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Publications (28)0 Total impact

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    ABSTRACT: Mesh reflector antennas made of multiple quasi-flat facets arranged with a regular lattice are known to generate high level sidelobes, called faceting lobes. This paper investigates some deterministic ways to reduce the faceting sidelobes of mesh reflector antenna by applying phyllotactic arrangements to the faceting of the reflector surface. This nature-inspired arrangement is derived from a spiral pattern with Fibonacci sequence, and is known to be irregular.
    2nd international conference on Advanced Lightweight Structures and Reflector Antennas, Tbilisi , Georgia; 10/2014
  • P. Angeletti, C. Mangenot, G. Toso
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    ABSTRACT: The paper provides a short overview on recent ESA developments on array antenna architectures for satellite antennas generating a multiple spot beams coverage with a single aperture. In particular, solutions based on direct radiating arrays, discrete lens arrays, and arrays magnified by confocal reflectors will be discussed. ESA is supporting since several years activities in this challenging domain.
    2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting; 07/2013
  • G. Toso, C. Mangenot, P. Angeletti
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    ABSTRACT: The objective of this work is to provide an overview on recent ESA developments on multibeam satellite antennas generating a multiple spot beams coverage with a single aperture. In particular, solutions based on a single oversized reflector, direct radiating arrays, active discrete lenses, and confocal reflectors will be discussed. They represent interesting solutions with respect to the architecture based on three or four reflectors which is still considered today the reference solution. ESA is supporting since several years activities in this challenging domain.
    Antennas and Propagation (EuCAP), 2013 7th European Conference on; 01/2013
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    ABSTRACT: The design of dual-optics circular-polarization offset reflectors has been addressed by using circular polarization selective surfaces (CPSS). A novel design of CPSS based on Pierrot's cells is proposed, and design guidelines and limitations of this technology are given. Manufacture constraints are discussed and a more reliable fabrication process is developed. A 29×29 array has been constructed and measurements are ongoing.
    Antennas and Propagation (EUCAP), 2012 6th European Conference on; 01/2012
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    ABSTRACT: The recent frequency allocations for space-borne radars in P band (432-438 MHz) have aroused the interest of the scientific community. Possible applications for radars operating in this frequency band range from ice sounding to biomass monitoring. Due to the low operational frequencies and accordingly long wavelengths, the required surface for a P-band radar antenna is in the order of 60 or more square meters. Such dimensions demand lightweight and robust mechanical structures, capable of a compact stowed volume in order to be compatible with small and low cost launchers. In the frame of the ESA contracts on Very Large Space Antenna Apertures and on Passive Subarray Technological Development, Thales Alenia Space studied and proposed an innovative architecture satisfying both the high performance requirements and the mechanical constraints. Several prototypes have also been manufactured and a test campaign validated the RF design.
    Antenna Technology and Applied Electromagnetics (ANTEM), 2012 15th International Symposium on; 01/2012
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    ABSTRACT: This paper presents a new compact orthomode transducer (OMT) able to extract or combine two orthogonal linear polarizations in a very compact manner with simple manufacturing process. The component looks similar to the well- known septum polarizer but contrary to this one, the new component is able to handle dual linear polarization. I. INTRODUCTION There is a general trend for mass and size reduction of the feed components in all space missions. In multi-beam ones, these features are the driver for the feed designer since the antenna is usually implemented by an active/passive array of feeds in the focal plane of a reflector system. The feeds of the cluster are close together side-by-side. Therefore, it is extremely important to reduce the size of the feeds in X and Y axis (being Z the feed cluster propagation axis). If the radiating element of the feed is small (which is normally the case in focal arrays) the limiting factor that prevents the size reduction is the orthomode transducer (OMT) and the waveguides attached to it. Moreover, due to the large number of feeds required for those applications, the OMT has to be easy to manufacture and integrate.
