Optimal Tracking for MIMO Systems via Data Based System Representation. - Takafumi Kai; Yasumasa Fujisaki (CDC/ECC, 2005)

Feed through an Aperture to a Post-Wall Waveguide with Step Structure. - Takafumi Kai; Jiro Hirokawa; Makoto Ando (IEICE Trans. Commun., 2005)

A Coaxial Line to Post-Wall Waveguide Transition for a Cost-Effective Transformer between a RF-Device and a Planar Slot-Array Antenna in 60-GHz Band. - Takafumi Kai; Yusuke Katou; Jiro Hirokawa; Makoto Ando; Hiroshi Nakano; Yasutake Hirachi (IEICE Trans. Commun., 2006)

Moment Method Analysis of a Plane Wave Generator in an Oversized Rectangular Waveguide. - Takafumi Kai; Jiro Hirokawa; Makoto Ando (IEICE Trans. Commun., 2007)

A Cost-Effective Transition between a Microstrip Line and a Post-Wall Waveguide Using a Laminated LTCC Substrate in 60-GHz Band. - Takafumi Kai; Jiro Hirokawa; Makoto Ando; Hiroshi Nakano; Yasutake Hirachi (IEICE Trans. Electron., 2007)