M icrostrip antenna had several advantages such as unified form, small dimension, easy to be realized , easy to be connected and easy to be integrated with other electronic devices. This advantages that was made use of by several applications, like telemetry, the radar, biomedical, scanning, mobile radio, the satellite communications, and remote sensing In the final project has been designed and realized a microstrip antenna with circular polarization applied in Radio Frequency Identification ( RFID ) antenna to work at a frequency of 0.92 GHz in accordance with the permission of the Director General of Post and Telecommunication. Bowtie patch antenna had been simulating and manufacturing realization. The feeding antenna using rationing triplicate ( three ration ). Substrate material used is FR4 ( eproxy ) By simulation, reeSss achieved below -23,06 dB and VSWR 1,155 at the center of frequency (0,924 GHz). Therefore, these antenna have been fulfill the requirement performance.