Co-Design of Thermal and RF Performance in a Stacked Sub-THz Antenna-in-Package With Embedded Endfire Arrays

Ryosuke Hasaba, Akihiro Egami, Yohei Morishita, Tomoki Abe, Ken Takahashi, Tomohiro Murata, Masatoshi Suzuki, Yoichi Nakagawa, Yudai Yamazaki, Sunghwan Park, Takaya Uchino, Chenxin Liu, Jun Sakamaki, Alberto Hernández-Escobar, Makoto Tsukahara, Hiroshi Taneda, Kei Murayama, Shinsuke Hara, Issei Watanabe, Hiroyuki Sakai, Takashi Tomura, Kenichi Okada

IEEE Transactions on Microwave Theory and Techniques   2026.1

A 142–164-GHz Phased-Array AiP Module With High-Power-Density and High-Efficiency Transceiver in 65-nm CMOS for 6G UE

Yudai Yamazaki, Yohei Morishita, Sunghwan Park, Takaya Uchino, Chenxin Liu, Jun Sakamaki, Akihiro Egami, Ryosuke Hasaba, Ken Takahashi, Tomoki Abe, Tomohiro Murata, Yoichi Nakagawa, Takashi Tomura, Hiroshi Taneda, Kei Murayama, Makoto Tsukahara, Hiroko Ota, Yoko Nakabayashi, Ryuji Kinugawa, Takumi Kojima, Anyi Tian, Kotaro Ito, Chun Wang, Hans Herdian, Yi Zhang, Zheng Li, Wenqian Wang, Hongye Huang, Dingxin Xu, Sena Kato, Michihiro Ide, Shinsuke Hara, Issei Watanabe, Akifumi Kasamatsu, Yuncheng Zhang, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Koji Takinami, Kenichi Okada

IEEE Journal of Solid-State Circuits   2026

A 52Gb/s 8.9-dBm EIRP 300-GHz-Band Amplifier-Last Outphasing Transmitter With Path Mismatch Calibration in 65-nm CMOS

Chun Wang, Olivia Angel Yong, Hans Herdian, Wenqian Wang, Abanob Shehata, Carrel da Gomez, Chenxin Liu, Yudai Yamazaki, Kazuaki Kunihiro, Hiroyuki Sakai, Yuncheng Zhang, Atsushi Shirane, Kenichi Okada

IEEE Journal of Solid-State Circuits   1 - 14   2026

A Ka-Band Time-Modulated Phase-Invariant Variable-Gain Amplifier With 30-dB Gain Tuning Based on Duty-Cycle Control

Dongfan Xu, Minzhe Tang, Haiyun Gu, Yuxuan Liu, Yilun Chen, Ziyuan Ren, Minghao Fan, Daxu Zhang, Yi Zhang, Duo Li, Zheng Li, Zezheng Liu, Chun Wang, Yudai Yamazaki, Yuncheng Zhang, Kazuaki Kunihiro, Hiroyuki Sakai, Atsushi Shirane, Kenichi Okada

IEEE Journal of Solid-State Circuits   1 - 13   2026

A High-Efficient 154GHz 4TX/4RX FMCW Radar Chipset in 65nm CMOS

Sunghwan Park, Yudai Yamazaki, Carrel de Gomez, Chenxin Liu, Jun Sakamaki, Hiroyuki Sakai, Kazuaki Kunihiro, Kenichi Okada

2025 IEEE Asian Solid-State Circuits Conference (A-SSCC)   1 - 3   2025.11

Evaluation of Stacked Structure for 160 Ghz End-Fire Type Compact Antenna-in-Package Considering Thermal Design

Ryosuke Hasaba, Akihiro Egami, Yohei Morishita, Tomoki Abe, Ken Takahashi, Tomohiro Murata, Masatoshi Suzuki, Yoichi Nakagawa, Yudai Yamazaki, Sunghwan Park, Takaya Uchino, Chenxin Liu, Jun Sakamaki, Takashi Tomura, Hiroyuki Sakai, Makoto Tsukahara, Kenichi Okada, Koji Takinami

2025 IEEE/MTT-S International Microwave Symposium - IMS 2025   663 - 666   2025.6

A 640-Gb/s 4 × 4-MIMO D-Band CMOS Transceiver Chipset

Chenxin Liu, Zheng Li, Yudai Yamazaki, Hans Herdian, Chun Wang, Anyi Tian, Jun Sakamaki, Han Nie, Xi Fu, Sena Kato, Wenqian Wang, Hongye Huang, Minzhe Tang, Dingxin Xu, Shinsuke Hara, Akifumi Kasamatsu, Takashi Tomura, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

