The design of Radio Frequency (RF) energy harvesting by using circular planar spiral inductor antenna arrays is proposed. The proposed antenna is a 2x1 circular spiral inductor. The size, return loss and radiation patterns were studied. It is expected that the proposed method is capable of harvesting RF electromagnetic energy more efficiently compared to when using single element spiral antenna. Both circular spiral inductors are fabricated on Roger 4003 substrates. Simulation results show that 5.14dBi gain for antenna array and 3.22dBi gain for single antenna can be achieved at frequency 527MHz.