An embedded UWB antenna and a portable device having the same are disclosed. The embedded UWB antenna comprises a grounding element; a T-shaped radiating element having a horizontal portion comprising at least an opening for cutting off undesired frequency and a vertical portion comprising a feed point for feeding current to resonate frequency; and a plurality of sleeve elements extended from the grounding element along two sides of the vertical portion; wherein the plurality of sleeve elements and the vertical portion are substantially parallel to each other.