IEEE Journal of Solid-State Circuits   2025.4

11.1 A 256-Element Ka-Band CMOS Phased-Array Receiver Using Switch-Type Quadrature-Hybrid-First Architecture for Small Satellite Constellations

Sena Kato, Jill Mayeda, Keito Yuasa, Michihiro Ide, Takeshi Ota, Shu Date, Yudai Yamazaki, Xiaolin Wang, Xi Fu, Dongwon You, Makoto Higaki, Jumpei Sudo, Hiroshi Takizawa, Masashi Shirakura, Takashi Tomura, Hiroyuki Sakai, Kazuaki Kunihiro, Kenichi Okada, Atsushi Shirane

2025 IEEE International Solid-State Circuits Conference (ISSCC)   1 - 3   2025.2

A D-Band CMOS Transceiver Chipset Supporting 640Gb/s Date Rate with 4?4 Line-of-Sight MIMO

Chenxin Liu, Zheng Li, Yudai Yamazaki, Hans Herdian, Chun Wang, Anyi Tian, Jun Sakamaki, Han Nie, Xi Fu, Sena Kato, Wenqian Wang, Hongye Huang, Shinsuke Hara, Akifumi Kasamatsu, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

Proceedings of the 30th Asia and South Pacific Design Automation Conference   354 - 355   2025.1

A 160-Gb/s D-Band Bi-Directional CMOS Mixer Covering 112–170 GHz for 6G Transceivers

Chenxin Liu, Yudai Yamazaki, Anyi Tian, Chun Wang, Hans Herdian, Abanob Shehata, Han Nie, Minzhe Tang, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

IEEE Solid-State Circuits Letters   2025

A Compact D-Band Phase Shifter With 0.1-Degree Phase Resolution and Ultra-Low Phase Error in 65-nm CMOS

Takaya Uchino, Yudai Yamazaki, Anyi Tian, Chenxin Liu, Sunghwan Park, Abanob Shehata, Sena Kato, Takumi Kojima, Haruto Tanaka, Masayuki Kikuchi, Jill Mayeda, Ryuji Kinugawa, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

IEEE Journal of Solid-State Circuits   2025

150 GHz-Band Compact Phased-Array AiP Module for XR Applications Toward 6G

Yohei Morishita, Ken Takahashi, Ryosuke Hasaba, Akihiro Egami, Tomoki Abe, Masatoshi Suzuki, Tomohiro Murata, Yoichi Nakagawa, Yudai Yamazaki, Sunghwan Park, Takaya Uchino, Chenxin Liu, Jun Sakamaki, Takashi Tomura, Hiroyuki Sakai, Hiroshi Taneda, Kei Murayama, Yoko Nakabayashi, Shinsuke Hara, Issei Watanabe, Akifumi Kasamatsu, Kenichi Okada, Koji Takinami

IEEE Microwave and Wireless Technology Letters   2025

Packaging Technology for Sub-Terahertz Antenna in Module

Kei Murayama, Hiroshi Taneda, Makoto Tsukahara, Ryosuke Hasaba, Yohei Morishita, Yudai Yamazaki, Kenichi Okada, Yoko Nakabayashi

2024 IEEE 26th Electronics Packaging Technology Conference (EPTC)   178 - 182   2024.12

A Compact D-Band Phase Shifter with 0.1-degree Phase Resolution and 0.8-degree RMS Phase Error in 65 nm CMOS

Takaya Uchino, Yudai Yamazaki, Sungwan Park, Chenxin Liu, Anyi Tian, Abanob Shehata, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

2024 IEEE Asian Solid-State Circuits Conference (A-SSCC)   1 - 3   2024.11

A 640-Gb/s $4\times 4$-MIMO D-Band CMOS Transceiver Chipset

Chenxin Liu, Zheng Li, Yudai Yamazaki, Hans Herdian, Chun Wang, Anyi Tian, Jun Sakamaki, Han Nie, Xi Fu, Sena Kato, Wenqian Wang, Hongye Huang, Shinsuke Hara, Akifumi Kasamatsu, Hiroyuki Sakai, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

2024 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)   1 - 2   2024.6

A 37–43.5-GHz Phase and Amplitude Detection Circuit With 0.049° and 0.036-dB Accuracy for 5G Phased-Array Calibration Using Transformer-Based Injection-Enhanced ILFD

