Attenuation Poles by Tap-Feed in Mobile Communication Filters for Intelligent Simulation and Design. - Junya Ishii; Kazuhito Murakami; Yasumasa Noguchi; Kouji Wada (EUROSIM, 1995)

New tap-coupling technique for improving skirt characteristics of a λ/4 resonator bandpass filter by placement of attenuation poles. - Kouji Wada; Yoshiyuki Aihara; Kouichi Nakagawa; Osamu Hashimoto (APCCAS (1), 2002)

An Empirical Study of a Coplanar Bandpass Filter with Attenuation Poles Using Short-Ended Half-Wavelength Resonators. - Kouji Wada; Yoshiyuki Aihara; Osamu Hashimoto; Hiroshi Harada (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Realization of Attenuation Poles, Spurious Resonance Suppression and Size Reduction by Microstrip SIR Loaded with Dielectric Rods. - Ramesh K. Pokharel; Kouji Wada; Osamu Hashimoto; Takeshi Takahashi (IEICE Trans. Electron., 2005)

Out-of-Band Improvement by Microstrip Line BPFs with Multiple Attenuation Poles in Stopband Using Various Conditions of Coupling Length of Partially Coupled-Line Section. - Kouji Wada; Ramesh K. Pokharel; Takanobu Ohno; Osamu Hashimoto (IEICE Trans. Electron., 2005)

Bandpass Filters Using Tunable Half-Wavelength Resonators with Transmission Zeros. - Kouji Wada; Shinya Watanabe; Ryosuke Suga; Osamu Hashimoto (IEICE Trans. Electron., 2005)

A Dual-Band Comb-Line Filter Using a Half-Wavelength Stripline Nesting a Quarter-Wavelength Coplanar Waveguide Resonator. - Shoichi Kitazawa; Masahiro Geshiro; Kenta Ishimaru; Masaharu Ohashi; Hideaki Fujimoto; Kouji Wada (IEICE Trans. Commun., 2007)