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CIFRE - Functionalized radome for enhanced scanning capacity of planar steerable antennas

ABG-99872 Sujet de Thèse
06/09/2021 Cifre
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Thales & IETR
Palaiseau & Rennes - Ile-de-France - France
CIFRE - Functionalized radome for enhanced scanning capacity of planar steerable antennas
  • Physique
  • Electronique
Antenna, Additive Manufacturing, Electromagnetism, Metamaterial, Numerical methods

Description du sujet


Planar steerable antennas play an important role in many military and civil applications such as satellite communications, mobile terminals, radars, base stations for telecommunications, etc. These scanning antennas typically suffer from an increased scanning loss as the beam is steered off the broadside. In practice, the scanning range is therefore usually limited to ±60 degrees.

The degradation in antenna realized gain as the scan angle increases is mainly caused by two factors: a lower directivity resulting from a reduced effective radiating aperture and a strong active impedance mismatch on the radiating elements.

To improve the angular robustness of scanning arrays, two concepts have been explored in the literature. The first concept relates to wide-angle impedance matching (WAIM) techniques, which address the mismatch at the aperture–air interface and enhance impedance matching over a wide angle range. The second concept consists in using a quasi-optical system, which can deviate near-horizon incidence angles towards broadside, thus increasing the effective radiating aperture at high steered angles. Both concepts offer key advantages but, so far, no state-of-the-art solution offers a remarkable performance in scanning beyond 60° with a low form-factor.

Objectives of the PhD project

The overall objective of this PhD project will be to demonstrate an innovative concept to compensate the gain loss when antennas operate at high steered angles (>60°) so that link budgets, data rates, and spectral efficiency in SATCOM on the move applications are maintained.

The first task will consist in a thorough literature review on the various existing solutions.

The proposed research activity will benefit from a highly innovative development of theoretical and numerical modelling, design and optimization procedures for 3D-shaped structures with advanced functionalities. In particular, the development of dedicated numerical tools will be essential to achieve an efficient design and a low computation time. Additive manufacturing techniques will be considered to take advantage of all available degrees of freedom.

Finally, a demonstrator will be designed taking into account the fabrication process constraints, then manufactured and characterized with IETR/TRT facilities.

Nature du financement


Précisions sur le financement

Présentation établissement et labo d'accueil

Thales & IETR

This work will be supervised in the collaboration between IETR and Thales Research & Technology France (TRT-Fr). The candidate will work both at IETR (Rennes) and at TRT-Fr (Palaiseau).

IETR (Institut d’Electronique et des Technologies du numéRique, UMR CNRS 6164) is a public research laboratory gathering 344 persons (incl. 166 PhDs and post-doctoral fellows). The Antennas group of IETR is one of the largest in Europe at the academic level with over 90 persons (permanent researchers, PhD students, post-doctoral fellows) and measurement facilities from HF to THz bands. IETR has advanced antenna measurement infrastructures up to 330 GHz within the M²ARS platform.

Present in 56 countries and employing 68,000 people, Thales is the world leader in safety and security technologies for the Aerospace, Transportation, Defense and Security markets. To anticipate the evolution of the products developed in its operational divisions, Thales has a network of research centers, including the Thales Research & Technology France which welcome more than 500 researchers, PhD students and scientists from partner organizations to the Palaiseau site.

Profil du candidat

The candidate should hold a Master or equivalent degree in electrical engineering, physics. Strong knowledge in electromagnetism and electromagnetic (EM) simulation, good skills in using commercial EM software and MATLAB and/or Python programming are required for this position. French proficiency is not required but highly appreciated.

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