jiro hirokawa

Two-Dimensional Rectangular-Coordinate Orthogonal Multiplexing Antenna Systems for Non-Far Field Region Communication

This talk presents an orthogonal multiplexing antenna system for non-far field region communication, which is based on two-dimensional polarity in the rectangular coordinate system. In other words, it is based on two-fold symmetry and anti-symmetry between the transmission modes. The two-dimensional polarity comes from the structural symmetry of magic-T components used in the corporate-feed circuit in the antenna in the millimeter-wave band. The structural symmetry gives wideband operation. The feasibility is shown by a system where a corporate-feed waveguide slot array antenna and a monopulse circuit are combined. We experimentally confirm 4-multiplex 40cm CW transmission using an 80GHz-band 16x16-slot waveguide array, 8-multiplex 20cm CW transmission using a 60GHz-band 16x16-slot dual-polarization waveguide slot array, and 2-multiplex 40cm QPSK transmission using a 60GHz- band 16x16-slot waveguide array.

Jiro HIROKAWA was born in Tokyo, Japan in 1965. He received the B.S., M.S., and D.E. degrees in electrical and electronic engineering from Tokyo Institute of Technology (Tokyo Tech), Tokyo, Japan in 1988, 1990, and 1994, respectively. He was a Research Associate from 1990 to 1996 and an Associate Professor from 1996 to 2015 at Tokyo Tech. He is currently a Professor there. He was with the antenna group of Chalmers University of Technology, Gothenburg, Sweden, as a Postdoctoral Fellow from 1994 to 1995. His current research interests include analyses, designs, and fabrication techniques of slotted waveguide array antennas, millimeter-wave, and Terahertz antennas, and beam-switching circuits. He has authored or co-authored more than 200 peer-reviewed journal papers and more than 600 international conference presentations. He served as an Associate Editor for IEICE Transactions on Communications during terms of 1999-2003 and 2004-2007. He also served as an Associate editor during 2013-2016 and as a Track Editor during 2016-2022 for IEEE Transactions on Antennas and Propagation. He serves as a Track Editor from 2023 for IEEE Antennas and Wireless Propagation Letters. He was the chair of the technical program committee for ISAP 2016. He was also the chair of IEICE technical committee on Antennas and Propagation from 2017 to 2019. He received IEEE AP-S Tokyo Chapter Young Engineer Award in 1991, Young Engineer Award from IEICE in 1996, Tokyo Tech Award for Challenging Research in 2003, Young Scientists' Prize from the Minister of Education, Cultures, Sports, Science and Technology in Japan in 2005, Best Paper Award in 2007 and a Best Letter Award in 2009 from IEICE Communications Society, and IEICE Best Paper Award in 2016 and 2018. He is a Fellow of IEEE and IEICE.