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http://hdl.handle.net/10071/6168
acessibilidade
Title: Compact Ka-band lens antennas for LEO satellites
Authors: Costa, Jorge R.
Fernandes, Carlos A.
Godi, Gaël
Sauleau, Ronan
Le Coq, Laurent
Legay, Hervé
Keywords: Beam shaping
Compact lens antennas
Constant flux illumination
Scanning antennas
Issue Date: May-2008
Publisher: IEEE
Abstract: Two new compact lens antenna configurations are presented and compared for data link communications with LEO satellites at 26 GHz. These lenses match a secant type radiation pattern template in the elevation plane while having a mechanically scanned sector beam in azimuth to enhance gain as much as possible. No rotary joints or multiple feeds are required and emphasis is put also on the compactness of the proposed solutions (< 6lambda0). Two alternative lens configurations are evaluated numerically and experimentally: one is based on modified axial-symmetric dome lens geometry, and the other one consists of a full 3-D double-shell lens antenna. In contrast to current nearly omnidirectional antennas, the directivity of our lens prototypes is above 15.4 dBi. Up to 4.2 dB loss obtained in the prototypes can be significantly reduced by using lower loss dielectrics and matching layers, without affecting the conclusions. The numerical and experimental results are in good agreement with the radiation specifications given the compact size of the antennas.
Description: WOS:000255985400006 (Nº de Acesso Web of Science)
Peer reviewed: Sim
URI: http://hdl.handle.net/10071/6168
ISSN: 0018-926X
Publisher version: The definitive version is available at: http://dx.doi.org/10.1109/TAP.2008.922690
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica
IT-RI - Artigo em revista internacional com arbitragem científica

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