Keywords and research fields: microwave and system design and modelling, antenna array, beamforming, beamsteering, In-Band Full Duplex
Offer Type:PhD position (36 months scholarship) with an expected starting date in October 2022
Research Lab:Lab-STICC UMR CNRS 6285, BREST, FRANCE (https://labsticc.fr/en/teams/dh)
The candidate will be supervised by members of the Lab-STICC laboratory (UBO (University of Brest) and ENSTA Bretagne (Engineering school)) and integrated in the MatRF department and DH (Microwave Devices) team. The DH team members are involved in the design of innovative passive and active microwave devices, multi-standard, reconfigurable such as antennas, filters, phase shifters, baluns, power dividers, phase shifter lines, delay lines, amplifiers or non-Foster-based circuits based on functional materials or tunable components. This group has already obtained some nationally and internationally recognized results on Full-Duplex (e.g. -). The lab department (Ensta-Bretagne and UBO) is equipped with software (ADS, CST, HFSS) and hardware (VNA, anechoic chamber) technological platforms.
The Full-Duplex (FD or In-Band Full-Duplex (IBFD)) technique that consists of transmitting and receiving at the same time and in the same frequency band, is considered to be one of the most promising ways in order to double the data rate in terrestrial and space communications, or to optimize the spectral resources. In order to be effective, this technique requires reducing the level of Self-Interference (SI) signal between its emitter and receiver by more than 110 dB. To do so, at least two SI cancellation stages are demanded: at the antenna (or analogue) and digital levels. This work will mainly focus on achieving at least 50 dB of SI cancellation at the antenna level while introducing an independent beamsteering/beamforming capability in transmission and in reception. IBFD Independent Transmit and Receive Steerable Antenna arrays would bring a major innovation (not yet investigated, to our knowledge) toward a multi-functional system, such as: simultaneous monitoring-transmission or simultaneous jamming-scanning or any other couples of transmit-receive possibilities.
Objectives and work description
This project targets the design of an IBFD antenna system with independent TX and RX beam-steering/beamforming capabilities. After a state-of-the-art study on the most advanced techniques on Full-Duplex antenna systems and on small-size ESA (Electronically Steerable Antennas), the PhD will have to combine an efficient self-interference-cancellation technique (such as Near-Field Cancellation already implemented in the lab) together with the most suitable beam-steering antenna topology. First, IBFD steerable demonstrators (1D and 2D beam-steering) will be designed and characterized in ISM and C bands; then X and Ka band proof-of-concept system will be designed in order to try several scenarios for on-board systems (IBFD Communications, Radar and passive surveillance, targeted jamming).
Master or equivalent degree in electrical engineering, electronics, or physics with knowledge in RF and microwave design tools (HFSS, CST, ADS) with preferably a first experience (internship) in antenna design.
The candidate must necessarily hold a European nationality, Swiss or UK nationality.
Deadline to apply Send CV and Motivation/Recommendation letters before 20 April 2022 by email to André Pérennec (firstname.lastname@example.org +33 2 98 01 65 05) and Raafat Lababidi (email@example.com +33 2 98 34 89 50)
 H. Hijazi, M. Le Roy, R. Lababidi, D. Le Jeune, A. Pérennec, "Ultra-Wide-Band antenna system for in-band full- duplex applications", IET
Microwaves, Antennas & Propagation, 2021.
 H. Hijazi, M. Le Roy, R. Lababidi, D. Le Jeune, A. Pérennec "Wideband Dual-Polarized Full-Duplex Antenna Array", International
Conference ATC, (Invited Paper in FD special session), 2021.
 A. Pen, M. Le Roy, R. Lababidi, D. Le Jeune, A. Pérennec, JL. Issler, K. Elis, A. Gay, J-H. Corre,"Broadside FD Antenna Topologies for
Nanosat Intersatellite Link", IEEE NEWCAS, 2020.