Abdelwaheb Ourir

Publications (3)8.05 Total impact

• Article: Highly directive ISM band cavity antenna using a bi‐layered metasurface reflector

  Shah Nawaz Burokur, Abdelwaheb Ourir, Jean-Pierre Daniel, Philippe Ratajczak, André de Lustrac
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  ABSTRACT: The design of a highly directive metamaterial-based cavity antenna for a 2.46 GHz application is reported. The proposed structure is evolved from a Fabry-Perot (FP) cavity with a patch antenna acting as the feed and four metallic walls on the lateral sides. One of the two reflectors is the antenna's ground plane and the other is made from a bilayered metamaterial-based partially reflecting surface (PRS) constituted by a capacitive and an inductive grid. Calculations together with experimental results obtained from the fabricated prototype are presented. The results show a high directivity and low levels for the secondary lobes compared to a 2 × 2 patch antenna array. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1393–1396, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24391
  Microwave and Optical Technology Letters 03/2009; 51(6):1393 - 1396. · 0.62 Impact Factor
• Article: Discontinuous wavelength super-refraction in photonic crystal superprism.

  Anatole Lupu, André de Lustrac, Abdelwaheb Ourir, Xavier Checoury, Jean-Michel Lourtioz, Emmanuel Centeno, David Cassagne, Jean-Paul Albert, Frederic Pommereau, Lionel Legouezigou, Olivier Drisse, Odile Legouezigou, Estelle Deroin, Guang-Hua Duan
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  ABSTRACT: Experimental results on wavelength-dependent angular dispersion in InGaAsP triangular lattice planar photonic crystals are presented. An abrupt variation of the angular dispersion is observed for TM-polarized waves whose frequencies are comprised between those of the fourth and sixth allowed bands. According to the crystal period, the measured angle of refraction is found to either decrease or increase by 30 degrees within a wavelength range smaller than 30 nm. Experimental results are reproduced well from 2D finite difference time domain calculations. The observed phenomena are interpreted from the coupling of the incident light to different modes of the photonic crystal that travel with different group velocities and propagate in different directions within the crystal. Mode dispersion curves and mode patterns are calculated along with isofrequency curves to support this explanation. The observed discontinuous wavelength super-refraction opens a new approach to the application of superprisms.
  Optics Express 04/2006; 14(5):2003-13. · 3.59 Impact Factor
• Article: All-metamaterial-based subwavelength cavities (λ/60) for ultrathin directive antennas

  Abdelwaheb Ourir, André de Lustrac, Jean-Michel Lourtioz
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  ABSTRACT: In this letter, we present the characterization and modeling of a metamaterial-based resonant cavity for ultrathin directive printed antennas. A planar artificial magnetic conductor is used for the two reflectors of the Fabry–Pérot-type resonant cavity. One reflector behaves as a high impedance surface, and serves as a substrate for the printed antenna. The other reflector is a partially reflective surface used as a transmitting window. The cavity is operated on subwavelength modes, the smallest cavity thickness being of the order of λ/60. A drastic enhancement of the antenna directivity and gain is obtained over a relatively wide band from 7.5 to 10.1 GHz, corresponding to a range of cavity thicknesses from ∼ λ/3 to ∼ λ/60. The cavity resonance is seen to be correctly predicted from the standard ray theory approach.
  Applied Physics Letters 02/2006; 88(8):084103-084103-3. · 3.84 Impact Factor