"西田大祐,西方敦博,山本 泰義,俊長 秀紀,北 直樹","凸レンズ状移相量分布を与えたVan Attaアレー再帰反射体による近距離領域利得の改善効果の検討","電子情報通信学会 環境電磁工学研究会","信学技報",,,,,2024,Jan.
"Qi Li,Jiro Hirokawa,Takashi Tomura,Yuta Takahashi,Naoki Kita,Nelson J. G. Fonseca","A Two-Dimensional 6×4-Way Hollow Waveguide Beam-Switching Matrix",,"IEEE Access",,"vol. 11",,"pp. 74239-74249",2023,July
"西田大祐,西方敦博,山本 泰義,?橋 雄太,北 直樹","二次元Van Attaアレーの素子間結合を考慮した散乱特性の回路論的計算","電子情報通信学会 環境電磁工学研究会","信学技報",,,,"pp. 48-53",2023,June
"S. Chen,T. Tomura,J. Hirokawa,K. Itou,M. Suga,Y. Shirato,D. Uchida,N. Kita","Design for operation in two frequency bands by division of the coupled region in a waveguide 2-plane coupler",,"IEICE Transactions on Electronics",,"vol. E105-C","no. 12","pp. 729-739",2022,Dec.
"Shihao Chen,Takashi Tomura,Jiro Hirokawa,Kota Ito,Mizuki Suga,Yushi Shirato,Daisei Uchida,Naoki Kita","Design to operate in Two Frequency Bands by Division of the Coupling Region in a Waveguide 2-plane Hybrid Coupler","Intl. Symp. Antennas Propag.",,,,,,2021,Jan.
"陳詩皓,戸村崇,廣川二郎,伊藤耕大,菅瑞紀,白戸裕史,内田大誠,北直樹","導波管2面ハイブリッド結合器の結合領域分割化による2周波数帯動作設計","信学通信大",,,,,,2020,Sept.
"Naoki KITA,Wataru YAMADA,Daisuke MORI,Makoto ANDO","DYNAMIC VARIATION MODEL OF DELAY PROFILES IN LINE-OF-SIGHT (LOS) INDOOR ENVIRONMENTS FOR BROADBAND TRANSMISSION","2005 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP2005)",,,"Vol. 3","No. FC3-1","pp. 1101-1104",2005,Aug.