An EMC retrofit to reduce radiated emission levels in housings/enclosures of space-borne systems

In this paper, an EMC design retrofit has been proposed for improving the compliance of unit housings in a space-borne systems in accordance with EMC standards followed in space industry i.e. MIL-STD-461E/F. It has been shown that by loading the slots in the housings with metal wires, the radiated emissions from the enclosure can be significantly reduced. One significant advantage of loading the slots with wires is that this technique can be adopted without making any additional design change in the housing or enclosure. Loading slots with multiple wires eliminates slot cavity resonances and emissions at cavity mode resonance frequencies can be reduced by as much as 70dBμV/m on average. The technique is useful at post fabrication stage of enclosure to eliminate the peaks at resonant frequencies and bring down the level of radiated emission below threshold values as defined by various standards.