Wireless-power transmitter with distance sensor for ultra-small wearable devices. - Takeshi Nishihashi; Hisashi Nishikawa; Norifumi Kashiyama; Ami Tanaka; Takakuni Douseki (IEEE SENSORS, 2017)

Batteryless Speed and Timestamp Recorder with Multi-channel FM Radio Featuring Bicycle Frame Antenna. - Shogo Umemoto; Norifumi Kashiyama; Hisashi Nishikawa; Ami Tanaka; Takakuni Douseki (ICUFN, 2019)

An RF Distance Sensor Utilizing Harmonic Signal from Rectenna for Power-Controlled Wireless Power Transmission System to Wearable Devices. - Norifumi Kashiyama; Kosuke Yoshida; Hisashi Nishikawa; Ami Tanaka; Takakuni Douseki (ICCE, 2020)