Yudai Yamazaki, Jun Sakamaki, Jian Pang, Joshua Alvin, Zheng Li, Dongwon You, Jill Mayeda, Atsushi Shirane, Kenichi Okada

IEEE Journal of Solid-State Circuits   2023.10

A 39-GHz CMOS Bidirectional Doherty Phased- Array Beamformer Using Shared-LUT DPD With Inter-Element Mismatch Compensation Technique for 5G Base Station

Zheng Li, Jian Pang, YI ZHANG, Yudai Yamazaki, Qiaoyu Wang, Peng Luo, Weichu Chen, Yijing Liao, Minzhe Tang, Yun Wang, Xi Fu, Dongwon You, Naoki Oshima, Shinichi Hori, Jeehoon Park, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

IEEE Journal of Solid-State Circuits   2023.4

A 28GHz High-Accuracy Phase and Amplitude Detection Circuit for Dual-Polarized Phased-Array Calibration

Yudai Yamazaki, Joshua Alvin, Jian Pang, Atsushi Shirane, Kenichi Okada

IEICE TRANSACTIONS ON ELECTRONICS   E106C ( 4 )   149 - 156   2023.4

A 37-39GHz Phase and Amplitude Detection Circuit with 0.060 degree and 0.043dB RMS Errors for the Calibration of 5GNR Phased-Array Beamforming

Yudai Yamazaki, Jun Sakamaki, Jian Pang, Joshua Alvin, Zheng Li, Atsushi Shirane, Kenichi Okada

2022 IEEE Asian Solid-State Circuits Conference (A-SSCC)   1 - 3   2022.11

A 39-GHz CMOS Bi-Directional Doherty Phased-Array Beamformer Using Shared-LUT DPD with Inter-Element Mismatch Compensation Technique for 5G Base-Station

Zheng Li, Jian Pang, Yi Zhang, Yudai Yamazaki, Qiaoyu Wang, Peng Luo, Weichu Chen, Yijing Liao, Minzhe Tang, Zhengyan Guo, Yun Wang, Xi Fu, Dongwon You, Naoki Oshima, Shinichi Hori, Kazuaki Kunihiro, Atsushi Shirane, Kenichi Okada

2022 IEEE Symposium on VLSI Technology and Circuits (VLSI Technology and Circuits)   98 - 99   2022.6

A 1.8-67GHz Divide-by-4 ILFD Using Area-Efficient Transformer-Based Injection-Enhancing Technique

Yudai Yamazaki, Jian Pang, Atsushi Shirane, Kenichi Okada

ESSCIRC 2022- IEEE 48TH EUROPEAN SOLID STATE CIRCUITS CONFERENCE (ESSCIRC)   393 - 396   2022

A 39GHz Divide-by-8 LC-Ring ILFD Designed for 5G New Radio n260 Band

Yudai Yamazaki, Joshua Alvin, Jian Pang, Atsushi Shirane, Kenichi Okada

2021 IEEE International Conference on Integrated Circuits, Technologies and Applications (ICTA)   74 - 75   2021.11

IEEE ISSCC Student Research Preview Poster Award

2026.2   IEEE International Solid-State Circuits Conference (ISSCC)   "A High-Power-Density D-Band Phased-Array Transceiver in 65nm CMOS for 6G UE Module"

文部科学大臣賞

2025.7   産経新聞社   「次世代無線端末の実現に向けた超小型サブテラヘルツ半導体無線機」

Best Student Paper Award Finalist

2025.6   2025 Symposium on VLSI Technology and Circuits   "A 150 GHz High-Power-Density Phased-Array Transceiver in 65nm CMOS for 6G UE Module"

若手研究会優秀ポスター賞

2025.5   電子情報通信学会 (IEICE) 集積回路研究会 (ICD)   「第6世代移動通信システムに向けた高精度D-Band移相器」

内野 攻哉, 山崎 雄大, Park Sungwan, Liu Chenxin, 田安 宜, Abanob Shehata, 酒井 啓之, 國弘 和明, 白根 篤史, 岡田 健一

2023年度論文賞

2024.6   電子情報通信学会 (IEICE)  

VDECデザインアワード優秀賞

2023.9   d.lab-VDECデザインフォーラム  

IEEE SSCS Japan Chapter VDEC Design Award

2023.9   d.lab VDECデザインフォーラム  

修士優秀論文賞

2023.3   東京工業大学工学院電気電子系  

LSIとシステムのワークショップ優秀ポスター賞

2021.5   電子情報通信学会 (IEICE)  

学士優秀論文賞

2021.3   東京工業大学 工学院電気電子系