Cassegrain Antenna With Hybrid Beam Steering Scheme for Mobile Satellite Communications
Cassegrain Antenna With Hybrid Beam Steering Scheme for Mobile Satellite Communications
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DOI：
10.1109/tap.2009.2016706
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发表时间：
2009-05
影响因子：
5.7
通讯作者：
Young-Bae Jung;A. Shishlov;Seong‐Ook Park
中科院分区：
文献类型：
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作者：
Young-Bae Jung;A. Shishlov;Seong‐Ook Park
提出了一种改进波束控制方法的混合天线。该天线具有由两个反射器和一个馈线组成的卡塞格伦结构。抛物线形主反射器被设计用于高增益，而副反射器是旋转的和平坦的。馈线是具有任意形状孔径和20个单元天线的相控阵。HA能够通过两个操作实现二维波束转向：副反射器的旋转和馈电阵列的相位控制。副反射镜体积小、重量轻，可提供快速光束扫描。HA被设计成装载在车辆中，并可以通过跟踪馈源阵列的波束控制与移动中的卫星进行通信。HA的原型是使用由计算机数控操作的加工中心用铝制造的。原型在Ka波段TX和K波段RX下工作，增益分别为47 dBi和44.4 dBi，转向角为0度。通过副反射器和馈源阵列实现了相对于45 °仰角在± 2 °范围内的二维波束转向。波束控制区中的所有辐射图符合ITU-R s.465-5规定。
A hybrid antenna (HA) with a modified beam steering method is proposed. This antenna has a Cassegrain structure composed of two reflectors and a feeder. The parabolic-shaped main reflector is designed for high gain, while the subreflector is rotational and flat. The feeder is a phased array with arbitrary shaped aperture and 20 element antennas. The HA is capable of two-dimensional beam steering by means of two operations: rotation of the subreflector and phase control of the feed array. The subreflector is small in size and weight, so it can provide rapid beam scanning. Designed to be loaded in vehicles, the HA and can communicate with satellites on the move by tracking the beam control of the feed array. A prototype of the HA is fabricated with aluminum using a machining center operated by computerized numerical control. The prototype is operated at Ka-band for TX and K-band for RX with gains of 47 dBi and 44.4 dBi, respectively, at a steering angle of 0 deg. The two-dimensional beam steering within plusmn2deg with respect to 45deg elevation is realized by the subreflector and feed array. All radiation patterns in the beam steering zone meet ITU-R s.465-5 regulations.