Direction-of-Arrival Estimation System for Multipath Propagation in Code-Division Multiple-Access Systems With Synthesized Virtual Planar Array Using Pilot Signals. - Akimichi Hirota; Hiroyuki Arai; Masayuki Nakano (IEEE Trans. Veh. Technol., 2008)

A directivity enhancement for directional couplers using additional coupled lines. - Hideharu Yoshioka; Akimichi Hirota; Hidenori Ishibashi; Naofumi Yoneda; Moriyasu Miyazaki (IEICE Electron. Express, 2016)

Design of the Circularly Polarized Ring Microstrip Antenna with Shorting Pins. - Jun Goto; Akimichi Hirota; Kyosuke Mochizuki; Satoshi Yamaguchi; Kazunari Kihira; Toru Takahashi 005; Hideo Sumiyoshi; Masataka Otsuka; Naofumi Yoneda; Jiro Hirokawa (IEICE Trans. Commun., 2022)