## 1 Introduction
Higher coupling between antennas may be achieved by using metamaterial structures, which concentrate electromagnetic fields and currents around antenna structures rather than distributing them over the antenna ground. Antenna and passive circuit applications may benefit from metamaterial technology's ability to shrink circuit size while maintaining or improving performance. Due to this, the circuit size does not change with the operating frequency. Hence it may be drastically shrunk to fit in a little space. Due to the negative permeability feature of an interdigital split ring resonator, a MIMO antenna with increased isolation for the Long-Term Evolution (LTE) frequency range has been developed using SRR [12]. The article proposes an integrated massive MIMO antenna system loaded with metamaterial for fifth-generation (5G) applications. The metamaterial approach aids in realizing DNG characteristics via the use of a complementary SRR (CSRR) structure, a wide epsilon negative metamaterial with near-zero refractive index properties, and more than 1 GHz bandwidth [13]. The metamaterial is printed on top of dielectric resonators to increase isolation, which moves the most vital coupling forces away. Field distributions are altered as the metamaterial structure interacts with the EM fields, resulting in decreased linked areas. The suggested antenna construction is simple and compact [14]. A compact broadband planar monopole MIMO antenna is used for long-term advanced evolution. Using two innovative broadband metamaterial split-ring resonator units, the mutual coupling of the MIMO antenna is lowered, while the antenna's impedance bandwidth is increased [15]. Effective efficiency at mm wavelengths requires substantial suppression of the substrate modes. These modes may be attenuated in several ways, including keeping the substrate at a constant thickness, keeping the element spacing in arrays at a constant value of k0, and employing the substrate-based waveguide approach. It grounds the surface modes using metallic vias [16]. A band-notched characteristic with wideband omnidirectional dielectric resonator antenna (DRA) is used to generate an omnidirectional radiation pattern, and different modes of a rectangular DR are activated using a laminated feed structure [17]. The 5G communication can be implemented with an antenna designed with metamaterials for a 28 GHz frequency band [18]. Over the last several years, there has been a lot of focus on improving the isolation between many antennas in compact terminals. Isolation is an important parameter of the MIMO antenna, and high isolation is required between the ports. The high isolation can be achieved with a metamaterial-inspired MIMO antenna design [19]. The use of decoupling structures in space and linking decoupling networks to the feeding ports of antennas. A line that has been neutralized, defective ground constructions, electromagnetic band gaps, and other decoupling structures in space are intended to affect antennas' emf fields or ionic currents. Distributed, lumped, and resonator networks are examples of decoupling networks that separate ports by modifying feeding signals [20; 21]. The oval MIMO antenna has a circular radiator and two parallel protruding stubs with open ends; the concentric rings include oval slots (CROS). Circularly polarized (CP) radiation is generated by strategically placing three oval slots in the concentric rings, two of which are exposed to the outside [22]. The monopole antenna's radiating element has been loaded with numerous narrow slots and multiple slotted stubs to produce multi-band characteristics (MSS) [23]. The stepped DR enhances isolation in the higher frequency range, while a modified neutralization line realized using a quarter wavelength square patch accomplishes the same goal in the lower frequency range. The gain and radiation properties of the stepped DR and the artificial magnetic conductors (AMC) reflector are enhanced by their broadside radiating modes and dual artificial magnetic conductors and PEC bands, respectively [24].