1. and The COTA UWB magnetic slot antenna, Proc IEEE AP-S Int Symp 2001, Boston, MA pp. 104-107.
2. See http://www.ty-top.com/news/pdf/2003_03_10e.pdf.
3. and Design of a wideband planar volcano-smoke slot antenna (PVSA) for wireless applications, Proc IEEE AP-S Int Symp, 2003, Columbus, OH pp. 655-658.