Characterization of focusing properties of a homogeneous lens and design of its primary source with FEKO software
Averty Florent, Louzir Ali, Pintos Jean-François, Chambelin Philippe Jehamy Eddy*, Landrac Gabrielle*, Coupez Jean-Philippe*, Person Christian*
Thomson multimedia, corporate Research; *LEST-ENST de Bretagne, France
Among the access networks of the future, the low orbit satellite communication systems, such as SkyBridge or Teledesic, allow transmissions with very high bit-rate (being able to reach some Mbps by user) together with antenna dimensions and power outputs compatible with low cost high volume production. However, in order to ensure the tracking of non geo-stationary satellites and avoid the interruption of the communications when the traveling satellites are no more in visibility of the ground antenna, this one must present simultaneously two separate beams, at least for the time of change of satellites. In addition, the angular cover of these beams must be very broad. The Luneberg lens antenna [1] ensures multiple beams and the tracking of the satellites on a broad angular sector by the displacement of the transmitting/receiving sources in the focal surface of the lens. However, the manufacturing process of such a lens is particularly complex and expensive. So, the use of a homogeneous lens could be an interesting alternative. Nevertheless, a dielectric homogeneous lens does not allow the perfect focusing of plane waves, because of aberration phenomena. This makes more complex the design of fitted primary sources. The aim of this paper is to present the focusing properties of the spherical homogeneous lens by the complete characterization of the field patterns thanks to FEKO software, in order to design a primary source well matched to the homogeneous lens. The validation of the method will be also carried out while taking into account the coupling theory between a primary source and a system of focalization. Finally, results obtained with other software SRSR will be compared.
20th Annual Review of Progress in Applied Computational Electromagnetics
2004
April
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