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    ABSTRACT: This paper will give an overview of the recent advances on an innovative sparse array synthesis technique for the design of satellite antenna arrays. The equi-power sub-arrays constituting the aperiodic array are placed on a lattice reproducing the positions of the sunflower seeds, opportunely adjusted according to a desired tapering law. This particular non-uniform lattice is selected, essentially, because it guarantees a favourable radial and azimuthal spreading of the element positions. In this way the pattern in the sidelobes and grating lobes region tends towards a plateau-like shape, avoiding the presence of high, narrow peaks. Moreover, by manipulating the element positions with the presented technique, the beamwidth can be adjusted and the sidelobe level SLL kept under an assigned value without any amplitude tapering of subarray excitations; the latter is replaced by 'space tapering', as the inter-element spacing increases from the centre to the array periphery, while all the elements are fed with the same power. This planar array can be considered in the design of a transmit direct radiating array for a communication antenna deployed on a geostationary satellite.
    Antennas and Propagation Society International Symposium (APSURSI), 2010 IEEE; 08/2010
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    ABSTRACT: Three candidate Earth Explorer Core Missions have been selected for Phase A after a User Consultation Meeting which took place in January 2009: BIOMASS, CoReH2O and PREMIER. A further down-selection shall take place in 2011/12, with a projected launch in the 2016/17 timeframe. Among the three candidates, two SAR missions are in the race: BIOMASS will carry a P-band polarimetric SAR for global observation of above-ground biomass and associated geophysical parameters as a primary objective; CoReH2O will provide dual-frequency (X/Ku-band) SAR observations of snow cover, glaciers and sea-ice for retrieving the snow cover extent, snow-water equivalent as well as other important cryospheric parameters. In complement to the Phase A studies, technology risk-retirement activities started, and their latest status and results are reported in this paper.
    Synthetic Aperture Radar (EUSAR), 2010 8th European Conference on; 07/2010
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    ABSTRACT: An innovative aperiodic planar array for satellite communications has been recently proposed [1–2]. The configuration presented guarantees an almost rotationally symmetric pencil beam pattern and a very low sidelobe level. In order to improve the directivity, while keeping limited the number of controls, the available aperture is filled with different sized sub-arrays. In this work the ideal radiators, previously considered in the simulations, have been replaced by square tiles working in circular polarization. These tiles, composed by several patches, have been constructed, measured and used in the assemblying of the final array antenna.
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    ABSTRACT: In the frame of the BIOMASS mission promoted by ESA for evaluating and monitoring Earth biomass, the expected performance of a P-band SAR instrument based on very large Direct Radiating Array antenna is addressed, as well as its architecture and the accommodation challenge on a platform.
    IEEE International Geoscience & Remote Sensing Symposium, IGARSS 2010, July 25-30, 2010, Honolulu, Hawaii, USA, Proceedings; 01/2010
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    ABSTRACT: This paper presents results of the mechanical investigations in reconfiguration possibilities of different concepts of the reflecting surfaces. The following three concepts are considered and studied: triaxially woven carbon fibre reinforced silicone (TWF CFRS), biaxially woven fabric CFRS (BWF CFRS) and combined orthogonally woven wire meshes with fine and coarse weaves of two different diameter wires. For assessing the ability of such materials to be used as reflecting surface for reconfigurable reflector, three missions and respective coverage areas have been identified. These are: European, Brazil and Conus. These three missions are considered as being representative of a typical scenario of reconfiguration. A RF optimization has been performed to define the surface shapes in all these cases. FEM structural analyses and optimization results, results of mechanical tests as well as RF aspects and comparison to the target optimized shapes defined by the RF optimization are addressed in the paper.
  • Cyril Mangenot, Giovanni Toso, Piero Angeletti
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    ABSTRACT: We have proposed and validated through simulations the possibility to interleave two pyramidal multi-band antennas. This new design enables to overcome bandwidth limitation problems as only one trap is now needed per radiating element on the radio navigation antenna. The feeding network is simplified as the two applications are now separated and polarizations can be defined independently for the two applications without significant impact on antenna design.
