Design and Simulation of two elements rectangular Microstrip Patch Antenna at 5.8 GHz for RFID Reader Applications with high Directivity and Gain

In this paper, detailed design of a 5.8 GHz two elements rectangular Microstrip Patch Antenna for use in the RFID Reader applications is presented. The patch antenna was designed using RT/duroid-5880 material, with a loss tangent tanδ = 9.10
^-4
, dielectric constant of 2.2 and thickness of 1.56mm, fed by a 50- microstrip line. In the beginning, we defined our antenna as a single patch of a rectangular shape but after evaluating the antenna characteristics results such as gain, directivity and radiation patterns, we transformed it to a 2*1 linear array antennas. The main aim is to improve directivity, gain and radiation patterns.