Electromagnetic characterization of diamond-shaped metamaterial structures using a 4×4 array at ultra-wideband frequencies Defrianto Defrianto ; Erwin Kurnia ; Saktioto Saktioto ; Tengku Emrinaldi ; Feby Nur Sakinah ; M Ikhsan ; Yan Soerbakti Komunikasi Fisika Indonesia 8 Sep 2026 10.31258/jkfi.22.3.213-220
