"Jiro Hirokawa,Shihao Chen,Takashi Tomura","Bandwidth enhancement by optimizing the cross�]sectional shape of the coupling region in a waveguide 2�]plane hybrid","ICEAA",,,,,,2021,Oct.
"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.