Isolation Enhancement in Polyimide-Based MIMO Antennas Using Slot-Based Metamaterial Defected Ground Structures and a Stub-Loaded Decoupling Network. - Al-Gburi, Ahmed J. A.; Prasad, Kudumu V.; Devana, Venkata N. K. R.; Rao, Ghali S.; Armghan, Ammar; Kassim, Anuar M. (Progress in Electromagnetics Research M, 2026)