Offre de post doc à l’IETR de Rennes

SIW-based beam forming networks for Ka-band space applications
· Host laboratory
o Institut d’Électronique et de Télécommunications de Rennes (IETR), UMR CNRS 6164. Rennes,
France. www.ietr.fr
 Département ‘Antennes et Dispositifs Hyperfréquences’ – Equipe ‘Systèmes Rayonnants
Complexes’,
· Keywords
Phased arrays, Multi-beam antennas, Quasi-optical systems, Rotman lenses, Pillbox transitions.
· Context and overview of the problem
Multiple beam antennas are of great interest for satellite multimedia telecommunication systems. Next
generation satellite antennas should provide very directive beams, for reducing the terminal size and
increasing the capacity through frequency / polarization reuse scheme.
In the early 2000s, it was assumed that new Ka-band broadband missions could be defined by a regular grid
of 50 to 100 cellular cells in the range 0.5° to 0.7°. It was considered as a good balance between antenna
performance, payload power, spacecraft capabilities and telecom link budget in order to cope with the onground
user terminals.
To further decrease the cost of the satellite communications, the trend is to keep reducing the size of the
spots. A higher number of spots is thus required in order to cover a given area. The classical parabolic
systems are likely to suffer from losses and distorted shapes for the most defocused beams. New antenna
solutions are then required. The antennas should be able to generate many beams with reduced gain loss,
high control of side lobe level and compatible with a satellite accommodation. The solution envisaged in the
project is an imaging systems fed by a 2D SIW-based (substrate integrated waveguide) quasi-optical beam
former made by stacked pillbox transitions.
· Main goals
The main goal of the project is the analysis and design of 2D quasi-optical SIW beam forming networks for
next generation Ka-band space applications.
· Location and supervision
The fellowship will be developed at the IETR, Rennes in the framework of a French national project in
collaboration with Thales Alenia Space. The supervisors of the Post-Doc fellow will be Professor Ronan
SAULEAU, IETR, (Ronan.Sauleau@univ-rennes1.fr), and Mauro ETTORRE, IETR, CR2 CNRS
(mauro.ettorre@univ-rennes1.fr).
· Candidate profile
The candidate should hold a PhD in electrical engineering, physics or an equivalent title. In particular, he
should master electromagnetic theory, physics, mathematics, and circuit analysis. A good level of spoken
and written English is required.
· Application
Interested candidate should send a detailed CV, motivation letter and the contact details of three references
by email to Ronan SAULEAU (Ronan.Sauleau@univ-rennes1.fr) and Mauro ETTORRE (mauro.ettorre@univrennes1.
fr).
· Starting date: between 1st of April 2013 and end of Junr 2013. The earliest, the better.

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