A 5.8 GHz ISM band Microstrip antenna for RFID applications

Radio Frequency Identification, RFID, as we know it, is a wireless technology used for identifying as well as tracking a tag attached to an object. In this paper, a Microstrip Antenna with a high Gain along with a good Return Loss (S11) and Impedance Bandwidth that will work for 5.8 GHz ISM band RFID applications, is proposed. The Antenna has been designed and simulated using Fire Resistant FR4 Epoxy substrate. The Patch dimensions are 96 x 156.5 x 1.5 mm(3) and has a Microstrip Line feed. The impedance bandwidth achieved by the final design is about 380 MHz in the 5.8 GHz ISM band and has an S11 of -31.42 dB. The Gain achieved by the final design of the antenna is 6.5 dB. As compared to the UHF band designs, the proposed design provides a better range coverage as well as better speed since the Gain is high. The designed antenna is mainly a broadside antenna and is designed with the help of Ansoft High Frequency Simulation Software (HFSS).