Broadband Multi-Way Microstrip Power Dividers. - Mitsuyoshi Kishihara; Kuniyoshi Yamane; Isao Ohta; Tadashi Kawai (IEICE Trans. Electron., 2005)

Design of Quadrature Hybrids and Directional Couplers Based on the Equivalent Admittance Approach. - Isao Ohta; Tadashi Kawai (IEICE Trans. Electron., 2005)

Miniature Broad-Band CPW 3-dB Branch-Line Couplers in Slow-Wave Structure. - Takao Fujii; Isao Ohta; Tadashi Kawai; Yoshihiro Kokubo (IEICE Trans. Electron., 2007)

Economic Setup for a Dual-Band Metallic Waveguide with Dual In-Line Dielectric Rods. - Yoshihiro Kokubo; Sotaro Yoshida; Tadashi Kawai (IEICE Trans. Electron., 2007)

Parallel Coupled Microstrip Couplers Compensated with Periodic Floating-Conductors on Coupled Edges. - Takao Fujii; Isao Ohta; Tadashi Kawai; Yoshihiro Kokubo (IEICE Trans. Electron., 2008)

Dual-Band Wilkinson Power Dividers Using a Series RLC Circuit. - Tadashi Kawai; Yasuaki Nakashima; Yoshihiro Kokubo; Isao Ohta (IEICE Trans. Electron., 2008)

Wide Band Metallic Waveguide with Asymmetric In-Line Dielectric Rods. - Yoshihiro Kokubo; Tadashi Kawai (IEICE Trans. Electron., 2008)

Fabrication of Wide Band Metallic Bend Waveguide with Asymmetric In-Line Dielectric Rods. - Yoshihiro Kokubo; Tadashi Kawai (IEICE Trans. Electron., 2009)

Band-Broadening Design Technique of CRLH-TLs Dual-Band Branch-Line Couplers Using CRLH-TLs Matching Networks. - Tadashi Kawai; Miku Nakamura; Isao Ohta; Akira Enokihara (IEICE Trans. Electron., 2010)

Design of an H-Plane Waveguide Intersection with High Isolation. - Hiroaki Ikeuchi; Tadashi Kawai; Mitsuyoshi Kishihara; Isao Ohta (IEICE Trans. Electron., 2011)

Investigation of Heating Effect by Microwave Irradiation for Phantoms and Plants. - Jingfan Xu; Tadashi Kawai; Akira Enokihara; Hiroshi Murakami (ICETET, 2012)

Design and Fabrication of PTFE-Filled Waveguide Components by SR Direct Etching. - Mitsuyoshi Kishihara; Hiroaki Ikeuchi; Yuichi Utsumi; Tadashi Kawai; Isao Ohta (IEICE Trans. Electron., 2012)

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)

Design methods for broadband 3dB branch-line and rat-race hybrids. - Tadashi Kawai; Isao Ohta; Akira Enokihara (IEICE Electron. Express, 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)

Low Chirp Modulation by Electro-Optic Intensity Modulator Using Microwave 180-Degree Hybrid Directly Formed on LiNbO3 Substrate. - Akira Enokihara; Masashi Yamamoto; Tadashi Kawai; Tetsuya Kawanishi (IEICE Trans. Electron., 2015)

Compact Electro-Optic Single Sideband Modulators Utilizing Miniaturized Branch-Line Couplers on LiNbO3 Substrate. - Katsuyuki Yamamoto; Tadashi Kawai; Akira Enokihara; Tetsuya Kawanishi (IEICE Trans. Electron., 2015)

Design of Multi-Way LC-Ladder Dividers with Multi-Band Operation. - Yosuke Okada; Tadashi Kawai; Akira Enokihara (IEICE Trans. Electron., 2017)

A 920MHz Lumped-Element Wilkinson Power Divider Utilizing LC-Ladder Circuits. - Tadashi Kawai; Kensuke Nagano; Akira Enokihara (IEICE Trans. Electron., 2018)

Dual-Parallel Mach-Zehnder Modulator Integrated with 180-degree Hybrid for Compensation of Third-Order Intermodulation Distortion. - Daichi Furubayashi; Yuta Kashiwagi; Tadashi Kawai; Akira Enokihara; Naokatsu Yamamoto; Tetsuya Kawanishi (OECC/PSC, 2019)

Electro-Optic Modulator for Compensation of Third-Order Intermodulation Distortion Using Frequency Chirp Modulation. - Daichi Furubayashi; Yuta Kashiwagi; Takanori Sato; Tadashi Kawai; Akira Enokihara; Naokatsu Yamamoto; Tetsuya Kawanishi (IEICE Trans. Electron., 2020)

Mach-Zehnder Optical Modulator Integrated with Tunable Multimode Interference Coupler of Ti:LiNbO3 Waveguides for Controlling Modulation Extinction Ratio. - Anna Hirai; Yuichi Matsumoto; Takanori Sato; Tadashi Kawai; Akira Enokihara; Shinya Nakajima; Atsushi Kanno; Naokatsu Yamamoto (IEICE Trans. Electron., 2022)

Optical Mode Multiplexer Using LiNbO3 Asymmetric Directional Coupler Enabling Voltage Control for Phase-Matching Condition. - Shotaro Yasumori; Seiya Morikawa; Takanori Sato; Tadashi Kawai; Akira Enokihara; Shinya Nakajima; Kouichi Akahane (IEICE Trans. Electron., 2024)