A small wideband patch antenna with a modified half U-slot is presented. The antenna has an impedance bandwidth of 40% , which is from 1.72 to 2.58 GHz. The antenna size is electrically and physically small, which is and 240 mm, respectively. The proposed small antenna has good radiation characteristics, with a peak gain of 2 dBi. The proposed antenna is suitable for small wireless devices with the applications of Wi-Fi, Bluetooth, UMTS, GSM 1800, PCS 1900, and LTE.