Nelson J. G. Fonseca (nelson.fonseca@esa.int) is working as an Antenna Engineer for the Antenna and Sub-Millimetre Waves Section, European Space Agency (ESA), Noordwijk, The Netherlands. Since November 2020, he has held an Honorary Appointment as a Professional Fellow at the University of Technology Sydney (UTS), Australia. His research interests include multiple beam antennas for space missions, beam-former theory and design, ground terminal antennas, transfer of technology from and to terrestrial systems, including 5G networks, and novel manufacturing techniques. He has authored or co-authored more than 240 papers in peer-reviewed journals and conferences and has over 50 patents issued or pending.