“…Because of the advantages of low cost, easy integration, easy fabrication and omnidirectional radiation pattern, the printed monopole antenna has drawn much attention, and many shapes have been reported, such as G shape [5], L shape [6], E shape [7], C shape [8], etc. In [9][10][11][12][13][14], dual-or tri-band antennas have been achieved. An effective way to obtain wideband or additional resonant frequency is to add parasitic element just as in [15,16].…”