RF energy harvesting is one type of energy harvesting that can be potentially harvested such as solar, vibration and wind. The RF energy harvesting uses the idea of capturing transmitted RF energy at ambient and either using it directly to power a low power circuit or storing it for later use. The concept needs an efficient antenna along with a circuit capable of converting RF signals to DC voltage. The efficiency of an antenna mainly depends on its impedance and the impedance of the energy con- verting circuit. If the two impedances aren’t matched then it will be unable to receive all the available power from the free space at the desired frequency band. Match- ing of the impedances means that the impedance of the antenna is the complex conjugate of the impedance of the circuit