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16 results on '"Bresciani, Daniele"'

2. Angularly Stable Linear-to-Circular Polarizing Reflectors for Multiple Beam Antennas.

Author

Mercader-Pellicer, Salvador, Tang, Wenxing, Bresciani, Daniele, Legay, Herve, Fonseca, Nelson J. G., and Goussetis, George

Subjects
DIRECTIONAL antennas, PERMITTIVITY, REFLECTOR antennas, MANUFACTURING processes, FREQUENCY selective surfaces
Abstract

In this article, a new concept to improve the angular stability of linear-to-circular polarizing reflectors is presented. It is first explicitly demonstrated that existing design approaches heavily rely on the adjustment of the design stack-up, namely, the substrate height and relative permittivity, to the desired operating frequency. An approach is then proposed for decoupling the performance from the substrate parameters. The proposed approach provides increased design flexibility, resulting in performance improvement. Insight on the operating principle is provided resorting to equivalent circuit models. Subsequently, the benefits of the angularly stable reflection polarizer are demonstrated by a practical example involving a multiple beam antenna implemented using materials and processes compatible with satellite missions. The antenna exploits an innovative quasi-optical beamformer as primary feed combined with a cylindrical polarizing reflector. Numerical and experimental results from this antenna architecture are presented to confirm the improvements achieved with the proposed concept over existing designs. The close comparison of simulations with measurements that are achieved validates the concept and the design approach. [ABSTRACT FROM AUTHOR]

Published
2021
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3. Cross-Polarization Reduction of Linear-to-Circular Polarizing Reflective Surfaces.

Author

Mercader-Pellicer, Salvador, Goussetis, George, Medero, Gabriela M., Legay, Herve, Bresciani, Daniele, and Fonseca, Nelson J. G.

Abstract

This letter proposes an efficient design process to reduce the cross polarization of linear-to-circular reflection polarizers illuminated by practical feeds. In particular, we propose a two-step process, where first a geometrical optimization of the unit cell is applied along one plane of the reflector, followed by a progressive rotation of the unit cell in the orthogonal plane. An offset flat polarizer comprised of dipole unit cells fed by a standard gain horn has been used to illustrate the process. Significant improvements in cross-polarization discrimination are demonstrated by simulation. Two breadboards have been manufactured, and their response is compared in order to demonstrate the validity of the design process. Good agreement with measurements is observed corroborating the proposed technique. [ABSTRACT FROM AUTHOR]

Published
2019
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4. Spherical Mapping of the Second-Order Phoenix Cell for Unbounded Direct Reflectarray Copolar Optimization.

Author

Richard, Vincent, Loison, Renaud, Gillard, Raphael, Legay, Herve, Romier, Maxime, Martinaud, Jean-Paul, Bresciani, Daniele, and Delepaux, Fabien

Subjects
ARTIFICIAL neural networks, HUMAN behavior models, INTERSTELLAR communication, PROCESS optimization, CELLS
Abstract

A general synthesis approach is proposed for reflectarrays using second order Phoenix cells. It relies on an original spherical representation that transforms the optimization domain in a continuous and unbounded space with reduced dimension. This makes the synthesis problem simpler and automatically guarantees smooth variations in the optimized layout. The proposed mapping is combined with an Artificial Neural Network (ANN) based behavioral model of the cell and integrated in a min/max optimization process. Bi-cubic spline expansions are used to decrease the number of variables. As an application, a contoured beam for space communication in the [3.6-4.2] GHz band is considered. The gain improvement compared to an initial Phase Only synthesis (POS) is up to 1.62 dB at the upper frequency. Full-wave simulation of the final array is provided as a validation. [ABSTRACT FROM AUTHOR]

Published
2019
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5. A Multi Facet Composite Panel Reflectarray for a Space Contoured Beam Antenna in Ku Band

Author

Legay, Hervé, Bresciani, Daniele, Labiole, E., Chiniard, Renaud, Gillard, Raphaël, Thales Alenia Space (TAS), THALES, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Nantes Université (NU)-Université de Rennes 1 (UR1), Thales Alenia Space [Toulouse] (TAS), THALES [France], Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2013

6. Measurement of a 1.3 m Reflectarray in flat panels in Ku band

Author

Legay, Hervé, Bresciani, Daniele, Labiole, E., Chiniard, Renaud, Gillard, Raphaël, Toso, G., Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Thales Alenia Space (TAS), THALES, Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Thales Alenia Space [Toulouse] (TAS), and THALES [France]

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

7. A1.3 m facetted Reflectarray in Ku band

Author

Legay, Hervé, Bresciani, Daniele, Labiole, E., Chiniard, Renaud, Girard, Etienne, Caille, Gérard, Calas, D., Gillard, Raphaël, Toso, G., Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Thales Alenia Space [Toulouse] (TAS), THALES [France], Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Thales Alenia Space (TAS), THALES, and Université de Nantes (UN)-Université de Rennes 1 (UR1)

Subjects
ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2012

8. OPTIMIZATION STRATEGIES FOR DUAL POLARIZED REFLECTARRAYS

Author

Marnat, Loïc, Loison, Renaud, Gillard, Raphaël, Bresciani, Daniele, Legay, Hervé, Institut d'Electronique et de Télécommunications de Rennes (IETR), Centre National de la Recherche Scientifique (CNRS)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Thales Alenia Space (TAS), THALES, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Supérieure d'Electricité - SUPELEC (FRANCE)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Thales Alenia Space [Toulouse] (TAS), THALES [France], and Nantes Université (NU)-Université de Rennes 1 (UR1)

Subjects
[SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2008

10. A 1.3 m facetted reflectarray in Ku band.

Author

Legay, Herve, Bresciani, Daniele, Labiole, Eric, Chiniard, Renaud, Girard, Etienne, Caille, Gerard, Calas, Daniel, Gillard, Raphael, and Toso, Giovanni

Abstract

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. [ABSTRACT FROM PUBLISHER]

Published
2012
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11. Measurement of a 1.3 m reflectarray antenna in flat panels in Ku band.

