DocumentCode :
2364913
Title :
Numerical optimization of a satellite SHF nulling multiple beam antenna
Author :
Maiarelli, D. ; Guidi, R. ; Galgani, G. ; Lubrano, V. ; Bandinelli, M.
Author_Institution :
Alcatel Alenia Space Italia, Rome
fYear :
2006
fDate :
6-10 Nov. 2006
Firstpage :
1
Lastpage :
5
Abstract :
Satellite uplink antennas for SHF band communications may require high resolution adaptive nulling capability to provide sufficient pattern gain to desired users while maintaining pattern nulls on interference sources in close proximity to the users. Multiple beams antennas (MBA) consisting of an aperture illuminated by a collection of feeds located in its focal plane and a beam-forming network (BFN) for combining the outputs of the feed array are well-suited as nulling antennas for geosynchronous satellites. Demanding nulling performances in terms of interfering signals cancellation requires an accurate pattern prediction down to sidelobe level and a high cross-polar isolation of the radiated element beams. To meet these requirements, design methods and analysis tools have been employed that take into account the electromagnetic interaction among the feeders and the satellite structures. In the qualification phase of an SHF nulling MBA at AASI, the pattern measurements have shown an unpredicted cross-polar level due to the interaction of primary radiated field with the surrounding structures. This paper reports the main steps of the AASI and IDS activity in optimizing the antenna position and the shape of some antenna-farm structures in order to improve the cross-polar performance while considering mechanical constraints. The electromagnetic analyses have been carried out employing different numerical techniques to validate the results and reduce the risks of satellite structural modifications. The numerical techniques, the optimization procedure and measured results are reported and discussed.
Keywords :
array signal processing; focal planes; microwave antenna arrays; optimisation; satellite communication; SHF band communications; adaptive nulling; antenna farm; beamforming network; cross-polar performance; electromagnetic analysis; focal plane; geosynchronous satellites; high cross-polar isolation; multiple beam antenna; pattern measurements; satellite SHF nulling numerical optimization; satellite uplink antenna; unpredicted cross-polar level; Adaptive arrays; Antenna measurements; Apertures; Artificial satellites; Directional antennas; Electromagnetic analysis; Electromagnetic measurements; Feeds; Interference; Satellite antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antennas and Propagation, 2006. EuCAP 2006. First European Conference on
Conference_Location :
Nice
Print_ISBN :
978-92-9092-937-6
Type :
conf
DOI :
10.1109/EUCAP.2006.4585081
Filename :
4585081
Link To Document :
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