Frequency Reconfigurable Quad-Element MIMO Antenna with Improved Isolation for 5G Systems

Abstract

In this paper, a frequency reconfigurable multiband multiple-input-multiple-output (MIMO) antenna is developed for 5G communication systems. The presented MIMO antenna element consists of a 50 Ω microstrip line, a rectangular monopole divided into two patches, and a partial ground plane. A split-ring resonator (SRR) is introduced into the upper patch to cover multiple 5G application bands, and an RF PIN diode is embedded between the upper and lower patches to enable the frequency diversity feature. In order to design a MIMO antenna with improved inter-element isolation, four antenna elements are orthogonally located with ground planes connected to each other. The antenna design covers the n41/n46/n48/n79 5G application bands. The prototype MIMO antenna is developed on the FR-4 substrate, and the measured results match with the simulated outcomes. The overall footprint of the prototype antenna is 70 × 70 × 1.6 mm3.

Deep learning assisted fractal slotted substrate MIMO antenna with characteristic mode analysis (CMA) for Sub-6 GHz n78 5 G NR applications: design, optimization and experimental validation

“…In this circumstance, several design methodologies for MIMO antenna configurations have been adopted and implemented by the researchers for different wireless communication standards including 5G systems. The reported designs include arrangement of inverted-F MIMO antenna [1], FSS integrated 3-dimensional MIMO antenna incorporating folding technique and meandered DGS [2], hexagonal slot loaded MIMO antenna for 5NR mobile applications [3], metamaterial inspired textile MIMO radiator with high isolation [4], MIMO array antenna system with diamond ring slot elements for 5G smartphones [5], 2´1 MIMO array of folded patch with a shorting wall and 3D U-slot cut folded monopole feed [6], bow-tie dipole pair designed with trapezoidal and U-shaped slots in presence of an AMC reflector [7], Split ring resonator based MIMO antenna [8], complementary split ring resonator (CSRR) loaded MIMO radiator [9], MIMO antenna with hexagonal slot loaded patches and parasitic elements [10], eight port square-ring slot radiator MIMO array antenna [11], circle shaped MIMO radiator using DGS [12], MIMO array antenna [13], fractal MIMO antenna [14], 4-port quad element based MIMO antenna with suppression of multi-tone interference [15], flower shaped MIMO radiator using theory of characteristics mode analysis [16], eight element MIMO antenna based on stepped impedance resonators (SIRs) [17], half-circular U-shaped slots based MIMO antenna for wireless systems [18], 8 element MIMO antenna system consisting of monopole-type meandered branch and an inverted U-shaped self-isolated antenna branch [19], minkowski shape MIMO radiators [20,21], kotch fractal UWB MIMO [22], V-slotted FSS integrated MIMO antenna with quare spiral parasitic elements [23], CPW fed symmetrical patch based MIMO antenna with slits incorporated ground plane [24], MIMO antenna with arc shaped slots based patches with defected ground structures [25], dual-antenna system with a driven branch, parasitic ground branch, and neutralization line [26], and fractal MIMO radiator using curves related to Koch hybrid and minkowski [27]. In literature, the design proces...…”

Smart Antenna Optimization Techniques for Wireless Applications

“…A frequency reconfigurable multiband multiple-input-multiple-output (MIMO) antenna is developed for 5G communication systems [3]. A split-ring resonator (SRR) is introduced into the upper patch to cover multiple 5G application bands, and an RF PIN diode is embedded between the upper and lower patches to enable the frequency diversity feature.…”