RF energy harvesting requires capturing free flow of energy at the frequencies of interest and converting that energy into usable DC voltage. Ambient RF energy is captured by the use of an antenna and channeled into the input of RF-DC conversion module (a voltage multiplier circuit) through an appropriate matching network. Electromagnetic energy harvesting holds a promising future for energizing low power devices in wireless communication circuits. Here, the authors present a RF energy harvesting system that can harvest energy from the ambient surroundings from the radio frequency of 1.42 GHZ to 2.28 GHZ. The harvesting system is aimed to provide an alternative source for generating electricity. The system design consists of a high gain square shaped patch antenna, a RF-DC conversion module and a battery.