For more than 40 years Lars Josefsson was with Ericsson Microwave Systems AB in Mölndal, Sweden, where he became responsible for new antenna technology and systems, internal R&D projects and internal education relating to antennas. In 2003 he formed his own consulting company: Lars Microwave. In 2004 he received the Thulin Silver Medal from the Swedish Aeronautical Society for his contributions to several generations of airborne radar antenna developments. He is the author and co-author of more than 100 scientific publications on antenna technology.Sembiam R. Rengarajan is a Professor at California State University, Northridge, USA. In addition to teaching electromagnetics and antenna courses, he has performed significant research in topics on applications of electromagnetics to antennas, scattering, and microwave components. Much of his research has dealt with slotted waveguide array antennas. He has published more than 240 journal articles and conference presentations, and serves as the Chair of USNC-URSI.