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Your search keyword '"Legay, Herve"' showing total 41 results
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41 results on '"Legay, Herve"'

3. GENERALIZED DESIGN METHODOLOGY OF HIGHLY EFFICIENT QUAD-FURCATED PROFILED HORNS WITH LARGER APERTURES

Author

Stoumpos, Charalampos, Fraysse, Jean-Philippe, Goussetis, George, Sauleau, Ronan, Legay, Herve, Institut d'Électronique et des Technologies du numéRique (IETR), 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)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Thales Alenia Space [Toulouse] (TAS), THALES [France], and Heriot-Watt University [Edinburgh] (HWU)

Subjects
[SPI]Engineering Sciences [physics], Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

International audience; In this work we demonstrate the extended and generalized methodology for the design of Quad-Furcated Profiled Horns (Q-FPHs). Based on a design case of a 4 lambda(0) x 4 lambda(0) Q-FPH, we extract the Generalized Scattering Matrix (GSM) of the enlarged quad-furcated discontinuity and provide analytical expressions for its multimode feeding. Next, the four feeding and the upper common waveguide sections are optimized accordingly through Mode-Matching (MM). The high aperture efficiency levels delivered by the methodology are verified by full-wave simulations of the optimized design case and compared to the state-of-the-art which is thereby redefined.

Published
2022

13. Structural and Radio Frequency Co-Design and Optimization of Large Deployable Reflectarrays for Space Missions

Author

Guarriello, Andrea, Loison, Renaud, Bresciani, Daniele, Legay, Herve, and Goussetis, George

Abstract

The structural and radio frequency (RF) design and optimization of a large deployable faceted reflectarray (RA) generating double polarization contour beam are presented in this work. The issue addressed is the thermoelastic stability of large RAs and the impact of the thermoelastic deformation (TED) under transverse thermal gradient on the RA performances. Finite element TED analysis is conducted on a deployable RA with self-standing structures, demonstrating the detrimental effects of the in-orbit TED impact on the RA performances, estimated to be above 3 dB losses. To this extent, a novel structural solution is proposed, based on the use of reliable mechanical support capable to mitigate the TED. The mechanical design reorientation is contingent on the RF design reformulation. The proposed novel mechanical and RF co-design concept and methodology allows the conception of a low-profile, thermo-structurally stable RA with compliant radiation patterns and high cross-polarization discrimination in the worst case thermal load. This methodology is based on a direct optimization of nine-panel faceted RA composed of advanced high-order Phoenix cells directly optimized to fulfill the contoured beam requirements and by respecting the local periodicity requirements of the layout.

Published
2023
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