Large angular electronic beam steering antenna for space application

IEEE Antennas and Propagation Society International Symposium 1992 Digest Pub Date : 1992-06-18 DOI:10.1109/APS.1992.222021

R. Lenormand, B. Coulomb, C. Feat, C. Rigal, Y. Roussin, B. Vidal St. Andre, C. Villemur

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Abstract

In order to replace a large phased array, antenna subsystems usually combine a large reflector, a small phased array, and an arrangement of small reflectors, which form a large image of the array over the main reflector aperture. This way one can get a large-aperture electronically steerable antenna, using only a small phased array. The basic idea of such an antenna is to use the two offset fed paraboloidal reflectors in such a way that the off-axis aberrations tend to cancel each other. The implementation of a correcting lens in the common focal plane is proposed. The objective is to enlarge the off-axis aberration matching domain, so that the scanning capability is increased (15 beamwidth/40 beamwidth). As an application, a Ka-band mission is discussed for a 3-m-diameter antenna (26 GHz) with a field of view of +or-10 degrees as required for the Data Relay Satellite. It is confirmed that the scanning limitation of the offset fed Gregorian antenna has been relaxed from approximately 15 beamwidth to 40 beamwidth by the use of a corrective lens implemented in the common focal area.<>

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空间应用大角电子束转向天线

为了取代大型相控阵，天线子系统通常将一个大型反射器、一个小型相控阵和一组小型反射器组合在一起，在主反射器孔径上方形成阵列的大像。这种方法可以得到一个大孔径的电子操纵天线，只使用一个小相控阵。这种天线的基本思想是使用两个偏置馈电抛物面反射器，使离轴像差趋于相互抵消。提出了一种在共焦平面上的校正透镜的实现方法。目标是扩大离轴像差匹配域，从而提高扫描能力(15波束宽度/40波束宽度)。作为应用，讨论了数据中继卫星所需的3米直径(26 GHz)天线的ka波段任务，视场为+或10度。通过在共焦区域使用校正透镜，证实了偏移馈电格里高利天线的扫描限制已经从大约15波束宽度放宽到40波束宽度

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IEEE Antennas and Propagation Society International Symposium 1992 Digest

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