He has published over 330 articles in peer-reviewed journals and 11 books/book chapters, including the Low-Profile Natural and Metamaterial Antennas (IEEE Press, Wiley, 2016). His significant contributions are the development of five integral equations for line antennas in free space and printed on a dielectric substrate, the invention of an L-shaped wire/strip antenna feeding method, and the realization of numerous wideband antennas, including curl, metaspiral, metahelical, and body of revolution antennas. His other accomplishments include design of antennas for GPS, personal handy phones, space radio, electronic toll collection, RFID, UWB, and radar. He has been awarded 78 patents, including Curl Antenna Element and Its Array, Japan. His research interests include numerical methods for low- and high-frequency antennas and optical waveguides. He has served as a member of the IEEE APS Administrative Committee, from 2000 to 2002, and a Region 10 Representative, from 2001 to 2010. He received the H. A. Wheeler Award, in 1994, the Chen-To Tai Distinguished Educator Award, in 2006, and the Distinguished Achievement Award, in 2016, all from the IEEE Antennas and Propagation Society. He was also a recipient of The Prize for Science and Technology from the Japan’s Minister of Education, Culture, Sports, Science and Technology, in 2010. Most recently, he was selected as a recipient of the Antenna Award of the European Association on Antennas and Propagation (EurAAP), in 2020. He is an Associate Editor of several scientific journals and magazines, such as Electromagnetics and the IEEE Antennas and Propagation Magazine