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Burokur S.N.,CNRS Fundamental Electronics Institute | Burokur S.N.,CNRS Mechanical Energy and Electromagnetism Lab | Daniel J.-P.,ADVANTEN | Ratajczak P.,Orange S.A. | De Lustrac A.,CNRS Fundamental Electronics Institute
Applied Physics Letters | Year: 2010

The directive emission from a bilayered metamaterial surface is numerically and experimentally reported. The LC-resonant metasurface is composed of both a capacitive and an inductive grid constituted by copper strips printed on both sides of a dielectric board. By the incorporation of varactor diodes in the capacitive grid, resonance frequency and phase characteristics of the metamaterial can be tuned. The tunable phase metasurface is used as a partially reflecting surface in a Fabry-Perot resonance cavity. Far field radiation patterns obtained by direct measurements show the reconfigurability of emission frequency while maintaining an enhanced directivity. © 2010 American Institute of Physics. Source


Komljenovic T.,University of Zagreb | Sipus Z.,University of Zagreb | Daniel J.-P.,ADVANTEN
EuCAP 2010 - The 4th European Conference on Antennas and Propagation | Year: 2010

This paper presents technique for designing hemispherical dielectric lens antennas for satellite communications enclosed in protective radome based on spectral domain analysis approach. The analysis technique is coupled with the global optimization technique (namely the particle swarm optimization algorithm), to allow optimization or synthesis of that kind of antennas. The developed tool is used to synthesize vehicular antenna structures and study the influence of radome on radiation pattern. Source


Burokur S.N.,University Paris - Sud | Germain D.,University Paris - Sud | Ratajczak P.,Orange S.A. | Daniel J.-P.,ADVANTEN | De Lustrac A.,University Paris - Sud
Microwave and Optical Technology Letters | Year: 2015

We present the design and characterization of a triband low-profile antenna based on the use of artificial magnetic conductor (AMC) surfaces. The engineered double AMC substrate allows reducing the separation between the radiating element and the ground plane. The radiating element is a wide band microstrip elliptical dipole and is associated to the double AMC substrate to cover the (790-860 MHz) GSM, the (1710-1880 MHz) DCS and the (1920-2170 MHz) UMTS telecommunication frequency bands. The whole antenna system presents a reduced level of backward radiation and is intended to be inserted in the back of a jacket. Presented experimental performances agree qualitatively with the numerical ones. The fabricated prototype demonstrates the feasibility of a triband antenna with a substantial reduction of the thickness through the use of AMC surfaces. © 2015 Wiley Periodicals, Inc. Source


Burokur S.N.,French National Center for Scientific Research | Daniel J.-P.,ADVANTEN | Ratajczak P.,Orange S.A. | De Lustrac A.,University Paris - Sud
Microwave and Optical Technology Letters | Year: 2011

The modeling and characterization of a broadband frequency agile metamaterial-based cavity antenna around 2 GHz is reported in this article.An electronically active metasurface composed of simultaneously a capacitive and an inductive grid is used as a partially reflecting surface (PRS), and the cavity is excited by an array of four wideband L-strip fed printed microstrip patch antennas. The incorporation of variable capacitance in the metasurface helps to tune the resonance frequency and the phase characteristics. Measurements performed on a fabricated prototype present a reconfigurable resonance frequency between 1.9 and 2.31 GHz and a directivity of 18 dBi for a low profile cavity thickness of λ/10 at 2 GHz. © 2011 Wiley Periodicals, Inc. Source


Burokur S.N.,CNRS Mechanical Energy and Electromagnetism Lab | Daniel J.-P.,ADVANTEN | Ratajczak P.,Orange S.A. | De Lustrac A.,University Paris - Sud
2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 | Year: 2011

This paper deals with the modeling and characterization of a broadband frequency agile metamaterial-based cavity antenna around 2 GHz. An electronically active metasurface is used as a Partially Reflecting Surface (PRS) and the cavity is excited by an array of four wideband L-strip fed printed microstrip patch antennas. A reconfigurable resonance frequency between 1.9 and 2.31 GHz is obtained and a directivity of 18 dBi is observed for a cavity thickness of λ/10 at 2 GHz. © 2011 IEEE. Source

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