1. [1] W. L. Stutzman, and G. A. Thiele: Antenna Theory and Design, 2nd ed., John Wiley & Sons, Inc., Hoboken, 1998, 56-68.
2. [2] H. Arai: Base Station Antennas Inside Tunnels and Subway Station, and Outdoor Compact Base Station Antennas for PDC System in Japan, IEEE Antennas Propag. Society Int. Symp., Orlando, 1999, 568-571.
3. [3] K. L. Lau, P. Li and K. M. Luk: A Monopolar Patch Antenna With Very Wide Impedance Bandwidth, IEEE Trans. Antennas Propag., 53:2 (2005), 655-661.
4. [4] D. W. Aten and R. L. Haupt: A Wideband, Low Profile, Shorted Top Hat Monocone antenna, IEEE Trans. Antennas Propag., 60:10 (2012), 4485-4491.
5. [5] M. Koohestani, J. -F. Zurcher, A. A. Moreira, and A. K. Skrivervik: A Novel, Low-Profile, Vertically-Polarized UWB Antenna for WBAN, IEEE Trans. Antennas Propag., 62:4 (2014), 888-1894.