Author

Legay, Herve, Bresciani, Daniele, Labiole, Eric, Chiniard, Renaud, Gillard, Raphael, and Toso, Giovanni

Abstract

Thales Alenia Space has developed a facetted reflectarray, made of five flat panels arranged along an offset parabolic profile, as shown in Figure 1. Faceting the demonstrator is essential for achieving satisfactory RF performances, and especially the largest bandwidth. Many innovative techniques and processes were developed and are reported in [1]. [ABSTRACT FROM PUBLISHER]

Published
2012

12. A MULTI FACETS COMPOSITE PANEL REFLECTAR-RAY ANTENNA FOR A SPACE CONTOURED BEAM ANTENNA IN KU BAND.

Author

Légay, Herve, Bresciani, Daniele, Labiole, Eric, Chiniard, Renaud, and Gillard, Raphaël

Subjects
REFLECTARRAY antennas, ANTENNAS (Electronics), ELECTRONIC equipment, DIRECTIONAL antennas, BANDWIDTHS
Abstract

A 1.3m piecewise reflectarray demonstrator has been designed, manufactured and tested, that radiates a contoured beam coverage over North America. 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. [ABSTRACT FROM AUTHOR]

Published
2013
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13. Comparison of Synthesis Strategies for a Dual-Polarized Reflectarray.

Author

Marnat, Loic, Loison, Renaud, Gillard, Raphaël, Bresciani, Daniele, and Legay, Hervé

Subjects
REFLECTARRAY antennas, COMPARATIVE studies, MATHEMATICAL optimization, PRINTED circuits, WAVELENGTHS, ANTENNA arrays
Abstract

This paper presents and compares four optimization strategies for printed reflectarrays. They are applied to synthesize a dualpolarized reflectarray using two kinds of slot-loaded patches. They provide objective criteria to deal with the numerous geometrical parameters available to tune the phase. The study relies on the comparativemeasurements of four different prototypes for the same 22λ0 × 22λ0 reflectarray (with λ0 the wavelength at f0 = 14.25 GHz). [ABSTRACT FROM AUTHOR]

Published
2012
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15. Control of the cross-polar reflection coefficients of reflectarray cells using truncated patches.

Author

Artiga, Xavier, Perruisseau-Carrier, Julien, Bresciani, Daniele, and Legay, Herve

Abstract

A technique for controlling the magnitude and phase of the co-to-cross reflection coefficients in microstrip reflectarrays cells is presented. It is based on truncating different patch corners, and thus can be efficiently applied to patches with sizes close to the array lattice. The main application of this technique is a novel synthesis method for reflectarrays with quasi-null cross-polarization, which requires the control of the four terms of the cells scattering matrix. However similar strategies could also be of use in other surface-based antennas and optical devices. [ABSTRACT FROM PUBLISHER]

Published
2013
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16. Advanced mechanical and radiofrequency design of reflect array antennas for space applications

Author

Guarriello, Andrea, Goussetis, George, and Bresciani, Daniele

Subjects
621.3841
Abstract

The analysis, optimization, and design of advanced reflectarray (RA) antennas for space applications are investigated in this work. The study is focused on developing methodologies and tools able to be integrated into the industrial framework of this thesis. RA antennas are a relatively emerging technology in the space telecommunication framework, benefiting from the advantages of the conventional reflectors and array antennas for high gain applications. This work surveys the coupled mechanical and radiofrequency (RF) design aspects of RA antennas. The mechanical design of large RA antennas shows some limitations concerning the survivability in the harsh space environment. Indeed, strong thermoelastic deformations of the RA composite structures can remarkably affect the antenna's electrical performances. This work surveys these aspects by proposing reliable and cost-effective structural solutions, which are consequently taken into account in the RA electrical design process. The electrical analysis and design process benefits from internal industrial tolls that are efficiently integrated with original tools developed in this thesis framework. The electrical design process lies in some hypotheses that allow an efficient design and op timization of the RA antenna layout, such as the local periodicity assumption. The local periodicity hypothesis is well respected in the RA design process investigated in this work by employing a particular unit cell, named Phoenix cell. The Phoenix cell geometries are efficiently handled in parametrized lookup tables to prevent any sharp geometrical transition on the RA layout. This work proposes and compares different design and optimization approaches in which the unit cells definition, and the subsequent lookup table construction, are efficiently integrated. The classical phase-only synthesis is surveyed and implemented. It represents the departing point for the direct layout optimization, aiming to improve the RA performances by naturally preventing any sharp geometrical transition on the RA layout. The optimization is conducted through a continuous and regular modulation of the RA cells geometries distribution by targeting prescribed performances, either on the aperture or the far-field. The coupled RF/mechanical design is applied to a concrete case of a large deployable RA for telecommunication spacecraft. Moreover, the electrical analysis and design of a small satellite RA antenna for payload data handling and transmission are investigated and implemented.

Published
2021

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