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The popularity of the coplanar waveguide (CPW) has increased significantly. The main advantage of the CPW is easier integration with solid state active devices. Many studies have been made on the antenna such as patch antennas, loop antennas and slot antennas. In this paper, we investigate a linear array of a circularly polarized slot loop antenna fed by CPW by using the FDTD method. The advantages of this antenna are simple structure and an easily formed array without a complex feed line.