Fraunhofer IIS researchers developed a special antenna array as part of the ESA's (European Space Agendy) ROAA (Radio Occultation Antenna Array) project. The challenge involved finding a way to precisely measure the earth's atmosphere from space. One approach is through radio occultation, a process that uses radio signals to measure atmospheric properties such as pressure, temperature and water vapor content.
Thanks to its unique geometry, ROAA is capable of receiving satellite (GPS and Galileo) signals. The antenna array developed by Fraunhofer IIS boasts optimal directional properties, superior impedance matching and a compact, lightweight design.