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Author(s): Costa, Jorge R.
Fernandes, Carlos A.
Godi, Gaël
Sauleau, Ronan
Le Coq, Laurent
Legay, Hervé
Date: May-2008
Title: Compact Ka-band lens antennas for LEO satellites
Volume: 56
Number: 6
Pages: 1251-1268
Reference: Costa, J., Fernandes, C., Godi, G., Sauleau, R., Le Coq, L., & Legay, H. (2008). Compact Ka-band lens antennas for LEO satellites. IEEE Transactions on Antennas and Propagation, 56(6), 1251-1268.
ISSN: 0018-926X
Keywords: Beam shaping
Compact lens antennas
Constant flux illumination
Scanning antennas
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.
Peerreviewed: Sim
Access type: Open Access
Appears in Collections:CTI-RI - Artigos em revistas científicas internacionais com arbitragem científica
IT-RI - Artigos em revistas científicas internacionais com arbitragem científica

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