Browsing by Subject "Metamaterials"
Now showing items 21-34 of 34
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Doctoral Thesis Open Access
Design and implementation of quad-band microwave devices using the negative refractive index transmission-line technique
(Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2015-05)Ο όρος Μεταϋλικά, χρησιμοποιείται για την περιγραφή τεχνητών, σύνθετων, περιοδικών δομών με μέγεθος μικρότερο του μήκους κύματος, οι οποίες έχουν ασυνήθιστες ηλεκτρομαγνητικές ιδιότητες, δηλαδή ταυτόχρονα αρνητική (διηλεκτρική ...
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Article
A Directivity-Band-Dependent Triple-Band and Wideband Dual-Polarized Monopole Antenna Loaded with a Via-Free CRLH Unit Cell
(2015)A printed triple-band and wideband dual-polarized meander-line monopole antenna with a single CRLH metamaterial loading is presented. The metamaterial loading improves the impedance matching and causes the proposed antenna ...
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Conference Object
Enabling electromagnetic applications of negative-refractive-index transmission-line metamaterials part II
(Institute of Electrical and Electronics Engineers Inc., 2004)The 1-Dimensional (1-D) metamaterial phase-shifting lines presented in [1] can be used to develop compact and broadband, non-radiating, metamaterial feed-networks for antenna arrays. These can be used to replace conventional ...
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Article
A folded-monopole model for electrically small NRI-TL metamaterial antennas
(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 ...
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Article
Gain Enhancement of Wideband Metamaterial-Loaded Loop Antenna with Tightly Coupled Arc-Shaped Directors
(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 ...
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Article
An investigation of printed Franklin antennas at X-band using artificial (metamaterial) phase-shifting lines
(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 ...
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Article
Miniaturization of Planar Yagi Antennas Using Mu-Negative Metamaterial-Loaded Reflector
(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 ...
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Conference Object
A multi-band NRI-TL metamaterial-loaded bow-tie antenna
(2011)A compact, fully-printed and low-profile bow-tie antenna is proposed, which exhibits multi-band performance by loading a reference bow-tie antenna with series capacitive gaps and shunt inductive strips, to form an asymmetric ...
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Article
Multiband compact printed dipole antennas using NRI-TL metamaterial loading
(2012)A compact, fully-printed negative-refractive-index transmission-line (NRI-TL) metamaterial-loaded dipole antenna is proposed, which exhibits multiband resonant characteristics that are not harmonically related. The multiband ...
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Conference Object
Negative-refractive-index transmission-line metamaterial-loaded dipole antennas
(2012)Several compact, fully-printed negative-refractive-index transmission-line (NRI-TL) metamaterial-loaded dipole antennas are proposed. The antennas achieve multi-band behaviour by loading a host dipole antenna with series ...
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Conference Object
A NRI-TL metamaterial-loaded bow-tie antenna
(2011)A fully-printed and low-profile bow-tie antenna is proposed, which exhibits multi-band performance by loading a bow-tie antenna with series capacitive gaps and shunt inductive strips, to form an asymmetric two unit-cell ...
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Conference Object
Selected antenna applications of Negative-Refractive-Index Transmission-Line (NRI-TL) metamaterials
(2006)Metamaterials (MM) that exhibit a simultaneously negative electric permittivity E and magnetic permeability μ, and thus a negative refractive index (NRI), have recently attracted considerable attention in the electromagnetics ...
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Book Chapter
Transmission-line based metamaterials in antenna engineering
(Springer Singapore, 2016)In this chapter, transmission-line-based metamaterials are presented, and their application to the design of passive and active antennas is outlined. Transmission-line metamaterials, also termed negative-refractive-index ...
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Conference Object
A zero beam-squinting leaky-wave antenna using NRI-TL metamaterials
(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 ...