In this paper, we present a compact high-efficiency multi-band micro strip antenna for the mobile devices. At the same time, because most of antennas are located near the ground planar, the proposed antenna is designed with a ground planar. The antenna occupies a small size of 100*60mm2 and operates in CDMA(824-894MHz),GSM(880-960MHz), DCS(1710-1880),PCS(1850-1990),UMTS(1920-2170) and 3G band. By using a long slot, two trapezoid slots and a short slot, a triple resonance around 900MHz and another wideband resonance around 2100MHz can be created, respectively. Details of the antenna design are described , and its radiation performances results are presented and discussed. Keywords-Multi-band antenna;; mobile communication devices; hige-efficency
