Abstract
Recently, ferrite materials with outstanding characteristics, like reflection and absorption ability, lightweight, and thinness in size, are essential to resolve electromagnetic interference challenges. In the present work, Terbium doped Nickel-Zink nano-ferrite material with a composition of Ni0.5Zn0.5Tb0.02Fe1.98O4 was prepared and used as a substrate in a dual-band yagi-Uda-shaped 4×4 multi input multi output antenna. X-ray diffraction (XRD) measurements confirmed the cubic spinel ferrite sample. A vibrating sample magnetometer and Field Emission Scanning Electron Microscope analysis are also performed to evaluate its magnetic and morphological properties. Dielectric constant (εr) and permeability (μr) are determined using a vector network analyzer. The Multi Input Multi Output (MIMO) antenna operates in dual frequency bands of 3.5 and 5.8 GHz, which is suitable for fifth-generation smartphone applications. The performance of a yagi-Uda-shaped 4×4 MIMO antenna with terbium-doped Nickel-Zink ferrite used as a substrate is explored regarding return loss, radiation efficiency, bandwidth, gain, inter-terminal isolation, envelope correlation coefficient, and Channel Capacity Loss. It is found that the size of the MIMO antenna is reduced with improved bandwidth, isolation, and Channel Capacity Loss performance using a nano-ferrite substrate as compared to those conventional Flame retardant (FR4) substrates.
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