"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.