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The electronic toll collection system is an important part of the intelligent transportation system. The microstrip antenna is the bridge between the OBU and RSU when they exchange information. This paper introduces the microstrip antenna’s theory and simulation. The microstrip antenna’s structure is simple and its operation band is in the 5.8GHz. Its VSWR is less than 1.5 and the gain can reach 3.4dB. It makes the information exchanging between the OBU and RSU more accurate and morerapid Keywords-ETC ; Intelligent transportation ; Microstrip antenna ;OBU

Design of 5.83GHz Microstrip Antenna Used in the OBU