A Small Broadband Omni-Directional Printed Antenna Comprising Symmetrically Arranged Trapezoid Elements. - Makoto Sumi; Keizo Cho (IEICE Trans. Commun., 2011)

Operating Mechanism of Small Quad-Band Printed Antenna Comprising Symmetrically Arranged Trapezoidal Elements and Rectangle Strip Elements. - Makoto Sumi; Keizo Cho (IEICE Trans. Commun., 2014)

Dual-Band Dual-Rectangular-Loop Circular Polarization Antenna for Global Navigation Satellite System. - Makoto Sumi; Jun-ichi Takada (IEICE Trans. Commun., 2019)