Miniaturized six-ring elliptical monopole-based MIMO antenna for ultrawideband applications. - A. Amroun; Chemseddine Zebiri; Djamel Sayad; Issa T. E. Elfergani; Arpan Desai; Mohamed Lamine Bouknia; Rami Zegadi; Jonathan Rodriguez 001 (Int. J. Commun. Syst., 2023)