A 20-GHz-Band 64 × 64 Hollow Waveguide Two-Dimensional Butler Matrix. - Takashi Tomura; Dong-Hun Kim; Masahiro Wakasa; Yuki Sunaguchi; Jiro Hirokawa; Kentaro Nishimori (IEEE Access, 2019)

Control of Radiation Direction in an Aperture Array Excited by a Waveguide 2-Plane Hybrid Coupler. - Yuki Sunaguchi; Takashi Tomura; Jiro Hirokawa (IEICE Trans. Commun., 2022)