Thierry Dousset

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In this work the response of a phased-array antenna at a blind spot condition is enhanced by using a metamaterial based radome. By taking advantage of metamaterials one might be able to design ad-hoc impedance matching slab with uncommon constitutive parameters. To this end, classical transmission line models and novel retrieval techniques have been applied(More)
CNES and Thales Airborne Systems (TAS) have developed a new reflectarray antenna with electronic beam scanning for space applications. This paper describes phase shifter technology and antenna architecture. An engineering model in X-band frequency was designed and manufactured by TAS and was measured in the CNES Compact Antenna Test Range. The paper deals(More)
THALES Airborne Systems (TAS) has developed a new reflectarray design that has proven to be a potentially interesting device suited for space applications like Synthetic Aperture Radars and Telemetry subsystems. This document presents this new reflectarray technology (called ERASP). After a short presentation of the technology, we present radiofrequency(More)
A fully reconfigurable dual linearly-polarized phase-shifting unit-cell for reflectarrays is proposed in X-band. It consists of two orthogonal and symmetrical cross-type printed triangular dipoles loaded by 2 × 4 pin diodes. To keep independent phase responses both in vertical and horizontal polarizations and to minimize cross-polarization (by(More)
Active ReflectArrays have proven to be candidates with strong assets as low cost and high performance phased array antennas. THALES Systèmes Aéroportés has been developing for some years a concept based on a waveguide phase shifting unit cell, and applied for various applications. A new X-Band high gain electronically scanned(More)
A new configuration of 2-bit dual-linearly-polarised unit-cell is introduced in X-band. It consists of two orthogonal and symmetrical cross-type printed triangular dipoles loaded by p.i.n diodes. This cell exhibits good performance with insertion loss lower than 2 dB and an isolation level better than 26 dB between both orthogonal polarisations. The impact(More)
Active reflect-arrays have proven to be candidates with strong assets as low cost and high performance phased array antennas. THALES Systemes Aeroportes has been developing for some years a concept based on a wave-guide phase shifting cell and applied for various applications in X band. Recent and future applications necessitate improved performances, hence(More)
In this work, a metaradome based on a fakir's bed of nails is designed and tested in order to suppress the blind directions of a 100-element antenna array. The antenna is a microstrip array designed to operate in X-band. The fakir's bed metamaterial-like was first approximated using analytical formulas before a full-wave numerical optimization. Experimental(More)
In this work, different approaches for enhancing radiation properties of phased-array antennas based on metamaterials (MTM) are presented. In case of antenna front-end technology, efforts have been done in designing metaradomes for mitigation of the blind-spot effect inherent to the periodic structure of phased arrays and in designing a compact series(More)