IoT is seen as the development of internet network connectivity in electronic devices such as smartphones or other devices that can communicate and connect to each other so that they can be monitored and even remotely controlled. The concept of IoT is considered to be the most identical to the concept of a smart home so that it requires greater and more flexible energy. Harvesting energy from the surrounding environment such as electromagnetic radio waves are considered as an alternative that needs to be considered through the rectenna system. The main components used in the energy harvesting of electromagnetic waves are antenna, matching network, and rectifier circuit. Antennas used as an important role in RF energy harvesting because they must meet certain requirements such as high gain and wide bandwidth. In this paper, a quad-band antenna is proposed to meet the needs of antenna rectifiers that will work in a range of 3-10 GHz. The antenna design using a double-crossed bowtie model printed on the FR-4 substrate. Simulation and optimization are performed to obtain good bandwidth and gain characteristics. The simulation results show that the antenna can work at frequencies of 5.984 GHz, 7.414 GHz, 9.108 GHz, and 10.208 GHz. With the largest bandwidth and gain that can be obtained at 727.7 MHz and 3.654 dB, respectively. © 2019 IEEE.