A 90-GHz InP-HEMT lossy match amplifier with a 20-dB gain using a broadband matching technique. - Yusuke Inoue 003; Masaru Sato 001; Toshihiro Ohki; Kozo Makiyama; Tsuyoshi Takahashi; Hisao Shigematsu; Tatsuya Hirose (IEEE J. Solid State Circuits, 2005)

Millimeter-Wave GaN HEMT for Power Amplifier Applications. - Kazukiyo Joshin; Kozo Makiyama; Shiro Ozaki; Toshihiro Ohki; Naoya Okamoto; Yoshitaka Niida; Masaru Sato 001; Satoshi Masuda; Keiji Watanabe (IEICE Trans. Electron., 2014)

Remarkable Current Collapse Suppression in GaN HEMTs on Free-standing GaN Substrates. - Yusuke Kumazaki; Keiji Watanabe; Toshihiro Ohki; Junji Kotani; Shiro Ozaki; Yoshitaka Niida; Kozo Makiyama; Yuichi Minoura; Naoya Okamoto; Norikazu Nakamura (BCICTS, 2019)

Recent Progress on High Output Power, High Frequency and Wide Bandwidth GaN Power Amplifiers. - Masaru Sato 001; Yoshitaka Niida; Atsushi Yamada; Junji Kotani; Shiro Ozaki; Toshihiro Ohki; Naoya Okamoto; Norikazu Nakamura (IEICE Trans. Electron., 2021)

Uniform/Selective Heating Microwave Oven Using High Efficiency GaN-on-GaN HEMT Power Amplifier. - Masaru Sato 001; Yusuke Kumazaki; Naoya Okamoto; Toshihiro Ohki; Naoko Kurahashi; Masato Nishimori; Atsushi Yamada; Junji Kotani; Naoki Hara; Keiji Watanabe (IEICE Trans. Electron., 2023)

High-Efficiency 250-320GHz Power Amplifiers Using InP-Based Metal-Oxide-Semiconductor High-Electron-Mobility Transistors. - Yusuke Kumazaki; Shiro Ozaki; Naoya Okamoto; Naoki Hara; Yasuhiro Nakasha; Masaru Sato 001; Toshihiro Ohki (IEICE Trans. Electron., 2023)

Sub-THz SC-FDE MIMO Systems with Deep Neural Network Equalization for 100 Gbps of 6G. - Liang Zhou; Masafumi Tsutsui; Yasuhiro Nakasha; Shiro Ozaki; Takashi Dateki; Yusuke Kumazaki; Toshihiro Ohki (VTC Fall, 2024)

A 9.3% PAE, 9.2-dBm POUT power amplifier and -1.9-dB Gc upconverting mixer using InP-based MOS HEMTs for 300-GHz phased-array transmitters. - Yasuhiro Nakasha; Shiro Ozaki; Yusuke Kumazaki; Naoya Okamoto; Shoichi Shiba; Masaru Sato 001; Naoki Hara; Toshihiro Ohki (IEICE Electron. Express, 2025)