Etienne Girard
Alenia Aeronautica
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Publication
Featured researches published by Etienne Girard.
Progress in Electromagnetics Research-pier | 2010
Farooq Ahmad Tahir; Hervé Aubert; Etienne Girard
This article presents an equivalent electrical circuit for designing Radio-Frequency MEMS-controlled planar phase shifter. This kind of phase shifters has recently been incorporated in reconflgurable re∞ectarrays. The proposed equivalent circuit depends on the number, the ON/OFF state and the locations of the switches inside the unit cell. Such equivalent circuit is used for determining, with a little computational efiort, the two important design parameters i.e., the number and the locations of RF-MEMS switches in the phase shifter cell. These two design parameters then allow a designer to design a phase shifter cell having a linear distribution of a given number of phases over 360 - phase range at a single desired frequency.
IEEE Antennas and Wireless Propagation Letters | 2014
Tony Makdissy; Raphaël Gillard; Erwan Fourn; Etienne Girard; Hervé Legay
This letter presents a new phase-shifting cell topology for dual linearly polarized reflectarrays. It consists of two orthogonal sets of straight slots etched in a metallic plane and loaded with four capacitances in order to control the phase of the reflected wave. Measurements have demonstrated that the convenient capacitive loading of the central slots permits to provide 331 ° of phase range at 12.5 GHz with linear and parallel dispersions for the different phase states.
international symposium on antenna technology and applied electromagnetics | 2012
Hervé Legay; Daniele Bresciani; Eric Labiole; Renaud Chiniard; Etienne Girard; G. Caille; Daniel Calas; Raphaël Gillard; Giovanni Toso
Thales Alenia Space and its partners have developed a facetted reflectarray, made of five flat panels arranged along an offset parabolic profile. Faceting the demonstrator is essential for achieving satisfactory RF performances, and especially the largest bandwidth. A 1.3m piecewise reflectarray demonstrator has been designed, manufactured and tested, with a coverage over Canada, US, Puerto Rico and Hawaii. A very good agreement is obtained between the theoretical and measured radiation patterns. Many innovative techniques and processes were developed in order to meet the challenging specifications of a space telecommunication antenna. They are detailed in this article.
international symposium on antennas and propagation | 2016
Nelson J. G. Fonseca; Hervé Legay; Ségolène Tubau; Jean-Philippe Fraysse; Etienne Girard; Mauro Ettorre; Ronan Sauleau
A two-dimensional bifocal constrained lens design is introduced. This is found to be a good starting point for the design of continuous parallel plate waveguide beamformers. The proposed solution has the advantage to provide better scanning performance than the standard pillbox antenna, yet avoiding the complexity of alternative constrained lenses designs. Numerical results are provided to compare the proposed design with existing solutions.
ieee conference on antenna measurements applications | 2014
Hervé Legay; Etienne Girard; Guido Valerio; Mauro Ettorre; Ahmed Ali; Ronan Sauleau
A novel multiple beam antenna is proposed in Ka band. It consists of a dual reflector imaging configuration magnifying a reconfigurable phased array of smaller size, that produce a 2D coverage of multiple spot beams with a quasi-optical beamformer made of Pillbox 1D beamformers.
ieee international symposium on phased array systems and technology | 2016
Maciej Smierzchalski; Mauro Ettorre; Ronan Sauleau; Guido Valerio; Tony Makdissy; Etienne Girard; Hervé Legay
A quasi-optical system in Substrate Integrated Waveguide (SIW) technology is proposed to feed the primary array of an imaging system for satellite applications in Ka-band. An in-house Physical Optics (PO) tool is used for the complete antenna design reducing the phase aberrations of the imaging system and at the same time improving the Earth coverage by the Satellite. Measurement results validate the overall approach.
european conference on antennas and propagation | 2009
Hervé Legay; Daniele Bresciani; Etienne Girard; Renaud Chiniard; Eric Labiole; Olivier Vendier; G. Caille
international symposium on antenna technology and applied electromagnetics | 2006
Hervé Legay; G. Caille; Etienne Girard; Patrick Pons; Hervé Aubert; E. Perret; Pierre-François Calmon; Jean-Philippe Polizzi; J.-P. Ghesquiers; David Cadoret; Raphaël Gillard
european microwave conference | 2012
Tony Makdissy; Raphaël Gillard; Erwan Fourn; Etienne Girard; Hervé Legay
Electronics Letters | 2012
Tony Makdissy; Raphaël Gillard; Erwan Fourn; Etienne Girard; Hervé Legay