%0 Journal Article %T Higher-Order Leaky-Mode Bessel-Beam Launcher %+ Institut d'Électronique et des Technologies du numéRique (IETR) %+ Université Pierre et Marie Curie - Paris 6 (UPMC) %+ Dipartimento di Ingegneria dell'Informazione, Elettronica e Telecomunicazioni [Roma] (DIET) %A Fuscaldo, Walter %A Valerio, Guido %A Galli, Alessandro %A Sauleau, Ronan %A Grbic, Anthony %A Ettorre, Mauro %Z ANR-14-CE26-0030-01, WIREFREE %< avec comité de lecture %@ 0018-926X %J IEEE Transactions on Antennas and Propagation %I Institute of Electrical and Electronics Engineers %V 64 %N 3 %P 904--913 %8 2016-03 %D 2016 %R 10.1109/TAP.2015.2513076 %K Impedance %K high-order modes %K higher-order leaky-wave mode %K higher-order leaky modes %K electromagnetic launchers %K frequency 38 GHz to 39.5 GHz %K operating bandwidth %K electric field %K dispersion analysis %K Dispersion %K capacitive sheet %K Bessel beams %K Bessel-beam launcher %K Bandwidth %K artificial surface %K leaky waves %K millimeter waves %K Apertures %K millimetre wave propagation %K near-field focusing %K near-field measurements %K leaky radial waveguide %K Approximation methods %K zeroth-order Bessel function %K transverse-magnetic %K Prototypes %K propagating Bessel beam %K Index Terms-Bessel beams %K artificial sur- face %Z Computer Science [cs]/Networking and Internet Architecture [cs.NI] %Z Engineering Sciences [physics]/ElectronicsJournal articles %X We present a Bessel-beam launcher based on a leaky radial waveguide consisting of a capacitive sheet over a ground plane that supports higher-order leaky modes. A propagating Bessel beam is generated above the radiating waveguide. The Bessel beam is transverse-magnetic (TM) polarized with a vertical component of electric field that is a zeroth-order Bessel function of the first kind. A higher-order leaky-wave mode is used to reduce losses at millimeter waves and, at the same time, avoid the thin dielectric layers used in previously proposed lower order leakywave Bessel launchers. Closed-form design equations are provided for the proposed structure. In addition, the operating bandwidth of the launcher is defined using dispersion analysis. Near-field measurements of a prototype operating in the frequency range 38- 39.5 GHz validate the concept. The measured launcher generates a Bessel beam with a stable spot size of about 4.3 mm (0.57 λ) over a nondiffractive range of about 16.4 mm (2.2 λ), within about a 4% fractional bandwidth %G English %2 https://univ-rennes.hal.science/hal-01331289/document %2 https://univ-rennes.hal.science/hal-01331289/file/01331289.pdf %L hal-01331289 %U https://univ-rennes.hal.science/hal-01331289 %~ UNIV-NANTES %~ UPMC %~ UNIV-RENNES1 %~ CNRS %~ INSA-RENNES %~ IETR %~ SUP_IETR %~ IETR_SRC %~ STATS-UR1 %~ CENTRALESUPELEC %~ L2E %~ UR1-HAL %~ UR1-MATH-STIC %~ UR1-UFR-ISTIC %~ IETR-BEAMS %~ UPMC_POLE_1 %~ IETR-ADH %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ INSA-GROUPE %~ SORBONNE-UNIVERSITE %~ SU-SCIENCES %~ SU-TI %~ ANR %~ UR1-MATH-NUM %~ ALLIANCE-SU %~ IETR-SUMIT %~ NANTES-UNIVERSITE %~ UNIV-NANTES-AV2022