Development of a very low-cost down converter for the IEEE802.11ad wireless network appliance test. - Kohei Fujiwara; Nobuhiko Shibagaki; Takeshi Kobayashi; Hiroshi Hanyu (RWS, 2015)

Low transmission loss, simple, and broadband waveguide-to-microstrip line transducer in V-, E- and W-band. - Kohei Fujiwara; Takeshi Kobayashi (IEICE Electron. Express, 2017)

High-stability, high-signal-quality radio-over-fiber system for IEEE802.11ad packet transmission based on optical single-sideband modulation in W-band. - Kohei Fujiwara; Atsushi Kanno; Kouichi Tokita (IEICE Electron. Express, 2021)

Six-port type reflectometer based on reflection measurement system using a standing wave detector in the V-band. - Kohei Fujiwara; Tokita Kouichi; Toshiyuki Yakabe (IEICE Electron. Express, 2021)