The CHEOPS satellite in the Maxwell test facility
The science instrument of the CHEOPS satellite is protected by a plastic dust cover, whereas the exposed side panels of the spacecraft platform reflect the blue foam pyramids lining the walls of the Maxwell EMC facility. The resistive, carbon-loaded foam pyramids are shaped to cause multiple reflections that attenuate incident radio-frequency waves. Beneath the foam pyramids, the walls of the chamber are lined with steel panels that form a so-called 'Faraday cage' to keep test signals in and parasitic radiation out. Different types of test antenna, each covering different frequency ranges, can be seen on tripods to the left.