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Niamien C.,Institute of Electronic and Telecommunications of Rennes | Collardey S.,Institute of Electronic and Telecommunications of Rennes | Sharaiha A.,Institute of Electronic and Telecommunications of Rennes | Mahdjoubi K.,Institute of Electronic and Telecommunications of Rennes
Electronics Letters | Year: 2011

A new way of designing an efficient and very small antenna is presented. The proposed antenna, with a size of λ 0/41, combines meander lines and a magneto-dielectric material having high refractive index and relatively low losses. The antenna gain measured (more than -5dBi) is sufficiently high for TV signal reception in the lowest UHF band around 470MHz. © 2011 The Institution of Engineering and Technology.


Boucher S.,Directorate General of Armaments | Sharaiha A.,Institute of Electronic and Telecommunications of Rennes | Potier P.,Directorate General of Armaments
ISAP 2013 - Proceedings of the 2013 International Symposium on Antennas and Propagation | Year: 2013

A broadband printed monopole antenna based on the variation of the conductivity along its length is proposed The result indicates that a non-monotonous repartition provides interesting performances in terms of impedance bandwidth but also concerning antenna gain. The achievement of the method is demonstrated through its application, using the carbon fibers to perform this conductivity variation. Monopole antenna presents a large impedance bandwidth of 123% with an interesting gain. Measurement and simulation present a good agreement. © 2013 Antenna Society of the Chinese Institute of Electronics.


Bor J.,Institute of Electronic and Telecommunications of Rennes | Lafond O.,Institute of Electronic and Telecommunications of Rennes | Himdi M.,Institute of Electronic and Telecommunications of Rennes
IEEE MTT-S International Microwave Symposium Digest | Year: 2014

Creating a gradient index into a dielectric structure is a major issue nowadays for the design of microwave components and antennas, especially for inhomogeneous lenses as Luneburg, Fresnel and Maxwell Fish-eye. The use of a foam material and a simple technological process can allow this. Because a foam material is composed of air bubbles, and core materials (resin, PVC,.), removing the air will increase the density of the foam and so increase its dielectric constant. The authors present a simple technological process to expel the air from a piece of foam in order to increase the permittivity of the foam. This is then applied to the design of a Luneburg lens antenna at 60 GHz. © 2014 IEEE.


Niamien M.A.C.,École Supérieure d'Ingénieurs en Génie Electrique | Collardey S.,Institute of Electronic and Telecommunications of Rennes | Sharaiha A.,Institute of Electronic and Telecommunications of Rennes | Mahdjoubi K.,Institute of Electronic and Telecommunications of Rennes
IET Microwaves, Antennas and Propagation | Year: 2014

Closed-form formulas for radiation efficiency and bandwidth predictions, suitable for printed inverted-F antennas (PIFAs) over lossy magneto-dielectric materials, are proposed. The formulation uses the field expressions inside the cavity for the first resonant-mode (fundamental mode) based on the cavity model. It includes the substrate effective permittivity (εre) and permeability (μre) in addition to the radiation from both the shorting-pad and the slot. The derived expressions for efficiency and bandwidth are validated with measurements and full-wave CST simulations based on the finite integration technique. Various sizes and types of magneto-dielectric materials are considered. It is noticed that magneto-dielectric materials havingv(εreμre) > εr or simply with μr > εr are advantageous for both radiation efficiency and bandwidth enhancement. © The Institution of Engineering and Technology 2014.

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