Nominated to the Best Paper Award (Five finalist papers) in the category “Antennas”, at the European Conference on Antennas and Propagation, EuCAP 2020, 15-20 March 2020: A. Alvarez Melcon and J.S. Gomez-Diaz. “Nonreciprocal Antennas Based on Time-Modulation: Challenges and Opportunities”. Proceedings EuCAP 2020 , Paper No. 1570602762, Copenhagen, Denmark, 15-20 March 2020.