Dual-Frequency Ring Patch Antennas for GPS. - Shoichi Kumagai; Yasuhiro Kazama; Naohisa Goto (ISWCS, 2005)

Vertical polarization single-feed dual-frequency microstrip antenna with an arc-shaped slot. - Yasuhiro Kazama; Shoichi Kumagai; Takayasu Shiokawa (IEICE Electron. Express, 2005)