In this paper, analysis and design of compact microstrip slot antenna is proposed for RFID/WLAN applications. Antenna is designed using FR4 substrate with overall dimension of 20x15mm2 and dielectric constant of 4.4. The proposed antenna has resonant frequency of 5.8GHz. The fundamental parameters of the antenna such as bandwidth (19.13%), return loss (>10dB), gain (3.3dBi), radiation pattern and polarization are obtained. All meets the reasonable antenna standards. Simulation tool, based on the MOM (Method Of Moment-ZELAND IE3D version 15.10) has been used to analyze and optimize the proposed antenna.