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Riel M.,MDA Corporation Space Missions | Brand Y.,EUTELSAT S.A. | Demers Y.,MDA Corporation Space Missions | De Maagt P.,European Space Agency
EuCAP 2010 - The 4th European Conference on Antennas and Propagation | Year: 2010

The struts supporting the feed in a center-fed antenna are known to generate scattered fields, therefore causing degradations in antenna performance such as increased sidelobe levels and peak gain reductions. In this paper, two different configurations of low scattering struts using hard electromagnetic surfaces have been designed and fabricated for Ku-band operation in a center-fed reflector antenna configuration. Compared to conventional metallic triangular rooftop cross-section struts, these two low scattering strut designs significantly improve the forward scattering performance in TM polarization over a large relative bandwidth. Measurements performed on a Ku-band center-fed reflector antenna with four hard surface low scattering struts show significant sidelobe level reductions, compared to the same antenna measured with four conventional metallic triangular rooftop cross-section struts. Detailed comparisons between measurements and predictions are presented. Source


Riel M.,MDA Corporation Space Missions | Brand Y.,MDA Corporation Space Missions | Brand Y.,EUTELSAT S.A. | Demers Y.,MDA Corporation Space Missions | De Maagt P.,European Space Agency
IEEE Transactions on Antennas and Propagation | Year: 2012

Conventional metallic struts used to support the feed in center-fed reflector antennas can significantly degrade the sidelobe, directivity and cross-polarization performances of the antenna. A promising approach to improve center-fed antenna performance is to use low scattering struts made of a metallic core covered with hard electromagnetic surfaces. In this paper, the performance improvements achievable by replacing conventional metallic struts by low scattering struts are studied for two space-based center-fed reflector antenna applications: a Ku-Band satellite communication antenna and the Sentinel-3 satellite C-Band/Ku-Band radar altimeter antenna. Measurements performed on these antennas show significant performance improvements (sidelobe levels, peak directivity, cross-polarization levels) when using the designed low scattering struts compared to using the conventional state of the art metallic struts. Two different configurations of low scattering struts using hard electromagnetic surfaces have been studied: a One Layer design using a single layer of dielectric material and a novel Two Layer design using two layers of dielectric. The performance improvements obtained with both designs are presented and discussed. Detailed comparisons between measurements and predictions are also presented. © 2006 IEEE. Source

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