In this paper, the authors present multi-band double inverted L-slot patch antenna for wireless applications. This antenna structure is built by cutting double inverted L-slots in the patch. This structure has the following advantages: the feed is coaxial probe, the antenna has single-layer, the structure of the antenna is simple and the antenna is inexpensive. Five resonating modes are excited when doubled inverted L-slots are cut on patch with achievement of 4dBi gain. The surface current distribution of this antenna alters radiating fields and achieves wideband of 1.2GHz within range of 15.3-16.5GHz.