Cesson-Sévigné, France
Cesson-Sévigné, France

Time filter

Source Type

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.


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.


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.


Anguerat J.,Fractus SA | Daniel J.-P.,Advanten | Borja C.,Fractus SA | Mumbru J.,Fractus SA | And 4 more authors.
Progress in Electromagnetics Research | Year: 2010

The technology of metallized foam offers a new approach to design wire-like, flat, and 3D antennas. Only the necessary metal skin depth (some microns in UHF band) is deposited over arbitrary shaped structures. Thanks to this technology, new antenna designs have been possible offering low weight, possible shaping, and innovative architectures. To demonstrate these possibilities, a monopole inspired in the Sierpinski fractal carpet is built. The proposed design is suitable for a pico-cell base station antenna since the antenna operates at GSM850, GSM900, GSM1800, GSM1900, UMTS, Bluetooth/WLAN, WIMAX, and WIFI featuring an omni-directional radiation pattern and an average total e?ciency of 79%.


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.


Grant
Agency: Cordis | Branch: FP7 | Program: CP | Phase: ICT-2011.1.1 | Award Amount: 11.44M | Year: 2012

Recent history has shown that in the aftermath of an emergency, disaster or related unexpected events, telecommunication infrastructures play a key role in recovery operations. In most cases, the legacy terrestrial infrastructure is seriously compromised and cannot guarantee reliable services for citizens and rescue teams. It is also well accepted that current public safety networks cannot provide sufficient capacity for broadband applications.The main goal of ABSOLUTE is to design and validate a holistic and rapidly deployable mobile network to provide broadband services based on a flexible, scalable, resilient and secure network design.The most important elements that ABSOLUTE will pioneer are i) LTE-A base station embedded in Low Altitude Platform enabling a large coverage for broadband services ii) Portable land mobile base stations interoperable with conventional public safety networks, iii) Advanced multi-service professional terminals for first responders. The usage of satellite communications for both broadband backhauling as well as narrowband ubiquitous messaging services is another essential enabler.ABSOLUTE objectives will be achieved by developing innovative concepts out of promising ideas, namely cognitive mechanisms for dynamic spectrum management enabling a seamless network reconfiguration as well as opportunistic and cooperative networking mechanisms ensuring maximum system availability and dependability. Proof of concept implementations and realistic demonstrations are also envisaged.Thus ABSOLUTE will greatly impact the next generation public safety communication systems in Europe, enabling operators, manufacturers and other relevant stakeholders to exploit new market opportunities for LTE-A and satellite communications. The ABSOLUTE project aims also to greatly impact CEPT initiatives for frequency allocation in Europe and ETSI/3GPP standardization for public safety applications.


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.

Loading ADVANTEN collaborators
Loading ADVANTEN collaborators