This study introduces a 3x3 microstrip patch antenna array integrated with a Defected Ground Structure (DGS), designed to meet the escalating demands of Internet of Things (IoT) communication networks. In this paper an antenna array designed for dual-band operation at 1.8 GHz and 2.4 GHz—frequencies important to IoT applications. The antenna's S-parameter values exhibit exceptional performance, with return losses significantly surpassing the -10 dB benchmark, ensuring minimal signal reflection and robust transmission capabilities. Notably, the antenna achieves a substantial gain of 4.9573 dBi at 2.4 GHz and 1.9698 dBi at 1.8 GHz, with VSWR readings well below the ideal threshold of 2, denoting a well-tuned antenna system. The 3D radiation pattern assessments confirm the array's efficacy in radiating uniformly across operational bands. The paper explores the set of optimized design parameters, supporting the antenna’s superior performance. The proposed design shows the balances compactness, efficiency, and bandwidth, which is crucial for the IoT devices.