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This work involves two technics of MPA (Micro-strip Patch Antenna) radiation characteristics enhancement, firstly by the design of a 1*2 array antenna based on two slotted ones to enhance the gain and the directivity, secondly by the design of the same antenna with modified ground plan (DGS technic: Defected Ground structure). The 1*2 array antenna is feed by a 50-Ohm micro-strip line, set on an Epoxy FR-4 substrate, and designed to resonate at 2,45GHz frequency. Besides, simulation results of this array were performed by HFSS simulator and validated by CST, they were focused on adaptation characteristics (S11, VSWR and bandwidth) and far field radiation characteristics (Gain, Directivity and Radiation Pattern). The final proposed antenna can be used in narrowband indoor positioning application for RFID readers, using a fixedreader-scheme.

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