Design and Optimization of Millimeter-Wave Microstrip-to-Waveguide Transition Operating over Broad Frequency Bandwidth. - Yusuke Deguchi; Kunio Sakakibara; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Trans. Electron., 2007)

Broadband Planar Antenna Combining Monopole Element with Electromagnetic Bandgap. - Kazuoki Matsugatani; Kunio Sakakibara; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Trans. Electron., 2008)

A consideration of electro-magnetic-resonant coupling mode in wireless power transmission. - Hiroshi Hirayama; Toshiyuki Ozawa; Yosuke Hiraiwa; Nobuyoshi Kikuma; Kunio Sakakibara (IEICE Electron. Express, 2009)

Microstrip patch array antenna coupled with parasitic patches using one dimensional EBG structures. - Kazuoki Matsugatani; Kunio Sakakibara; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Electron. Express, 2009)

A New Scheme to Avoid Null Zone for HF-Band RFID with Diversity Combining of Loop Antennas. - Hiroshi Hirayama; Nobuyoshi Kikuma; Kunio Sakakibara (IEICE Trans. Commun., 2010)

An Estimation Method of Poynting Vector with Near-Magnetic-Field Measurement. - Hiroshi Hirayama; Nobuyoshi Kikuma; Kunio Sakakibara (IEICE Trans. Electron., 2010)

Narrow-Wall-Slotted Hollow-Waveguide Array Antenna Using Partially Parallel Feeding System in Millimeter-Wave Band. - Yuki Ikeno; Kunio Sakakibara; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Trans. Commun., 2010)

Control of Power Dividing Ratio in Four-Way Power Divider for Feeding Microstrip Comb-Line Antenna. - Morihiko Nanjo; Kunio Sakakibara; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Trans. Commun., 2010)

Channel Capacity Improvement in Short-Range MIMO Using Side and Back Reflectors. - Hiroshi Hirayama; Gen Matsui; Nobuyoshi Kikuma; Kunio Sakakibara (IEICE Trans. Commun., 2011)

Broadband Millimeter-Wave Microstrip Comb-Line Antenna Using Corporate Feeding System with Center-Connecting. - Atsushi Kunita; Kunio Sakakibara; Kazuyuki Seo; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Trans. Commun., 2012)

Millimeter-Wave Microstrip-Line-Fed Broadband Waveguide Aperture Antennas. - Shintaro Yano; Kunio Sakakibara; Nobuyoshi Kikuma; Hiroshi Hirayama (IEICE Trans. Commun., 2012)

Automated Creation of Beamformer-Based Optimum DOA Estimation Algorithm Using Genetic Algorithm. - Shunsuke Yoshimura; Hiroshi Hirayama; Nobuyoshi Kikuma; Kunio Sakakibara (IEICE Trans. Commun., 2012)

An Investigation on Self-Resonant and Capacitor-Loaded Helical Antennas for Coupled-Resonant Wireless Power Transfer. - Hiroshi Hirayama; Tomohiro Amano; Nobuyoshi Kikuma; Kunio Sakakibara (IEICE Trans. Commun., 2013)

Review of Near-Field Wireless Power and Communication for Biomedical Applications. - Han-Joon Kim; Hiroshi Hirayama; Sanghoek Kim; Ki Jin Han; Rui Zhang 006; Ji-Woong Choi (IEEE Access, 2017)

Numerical integration based on hyperfunction theory. - Hidenori Ogata; Hiroshi Hirayama (J. Comput. Appl. Math., 2018)

Microstrip patch antenna with class-F load and DC block function for microwave power transfer. - Takase Oshima; Shunya Ban; Hiroshi Hirayama (IEICE Electron. Express, 2021)

RF-DC conversion circuit using quadrature hybrid for complex maximum power point tracking. - Kozaburo Tanahashi; Hiroshi Hirayama (IEICE Electron. Express, 2024)