Antennas plays a vital role in wireless communications. The Internet of things (IoT) refers to the Internet connectivity among computers, mobile devices and sensors. These devices can able to communicate and interact with each others over the Internet, and they can also be remotely monitored and controlled.[1] Most of the IoT applications function in the unlicensed ISM (The Industrial, Scientific, and Medical radio) bands of 2.4GHz, Wireless connectivity for IoT devices can be done using Bluetooth, Zigbee, Wi-Fi which can utilize the frequency zone of ISM band . The Institute of Electrical and Electronics Engineers agreed that 2.4 GHz, with its wide channel selection and range/penetration/cost potential, was a safer bet. Today, some Wireless N routers can operate on both 2.4 GHz and 5 GHz bands concurrently.[6] The 2.4 GHz ISM band is a commonly accepted band for worldwide operations. MW ovens, cord-less phones, medical machines, military RADARS and industrial heaters are uses this ISM band which is also be called unlicensed bands.[2] In this paper we are using L -shaped patch The finalized antenna operates at 2.4 GHz with a 96% radiation efficiency and peak gains of 2.35 dBi .The performance of the simulation and measurement are found to be in good agreement. Based on the performance that was achieved, the developed L-shaped antenna can be used in a variety of 2.4 GHz ISM bands and IoT application environments, especially for indoor localization estimation scenarios, such as smart offices and houses, and fourth-generation (4G) wireless communications applications due to its small size and high fractional bandwidth.