%0 Conference Paper %F Oral %T Metal-only Reflecting Luneburg Lens Design for Sub-THz Applications %+ Institut d'Électronique et des Technologies du numéRique (IETR) %A Bilitos, C. %A Ruiz-Garcia, J. %A Sauleau, R. %A Martini, E. %A Maci, S. %A Gonzalez-Ovejero, D. %Z European Regional Development Fund %Z Ministry of Higher Education %< avec comité de lecture %3 2021 International Symposium on Antennas and Propagation (ISAP) %B 2021 International Symposium on Antennas and Propagation (ISAP) %C Taipei, France %I IEEE %P 1-2 %8 2021-10-19 %D 2021 %R 10.23919/ISAP47258.2021.9614591 %K Metasurface Reflecting Luneburg Lens beamforming flat optics sub-millimeter waves %K Metasurface %K Reflecting Luneburg Lens %K beamforming %K flat optics %K sub-millimeter waves %Z Engineering Sciences [physics]Conference papers %X This paper presents a metasurface (MTS) beamformer based on Reflecting Luneburg Lenses (RLLs) operating in the sub-THz range. RLLs consist of two circular parallel plate waveguides (PPWs) vertically stacked. The bottom wall of the lower PPW is loaded with a MTS with an axially symmetric modulation. The wave launched by a primary feed in the bottom PPW is collimated in the top one, so that a plane wave is identically generated for any azimuthal position of the source. The proposed solution uses a bed of nails, wellsuited to fabrication by Si micromachining, to implement the RLL refractive index profile. Simulation results yield a 30%-3dB directivity bandwidth around the center frequency (280 GHz). This device can be used as a beam-former for multi-beam antennas for Earth observation or for front-and back-hauling in beyond 5G wireless. %G English %2 https://univ-rennes.hal.science/hal-03873175/document %2 https://univ-rennes.hal.science/hal-03873175/file/ISAP2021.pdf %L hal-03873175 %U https://univ-rennes.hal.science/hal-03873175 %~ UNIV-NANTES %~ UNIV-RENNES1 %~ CNRS %~ INSA-RENNES %~ IETR %~ CENTRALESUPELEC %~ UR1-HAL %~ UR1-MATH-STIC %~ UR1-UFR-ISTIC %~ IETR-BEAMS %~ IETR-ADH %~ TEST-UR-CSS %~ UNIV-RENNES %~ INSA-GROUPE %~ UR1-MATH-NUM %~ IETR-SUMIT %~ NANTES-UNIVERSITE %~ UNIV-NANTES-AV2022