Annually 14.7% demand is increasing for IoT devices & Wireless technologies projecting a rise in market to $22.3 billion till 2030, thus efficient and compact antennas operating at Industrial Scientific and medical [ISM] Band are widely needed. Wireless  technologies like Wi-Fi, Zigbee, and Bluetooth uses 2.4GHz ISM band. Microstrip patch antennas are most oftenly used in these technologies, Microstrip patch antennas have characteristics like simple structure, low profile and easy to integrate with microwave circuitry. Yet, conventional microstrip antennas have low bandwidth and comparatively less radiation efficiency. This research work present the analysis and design of Circular Slot-Loaded square ring microstrip patch antenna functioning at 2.4GHz. The designing of the antenna is made by FR-4 dielectric substrate and examined using ANSYS HFSS electromagnetic simulation software. The current distribution is modified by introducing a circular slot in square ring patch resulting in improved impedance matching. The simulation result signify a VSWR of 1.3, gain of 3 dB, return loss of -32.8dB and bandwidth ranging from 2.3GHz to 2.6GHz. The proposed antenna have a compact design while delivering improved performance making it right for IoT devices.