C. Mangenot

Chalmers University of Technology, Göteborg, Vaestra Goetaland, Sweden

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Publications (24)0 Total impact

  • 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 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: 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: 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
  • Cyril Mangenot, Giovanni Toso, Piero Angeletti
    Antennas for Ubiquitous Radio Services in a Wireless Information Society: Proceedings of the Symposium Concluding the Wide Band Sparse Element Array Antennas-WiSE Project, March 4, 2010, Wassenaar, the Netherlands. 01/2010;
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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.
    01/2010;
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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: 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
  • G. Toso, P. Angeletti, C. 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
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    ABSTRACT: In this paper the optimization of a transmitting array for satellite applications has been considered. Resorting to GA more than 30% of the initial elements can be switched off satisfying the technical requirements. The optimized configuration permits to drastically reduce the cost of the array and to improve the C/I level with respect to the initial fully populated array. Having all the active elements fed with the same amplitude, the HPA can be used in the most efficient way. Further improvements can be achieved by refining the cost function, and optimizing the element factor.
    Antennas and Propagation Society International Symposium, 2007 IEEE; 07/2007
  • 29th ESA Antenna Workshop. 01/2007;
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    P. Balling, C. Mangenot, A.G. Roederer
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    ABSTRACT: Current Ka-band multibeam satellite antenna systems often use one feed per beam, but involve a high number of reflector antennas (four for transmit and four for receive) to realise both acceptable crossover levels and spillover losses (Rao, 1999). Several developments go on to reduce the number of reflectors to one for transmit and one for receive at the cost of much complexity in the feed array and beamforming. Orthogonal efforts aim at developing antennas that both receive and transmit. Here we present a new concept (patent pending) where a shaped reflector reduces both the number of feeds per beam and the number of reflectors to one (with separate receive and transmit antennas). The price paid is an oversizing of the reflector making the reflector area comparable to the total area of the conventional four-reflector solution.
    Antennas and Propagation, 2006. EuCAP 2006. First European Conference on; 12/2006
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    ABSTRACT: The present paper focuses on TCS21 achieved results, which have not been published so far and that are fully consistent with CDR predictions. A synthesis of study main achievements is presented.
    01/2006; 626.