Wideband eight-element MIMO antenna with band-dispensation characteristics

Abstract

A compact eight-element MIMO antenna for wideband applications with dual-band sharply dispensation characteristics is presented. A same oriented two-element antenna is placed in orthogonal symmetric fashion on an octagon-shaped substrate cross-section area of 0.4374 λ02 (at 3.03 GHz), forms an eight-element MIMO antenna. A combination of stubs between same oriented elements and dual I-shaped stubs between a pair of corner elements are used to the interconnected ground for high isolation. The proposed MIMO antenna achieved a −10 dB measured fractional bandwidth (Sij ∈ i = j) of 133.98% (3.03–15.33 GHz) and obtained a minimum isolation value (Sij ∈ i ≠ j) of 15.5 dB. The dual quarter-wavelength slits are created in each radiator for dual notched-bands at 5.1–5.8 GHz and 6.7–7.3 GHz. The measured and simulated results are found in good agreement. © 2022