1. Planar antennas for wireless communications, Wiley, New York, 2003, ch. 7.
2. Electronic toll collection system, U.S. Patent No. 6509843 B1, 2003.
3. Compact and broadband microstrip antennas, Wiley, New York, 2002, ch. 5.
4. and A monopole-fed circularly polarized loop antenna, IEEE Antennas Propagat Soc Int Symp Dig, 1998, pp. 810-813.