Six-port based wave-correlator with application to beam direction finding. - Toshiyuki Yakabe; Fengchao Xiao; Kenji Iwamoto; Fadhel M. Ghannouchi; Kohei Fujii; Hatsuo Yabe (IEEE Trans. Instrum. Meas., 2001)

Application of a six-port wave-correlator for a very low velocity measurement using the Doppler effect. - Fengchao Xiao; Fadhel M. Ghannouchi; Toshiyuki Yakabe (IEEE Trans. Instrum. Meas., 2003)

A Vector Network Analyzer Based on Seven-Port Wave-Correlator. - Toshiyuki Yakabe; Fengchao Xiao (IEICE Trans. Electron., 2005)

Six-port type reflectometer based on reflection measurement system using a standing wave detector in the V-band. - Kohei Fujiwara; Tokita Kouichi; Toshiyuki Yakabe (IEICE Electron. Express, 2021)