記述言語：日本語   出版者・発行元：2020 50th European Microwave Conference, EuMC 2020  

The concept of a power conversion chip integrated antenna (PIA) is proposed for microwave power transmission applications, eliminating the matching circuit between the power conversion chip and antenna to minimise the loss between them. A final stage power amplifier, which is one of the key components of the PIA, was designed and demonstrated. The fabricated 2.4-GHz 33-W GaN HEMT power amplifier demonstrated a drain efficiency of 82.3% and a power added efficiency of 78.8%. A power amplifier integrated antenna, i.e., quasi-PIA, was also demonstrated.

DOI： 10.23919/EuMC48046.2021.9338201

Scopus

記述言語：日本語   出版者・発行元：2020 IEEE International Symposium on Radio-Frequency Integration Technology, RFIT 2020  

A new power amplifier (PA) design method is proposed that eliminates the output-matching circuit to improve efficiency and is applied to a 2.4 GHz 33 W GaN HEMT PA for microwave wireless power transmission applications. The fabricated PA has a drain efficiency of 82.3% and a power-Added efficiency of 78.8%. The design parameters and the performance of the fabricated inverse class-F PA are also discussed analytically.

DOI： 10.1109/RFIT49453.2020.9226228

Scopus

記述言語：日本語   出版者・発行元：IEICE Electronics Express  

In this paper, we compare the distortion and power characteristics between AlGaN/GaN high-electron-mobility transistors (HEMTs) with different epi-structures. Third-order intermodulation distortion (IM3) measurement evaluates distortion characteristics, and on-wafer load and source-pull measurements evaluate the power performance. The results show that the AlGaN/GaN HEMTs directly fabricated on GaN substrates without nucleation layer perform better than those fabricated on SiC substrates. Furthermore, the distortion performance is compared with and without field plate.

DOI： 10.1587/ELEX.18.20210486

Scopus

記述言語：日本語   出版者・発行元：2020 4th Australian Microwave Symposium, AMS 2020  

Efficiency is critical element for microwave power amplifier, especially for energy applications. In this paper, the new design approach to enhance the efficiency which eliminates the output matching circuit is proposed. A 2.4GHz GaN power amplifier is demonstrated using the proposed design method. By eliminating the matching circuit and applying inverse class-F operation, the drain efficiency of 82.3% and power added efficiency of 78.8% are obtained for 30W power amplifier.

DOI： 10.1109/AMS48904.2020.9059420

Scopus

記述言語：日本語   出版者・発行元：Asia-Pacific Microwave Conference Proceedings, APMC  

Thermal S-parameters and its calculation method are proposed to design power amplifiers considering dynamic thermal response, and the method is applied to. 11ac WiFi PA design. The proposed method is much faster than commercially available method and useful for the practical power amplifier design.

DOI： 10.1109/APMC46564.2019.9038799

Scopus

開催年月日： 2023年3月

開催年月日： 2023年3月

開催年月日： 2023年3月

開催年月日： 2022年11月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（指名）  

国名：日本国  

開催年月日： 2022年9月