双馈源双偏置结构星载通信多波束天线

Multi-Beam Antenna with Double Feeds and Dual-Offset Configuration for Space-Borne Communication

为了使星载通信天线产生赋形波束的同时,又能辐射具有扫描特性的点波束满足特殊情形下的通信要求,提出了一种以单馈源赋形反射面天线为基础,利用另一个馈源进行副反射面赋形,补偿主反射面口径相位差的方法,从而形成高效率点波束,并通过副反射面及对应馈源横向偏焦实现点波束扫描的目的。为了检验方法的有效性,仿真实验了一副口径为2.2 m的赋形反射面天线。实验结果表明：赋形波束在服务区内部的最小增益是30.0 dBi,点波束在服务区内部及周边区域扫描时具有比赋形波束更高的增益,因此,所提方法是有效的。

In order to simultaneously generate shaped beam and spot beams with scanning characteristics to meet the special requirements for space-borne communication antenna. A method using a sub-reflector to compensate phase difference on the aperture of main reflector is proposed,which is based on a shaped reflector with a single-feed. Another feed is used to shape sub-reflector,thereby forming a high efficiency spot beam. The function of scanning is achieved by lateral focusing of sub-reflector and the corresponding feed. To test effectiveness of this method,a shaped reflector antenna with a 2.2 m diameter aperture is simulated. The experimental results show that the minimum gain of shaped beam covering service area is 30.0 dBi and the gains of the spot beam scanning inside and outside the service area are even higher. The effectiveness of this method is demonstrated.