A 2 \(\times \) 2 Microstrip Patch MIMO Array for IoT Applications

This study present an antenna design with multiple microstrip patches that can be applied in multiple-input-multiple-output (MIMO) systems. The proposed array occupies four elements organized in a 2 \(\times \) 2 configuration as the radiators. By generating orthogonal operating modes, the strong mutual coupling effect between the elements can significantly reduced. The simulated data indicates that the proposed MIMO array produces a good impedance matching at 4.8 GHz, and the coupling between each pair of radiators are lower than −15 dB. Besides, the distances between the edge of each element towards the E- and H-plane are 0.032 \(\lambda \) and 0.026 \(\lambda \) , respectively. The suggested configuration could be a promising option for 5G Internet of Things (IoT) devices thanks to its low-complexity decoupling design. Moreover, it has a potential for expansion into a large-scale array with 2 \(\times \) N elements.