A compact broadband and tri-band slot antenna is proposed. The antenna is composed of a L-shaped slot embedded in a ground plane, a T-shaped microstrip feed line and two rectangular slits etched in the ground plane. The L-shaped slot fed by the T-shaped microstrip line is introduce to generate broad impedance bandwidth, while the two slits are used to divide the one broad band into three frequency bands. The design step of the antenna is presented. Measured results show that the antenna is successfully designed to cover the frequency band from 1.71 to 2.9 GHz for 2G/3G/LTE systems, 3.3-3.8 GHz for WiMAX system and 5-6 GHz for WLAN system.

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