高通量卫星多波束天线馈电系统PIM控制技术

PIM control technology for feed chain of multibeam antenna in high throughput satellite

介绍了无源互调(PIM)产生的机理和控制方法,重点研究了高通量卫星多波束天线馈电系统PIM控制技术,通过采用馈电系统高隔离度优化设计、馈源单元法兰面扼流槽设计、馈源阵安装板PIM源控制设计、Ka频段PIM试验系统低PIM设计等手段,将某Ka频段多波束天线馈电单元的7阶PIM性能控制在高低温(-60~+100℃)环境下≤-135 dBm,馈源阵7阶PIM性能控制在常温状态下≤-140 dBm。产品的实际应用验证了所述PIM控制技术的有效性,在工程问题中起到指导作用。

Principles of Passive Intermodulation(PIM)production and its control method are introduced.After mainly researching and applying the PIM control technologies for the feed chain of multibeam antenna in high throughput satellite,including optimal design of high isolation of feed system,flange face choke of feed unit,PIM source control of feed array mounting plate,low PIM design of Ka-band PIM test system,etc.,a Ka-band multibeam antenna achieves the goals that the 7th order PIM performance of the feed unit is controlled to≤-135 dBm at temperatures between-60℃and+100℃,and the performance of the feed array is controlled to≤-140 dBm at normal temperature.The application of the product demonstrates the validity of the proposed technology for PIM control,which is of benefit to high performance antenna design.