Abstract
As the market continues to grow for high capacity frequency reuse satellite designs, more and more spacecraft will encounter low order Passive Intermodulation (PIM) products. Trends are emerging in integrating multiple communication payload systems into a single spacecraft and incorporating more flexible communication payloads in our next generation spacecraft designs, thus yielding 3 rd and 5 th order PIM products as potential threat for satellite operation. Additionally, smaller uplink stations require spacecraft which can support lower uplink flux densities and higher G/T, which further exasperates the PIM problem. For quite some time we have been designing for and managing 3 rd order PIM product satellite systems for multiple applications; however, the current trends will be pushing the limits of existing technology. Therefore, SSL initiated a PIM test characterization program to better identify the effects of PIM in the communication satellite application. This paper focuses on multicarrier excitation of our transmit signals, the resulting PIM products generated into the satellite’s sensitive receive band, and some test findings to help determine more accurately the level of PIM threat.
Published Version
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