Modeling, Design and Demonstration for Discrete Lens Antennas with Circular-Polarization in the 60-GHz Band

International audience—This paper presents the modeling, design and demonstration of two circularly-polarized Transmit-Arrays (TA) operating in the 60-GHz band and generating a broadside beam and a 30°-tilted beam respectively. These arrays have a fairly simple structure with only three metal layers and are fabricated with a standard printed-circuit board technology. The simulated results show the performances of the unit-cells as well as the whole arrays, and detail their power budget. The experimental results in V-band are in very good agreement with the simulations and demonstrate very satisfactory characteristics. Power efficiencies up to 53.7% are reached with a 1-dB gain-bandwidth up to 9.1%, and low cross-polarization level

Design and demonstration of Linearly-Polarized Transmit-Arrays in X-band

International audienc

Design and Demonstration of Linearly-Polarized Transmit-Arrays in X-Band

International audienc

Wideband high-efficiency unit-cell for 1-bit and 2-bit transmit-arrays operating in X-band

International audienc

Tri-layer linearly-polarized discrete lens antenna operating in X-band, design & characterization

International audienc

Wideband 196-Element Transmit-Arrays Operating in mmWave Bands; Design & Demonstration

International audienc

Antenna-Filter-Antenna based Frequency Selective Surfaces for Quasi-Optical Applications in Q-Band

International audienceA new 3-layer antenna-filter-antenna (AFA) elementary cell is proposed for frequency selective surfaces (FSS) in quasi-optical applications, where wideband and low loss characteristics are crucial. The elementary cell is composed of a CPW resonator sandwiched between patch antennas. Finite element method is used for the design and verification of the proposed AFA elementary cell while a free space Gaussian optics measurement system is utilized for S-parameter characterization. The measurement results show a 27.6 % 3-dB (18.5 % 10-dB) bandwidth and a maximum in-band insertion loss of <0.2 dB for 40.5 GHz

Linearly Polarized Unit-Cells for Transmit-Arrays Operating in mmWave Bands

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Using Gaussian Optics Measurement System to Characterize A New Wideband Low-Loss Antenna-Slot-Antenna

International audienceA new type of unit cell featuring wideband low loss characteristics is proposed for transmit-arrays (TA) and frequency selective surfaces (FSS) in Quasi-Optical applications. The TA is realized as a non-uniform array of antenna-resonatorantenna (ARA) elements and the FSS is realized as a uniform array of ARA elements. Each ARA element is a three layer structure consisting of two patch antennas and a slot resonator. The ARA elementary cell is designed and verified using finite element method simulation. A free space Gaussian optics measurement system (GOMS) is utilized to characterize the elementary cell. The measurement results show a 20.7% -3dB (12.2% -10dB) bandwidth and a maximum in-band insertion loss of <0.2 dB for 42 GHz

Antennes quasi-optiques reconfigurables à grande ouverture aux fréquences millimétriques

Ce travail porte sur l étude, la conception et la réalisation d antennes de type réseau transmetteur. Le principe de ces antennes est basé sur un réseau de cellules élémentaires collectant le rayonnement d une source primaire et le transmettant à l espace libre avec une loi de phase et d amplitude déterminée. Un état de l art des réseaux réflecteurs et des réseaux transmetteurs est présenté afin de déterminer les performances et limitations actuelles de ces antennes. Une étude théorique est ensuite menée et a permis de développer un simulateur numérique. Celui-ci a été utilisé pour dimensionner, concevoir et simuler ce type d antennes. Une étude générique complète sur les performances possibles d un réseau transmetteur fournit des données sur l influence des principaux paramètres de la structure et sur les compromis à réaliser. Plusieurs prototypes ont été conçus, réalisés et caractérisés. Le premier prototype en bande X présente un gain de 14,3 dBi et une bande passante de 1 GHz autour de 9,8 GHz mais un rendement faible de 12 %. Deux autres prototypes dans la même bande de fréquence ont été réalisés, un en polarisation linéaire et l autre en polarisation circulaire, avec un gain de 23,4-24,3 dBi, une bande passante de 13-18% et un rendement de 50,4-48,4 %. Ces trois derniers prototypes permettent de dépointer le faisceau de plus de 30 par orientation de la source primaire. Enfin, plusieurs prototypes en bande V (60 GHz) ont été conçus et simulés. Ces derniers permettent d atteindre un niveau de gain de 26,7 dBi et un rendement de 58 %.This PhD thesis investigates the design and demonstration of transmit-array antennas. Those typically consist of a focal source illuminating a planar array of unit cells, each of them being composed of two radiating elements interconnected or coupled with phase-shifters and/or attenuators in order to generate a specific phase and amplitude distribution of the radiated field across the array. A state of the art on reflect-array and transmit-array antennas is presented in order to show current technologies and determine the performances and limitations of these antennas. A theoretical analysis of transmit-array antennas is presented and used to develop a numerical simulation tool. Next, this code has been used to investigate the general performances of transmit-arrays as a function of their main parameters. Several prototypes have been designed, fabricated and characterized. The first prototype at X-band achieves a gain of 14.3 dBi and a wide frequency bandwidth of about 1GHz but only 12 % of efficiency. Two others prototypes in the same band have been realized, one in linear polarization and the other in circular polarization, with 23.4-24.3 dBi gain, 13-18 % transmission bandwidth and 50.4-48.4 % efficiency. The beam-steering up to 30 has been demonstrated by shifting the focal source. Finally, several prototypes at V-band (60 GHz) have been designed and simulated. These prototypes can reach a gain of 26.7 dBi and an efficiency of 58 %.RENNES1-BU Sciences Philo (352382102) / SudocSudocFranceF