Design and Analysis of Optimized Dimensional MIMO Antenna Using Quasi-Newton Algorithm

In this study, an optimization algorithm is used successfully for optimizing the geometric variables of the MIMO antenna to resonate in the UWB band. We proposed a novel design of a two-element MIMO antenna on a commercially available frame retardant-4 substrate. Initially, the antenna is operated in the multi-band, and this work aims to resonate with it in UWB. To solve the design task, a quasi-Newton (QN) optimizer of HFSS is used. It is an efficient algorithm in optimizing 2–3 variables at a time. Based on the parametric analysis, we have found that to achieve the impedance matching and resonating in notch bands, the rectangular opening slot in the ground structure plays a crucial role. The width and length of the rectangular opening slot have been optimized with the help of a QN optimizer. The antenna prototype has been fabricated based on the optimized results of the QN optimizer and tested to validate the simulation. The proposed model is resonating within the frequency ranges of a UWB, and the QN optimizer accomplished the task of converting a multi-band MIMO to UWB MIMO.