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Browsing by Subject "Microwave antennas"

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    • 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 ...

    • 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 ...

    • Article  

      Compact EBG-Backed Planar Monopole for BAN Wearable Applications 

      Abbasi, M. A. B.; Nikolaou, S. S.; Antoniades, Marcos A.; Nikolić Stevanović, M.; Vryonides, P. (2017)
      This paper presents a planar monopole backed with a 2 × 1 array of electromagnetic bandgap (EBG) structures. The reflection phase of a single EBG unit cell has been studied and exploited toward efficient radiation of a ...

    • 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  

      Conformai wearable monopole antenna backed by a compact EBG structure for body area networks 

      Antoniades, Marcos A.; Abbasi, M. A. B.; Nikolic, M.; Vryonides, P.; Nikolaou, S. (Institute of Electrical and Electronics Engineers Inc., 2017)
      A compact planar monopole antenna backed by an electromagnetic bandgap (EBG) structure is presented. The antenna is conformal to the human body and is intended for wearable applications in wireless body area networks. It ...

    • Article  

      Gain Enhancement of Wideband Metamaterial-Loaded Loop Antenna with Tightly Coupled Arc-Shaped Directors 

      Ahdi Rezaeieh, S.; Antoniades, Marcos A.; Abbosh, A. M. (2017)
      A wideband and unidirectional loop antenna with enhanced and stable gain is presented. To reduce the size of the antenna, the loop is loaded with three mu-negative (MNG) metamaterial unit-cells. The proposed unit-cells ...

    • Article  

      An investigation of printed Franklin antennas at X-band using artificial (metamaterial) phase-shifting lines 

      Wang, P. P.; Antoniades, Marcos A.; Eleftheriades, G. V. (2008)
      Non-radiating artificial phase-shifting lines are constructed using conventional positive-refractive-index (PRI) transmission lines (TL) and the recently developed negative-refractive-index (NRI) transmission lines. The ...

    • Article  

      Miniaturization of Planar Yagi Antennas Using Mu-Negative Metamaterial-Loaded Reflector 

      Ahdi Rezaeieh, S.; Antoniades, Marcos A.; Abbosh, A. M. (2017)
      A technique to reduce the size and enhance the operating bandwidth (BW) of planar Yagi antennas, while maintaining their unidirectional radiation characteristics, is proposed in this paper. In this technique, the reflector ...

    • Article  

      Miniaturized Planar Yagi Antenna Utilizing Capacitively Coupled Folded Reflector 

      Rezaeieh, S. A.; Antoniades, Marcos A.; Abbosh, A. M. (2017)
      The analysis and design of a unidirectional and wideband printed Yagi antenna with miniaturized size using a capacitively coupled reflector is presented. Reflectors have been widely used for canceling back radiation of ...

    • Article  

      Planar antennas for compact multiband transceivers using a microstrip feedline and multiple open-ended ground slots 

      Antoniades, Marcos A.; Dadgarpour, A.; Razali, A. R.; Abbosh, A. M.; Denidni, T. A. (2015)
      Two planar antennas for compact multiband transceivers are presented, that employ an open-ended microstrip feedline that couples to multiple open-ended ground slots. The effect of separately introducing each of the slots ...

    • 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 ...

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