The paper focuses on the designing of dual-band microstrip rectenna with the purpose of harvesting RF energy for the Wi-Fi frequency range. Rectenna can convert the RF energy present in the environment into direct current (DC) which is used to power various low energy-consuming devices. The proposed rectenna is supposed to be used as an alternate to conventional energy source for low power devices involved in IoT systems. The microstrip rectenna resonates at 900 MHz frequency and 2.45 GHz frequency which are the operating frequency of Wi-Fi HaLow technology and conventional Wi-Fi technology which is advantageous for IoT applications. Air is used as a substrate with dielectric permittivity of 1.0 for the development of antenna. The design and simulation of the antenna were conducted using Computer Simulation Technology (CST) Studio Suite The rectifier circuit employed in this study utilized an HSMS-285C Schottky diode in conjunction with a Greinacher voltage doubler circuit. Advanced Design System (ADS) was used for the simulation purpose of rectifier. The antenna operates at 900 MHz with gain of 8.84 dB and at 2.45 GHz with the gain of 8.82 dB and S11 below −10 dB. The proposed rectifier achieves peak output voltage of 3.269 V with a conversion efficiency of 71.235% for 900 MHz and maximum output of 3.142 V that has conversion efficiency of 65.801% for 2.45 GHz which can be used for powering low power IoT devices operating on Wi-Fi HaLow as well as conventional Wi-Fi.