    Antennas and Propagation Society International Symposium, 2009. APSURSI '09. IEEE; 07/2009
  • Giovanni Toso, Piero Angeletti, Cyril Mangenot
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    ABSTRACT: Antenna architectures based on active aperiodic arrays are considered a promising solution for multibeam transmit antenna embarked on board Earth orbiting satellites. Active aperiodic arrays with equiamplitude excitation represent an alternative to active periodic arrays with tapered amplitude excitation. The paper will offer a preliminary trade-off between the two configurations from a system level perspective.
    Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on; 04/2009
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    ABSTRACT: In order to keep the cost and the complexity of large direct radiating arrays limited, it is crucial to reduce the number of control points and to simplify the beamforming network. Aperiodic arrays with elements using only amplifiers working at the same, optimised, point represent an interesting solution especially when the array has to generate a pencil beam with a limited scanning range. In this paper a deterministic procedure for designing a non-periodic planar array radiating a rotationally symmetric pencil beam pattern with an adjustable sidelobe level is proposed. The procedure relies on modifying the typical locations of the sunflower seeds that are deployed on a particular Fermat spiral.
    Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on; 04/2009
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    ABSTRACT: This paper provides an analytical expression of a new boundary function for multipaction analysis in multicarrier operation. This boundary function is applicable for the general case where the signal amplitude of each carrier and the frequency spacing between each adjacent carrier of the multicarrier signal are different.
    Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on; 01/2009
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    ABSTRACT: An effective procedure for designing non-periodic, planar array antennas is discussed. It amounts to replicating by orthogonal projection two radiation mask tailored, non-periodic, linear arrays. Meeting the design specifications by these linear arrays guarantees their fulfillment in the entire field of view. The advocated methodology is illustrated by tackling a demanding design problem referring to a satellite communication application, requiring a narrow beam and low side-lobes levels.
    Radar Conference, 2008. EuRAD 2008. European; 12/2008
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    ABSTRACT: This work identifies the non-periodic array configurations for a space multibeam communication satellite which minimise the number of active chains while ensuring a proper control of both the sidelobe (SLL) and grating lobe (GL).
    Antennas and Propagation Society International Symposium, 2008. AP-S 2008. IEEE; 08/2008
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    ABSTRACT: This paper presents an overview of ESA¿s on-going technology and mission concept developments for future SAR missions beyond Sentinel-1. On the mission concept development side, six candidate Earth Explorer Core Mission ideas are studied at phase 0 level. Two of the candidates ¿ BIOMASS and CoRe-H2O ¿ are SAR mission ideas using observations at respectively P- and dual frequency X/Ku-bands, addressing fundamental Earth system science issues. The sounding of terrestrial and planetary ice-sheets is an area where some concerted effort is focussed for enabling future Earth observation and planetary missions. An airborne P-band ice sounding demonstrator has been developed for assessing the feasibility of various clutter cancellation techniques. On the technology development front, specific risk-retirement actions are described in the areas of antennas and highpower amplifiers.
    Synthetic Aperture Radar (EUSAR), 2008 7th European Conference on; 07/2008
  • G. Toso, C. Mangenot, A.G. Roederer
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    ABSTRACT: In this paper some of the potentialities of aperiodic arrays for multiple beam satellite applications are discussed. Especially when their elements are uniformly fed, aperiodic arrays may be useful for reducing cost and complexity of direct radiating arrays for satellite multibeam applications. Playing with the aperiodicity, the number of elements can be reduced without changing the array aperture size while sidelobe and grating lobe levels can be optimised to deal with isolation constraints. Equal amplitude excitation of the elements in the transmit mode maximizes the antenna power efficiency since all the amplifiers operate at their most efficient working point. Moreover, the higher power required per amplifier, to keep a similar equivalent isotropically radiated power, favours the use of high-efficiency mini travelling tube amplifiers instead of solid state amplifiers. Grating lobes peak is reduced as well when the elements are positioned in one aperiodic lattice.
    Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on; 12/2007