Article  

      Design and Development of Software Defined Metamaterials for Nanonetworks 

      Liaskos, Christos K.; Tsioliaridou, A.; Pitsillides, Andreas; Akyildiz, I. F.; Kantartzis, N. V.; Lalas, A. X.; Dimitropoulos, Xenofontas A.; Ioannidis, S.; Kafesaki, M.; Soukoulis, C. M. (2015)
      This paper introduces a class of programmable metamaterials, whose electromagnetic properties can be controlled via software. These software defined metamaterials (SDMs) stem from utilizing metamaterials in combination ...

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