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)