Design and Development of Quad Port MIMO Antenna with Metamaterial for C, X, Ku, K, Ka Bands and 6G Applications

A four elements MIMO (Multiple Input Multiple Output) antenna with improved isolation and compact size of 32 × 32 × 0.8 mm³ is proposed for C, X, Ku, K & Ka bands applications. This antenna also covering a band proposed for 6G communication (7–20 GHz). Initially, a ring-shaped elemental monopole patch antenna integrated with four perpendicular spaced spoke and staircase shaped DGS below fed line has been proposed. The elemental antenna shows a better reflection coefficient, good gain and directional radiation pattern at different frequency like X band (8–12 GHz), Ku band (12–18 GHz), K band (18–26.5 GHz) and Ka band (26.5–40 GHz) operating from 5.8 to 40 GHz with bandwidth of 34.2 GHz. To utilize the proposed antenna in multipath propagation environment MIMO configuration has been opted. Initially, a two-element based MIMO is investigated, finally the four element MIMO with a meshed metamaterial in ground to mitigate the problem of interferences among different elements of antenna has been done. Due to MIMO an improvement in bandwidth from 3.2–45 GHz is also observed covering C band (4–8 GHz). The proposed MIMO have an improved ECC, DG, TARC, Peak Gain and Group delay. Impedance circuit with passive elements is also observed using ADS software.