DFH-2A国内通信卫星天线系统

叙述了为国内电信服务的机械消旋卫星天线系统.该天线系统包括三部分:全向遥测遥控天线组件,定向通信天线和三信道无接触旋转关节.遥测遥控天线为双圆盘天线,辐射全向性方向图,圆极化.通信天线是收发共用单喇叭馈源偏置椭圆抛物面天线,辐射一个5°×8°的椭圆波束,恰好覆盖中国本土.三信道无接触旋转关节是一个同心三同轴线结构,形成三路传输信道.各同轴线旋转连接处有扼流槽.各信道的插入损耗为0.6～0.8dB,信道之间隔离优于50dB.

AN ANTENNA SYSTEM FOR DFH-2A DOMESTIC TELECOMMUNICATIONS SATELLITE

This paper describes a mechanically despun satellite antenna system for the domestic telecommunication service. The antenna system consists of three parts: an assembly of the omnidirectional telemetry and command antennas, a directive communications antenna and a three channel noncontacting rotary joint. The telemetry and command antennas are antennas, the radiation patterns of which are omnidirectional patterns with the circular polarization. The directive communications antenna is a offset elliptical paraboloid antenna with single horn feed for both transmiting and receiving. A 5°×8° elliptical beam radiated by the paraboloid antenna provides proper coverage over China's mainland. The three channel noncontacting rotary joint is a concentric three coaxial line configuration, which forms three transmission channels. There are chokes at the rotary join of each coaxial line. The channel insertion losses of the rotary joint are 0.6～0.8dB. The isolations between the channels are greater than 50dB.