Compact 1.5GHz to 2.5GHz multi-band multi-mode power amplifier. - Takayuki Furuta; Atsushi Fukuda; Kunihiro Kawai; Hiroshi Okazaki; Shoichi Narahashi (IEICE Electron. Express, 2011)

Tunable Resonator Employing Comb-shaped Transmission Line and Semiconductor Switches. - Kunihiro Kawai; Daisuke Koizumi; Hiroshi Okazaki; Shoichi Narahashi (IEICE Trans. Electron., 2014)

Theoretical Analysis of Center Frequency and Bandwidth Tunable Resonator Employing Coupled Line and Switches. - Kunihiro Kawai; Hiroshi Okazaki; Shoichi Narahashi; Mizuki Motoyoshi; Noriharu Suematsu (IEICE Trans. Electron., 2019)

Resonant Frequency and Bandwidth Tunable Ring Resonator Using GaAs FET SPST Switches. - Kunihiro Kawai; Hiroshi Okazaki; Shoichi Narahashi; Noriharu Suematsu (IEICE Trans. Electron., 2019)