Development of a Low-Profile MIMO Antenna with Mutual Coupling Reduction for 5G Millimeter-Wave Systems

Abstract

This research presents a compact Dual-Band (DB) Multiple-Input Output (MIMO) antenna characterized by extensive capacity and elevated isolations. The concept includes alterations to the ground planes. It employs Metamaterials (MM) to facilitate DB functionality in the Millimeter-Wave (MMW) space for 5G systems, notably in the 27/39 GHz bandwidths. The suggested antenna retains its DB functionality notwithstanding its modest dimensions of 3.6 × 3.5 × 0.76mm (without the feeding lines). The antenna is constructed on a Rogers RT5880 substrate, measuring 0.76 mm in width, with a relative permeability 2.1. The MIMO system consists of two symmetric radiating components in close range, yielding Mutual Coupling (MC) intensities of -22 dB and -14 dB at 27 and 39 GHz. Alterations to the ground width are implemented to improve isolation in the higher-frequency band, while the incorporation of MM significantly diminishes couplings in the lower-harmonic band. The integration of MM results in an increased capacity from 3.7 to 4.7 GHz in the shorter band (25-29.5 GHz) and 3.7 to 4.3 GHz in the upper band (37.7-41.9 GHz). The suggested system can function inside the 27/39 GHz bands with a compact layout, providing enough isolation, an envelope factor under 0.0002, and a notable diversity factor above 8.72 dB. These characteristics underscore the appropriateness of 5G MMW mobile connectivity