Compact wideband rat-race hybrid utilizing composite right/left-handed transmission lines. - Yuma Sumitomo; Tadashi Kawai; Akira Enokihara; Isao Ohta; Kei Satoh; Yasunori Suzuki; Hiroshi Okazaki; Shoichi Narahashi (RWS, 2013)

Parallel Ring-Line Rat-Race Circuit with Very Loose Coupling Utilizing Composite Right-/Left-Handed Transmission Lines. - Tadashi Kawai; Yuma Sumitomo; Akira Enokihara; Isao Ohta; Kei Satoh; Yasunori Suzuki; Hiroshi Okazaki; Shoichi Narahashi (IEICE Trans. Electron., 2014)