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Reference : UMR6164-MAUETT-008
Workplace : RENNES
Date of publication : Thursday, July 8, 2021
Type of Contract : FTC Scientist
Contract Period : 5 months
Expected date of employment : 2 August 2021
Proportion of work : Full time
Remuneration : Max monthly gross salary 2 437,62 € €
Desired level of education : PhD
Experience required : 1 to 4 years
Satellite communications (SATCOM) on the move are of interest both for civilian (onboard internet in trains and planes) and military applications (communication with surveillance drones and other military vehicles). To better exploit the capabilities offered by the new generation of satellites, several industrial and academic initiatives are developing novel mobile terminals at Ka-band in order to increase the data rate. Higher data rates will allow one to transmit larger volumes of data (e.g. high resolution multimedia), which calls for broadband antennas. The antenna overall thickness will be another critical feature, since it will determine the capability of integrating the terminals on mobile platforms. Low-profile antennas with performances comparable to bulky reflectors and lenses are needed, so they do not impact aerodynamics and the aesthetics of the vehicle. In addition, these planar antennas must provide beam scanning capabilities on the whole band of interest, dynamically scanning the beam over large angular sectors to follow the satellites in their orbit. Finally, architectures that can be easily conformed to curved chassis will be also pivotal.
To overcome these issues, we will study the combination of (1) a multi-beam quasi-optical beam-former for azimuthal scanning with (2) a reconfigurable radiating aperture for scanning in elevation. Quasi-optical beam-formers - are planar and compact solutions, which have been extensively used to scan the beam in azimuth. These beam-formers offer a major advantage with respect to phased arrays: they do not need phase shifters to scan the beam, which leads to a significant cost reduction and to lower energy consumption. However, most of the proposed systems do not provide a complete azimuthal scanning from 0° to 360°. Luneburg lenses constitute a promising alternative, but the beam generated by the source at 0° in the focal circumference will interfere with the sources placed between 90° and 270°. In conclusion, new broadband quasi-optical beam-formers are required to cover the 0° to 360° azimuthal range.
 M. Ettorre, R. Sauleau, and L. Le Coq, “Multi-beam multi-layer leakywave siw pillbox antenna for millimeter-wave applications,” IEEE Trans. Ant. Propag., vol. 59, no. 4, pp. 1093–1100, April 2011.
 F. Doucet et al., “Shaped continuous parallel plate delay lens with enhanced scanning performance,” IEEE Trans. Ant. Propag., vol. 67, no. 11, pp. 6695–6704, Nov 2019.
This project aims at developing a novel ultra-flat antenna architecture. This terminal will provide high data rates for satellite communications in mobile platforms (drones, terrestrial vehicles, airborne platforms). To that end, we will develop an ultra-compact beam-forming architecture consisting of a two-layered structure. The beam-former will be placed in the bottom layer, while the top layer will host a metasurface aperture responsible of radiation. The developed beam-former will be able to vary in azimuth the direction of propagation of a slow wave with planar wave-front over a 0 to 360° angular range. This way, a two-dimensional scanning will be achieved when combined with the effect of the modulated metasurface on top.
Education: PhD in electrical engineering.
Languages: fluent in English and French.
Background: modulated metasurface antennas and quasi-optical beam-formers.
The project will be carried out at the Institute for Electronics and Telecommunications of Rennes (IETR), www.ietr.fr, in Rennes, France. IETR is a CNRS research center (UMR CNRS 6164) with expertise in antenna design, micro-wave and RF architectures and systems, digital communications, remote sensing, and image and signal processing. IETR is organized into 6 departments comprising a total of 12 research teams. THRUWAYS will be implemented at IETR's Antenna and Microwaves Department (which is one of the largest in Europe at the academic level in his research field), and more precisely in the BEAMS team (BEAMS: BEam Antennas up to Mm and Sub-mm waves). BEAMS has three main research themes: electromagnetic modelling and optimization, antenna arrays (reflectarrays, transmitarrays, and phased arrays), millimeter and sub-millimeter wave antennas (lenses, SIW, active antennas, integrated antennas).
Constraints and risks
Nothing to declare
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