Abstract
In this study, we proposed an indoor broadband dual-polarized 2 × 2 MIMO (multiple-input and multiple-output) antenna having dimensions of 240 mm × 200 mm × 40 mm, for application in 5G wireless communication systems. The proposed antenna comprised two vertically polarized circular monopole antennas (CMAs), two horizontally polarized modified rectangular dipole antennas (MRDAs), and a ground plane. The distance between the two MRDAs (MRDA1 and MRDA2) was 70.5 mm and 109.5 mm in the horizontal (x-direction) and 109.5 mm vertical (y-direction) directions, respectively. Conversely, the distance between the two CMAs (CMA1 and CMA2) was 109.5 mm and 70.5 mm in the horizontal (x-direction) and vertical (y-direction) directions, respectively. While the CMAs achieved broadband characteristics owing to the optimal gap between the dielectric and the driven radiator using a parasitic element, the MRDAs achieved broadband owing to the optimal distance between the dipole antennas. The observations in this experiment confirmed that the proposed could operate in the 5G NR n46 (5.15–5.925 GHz), n47 (5.855–5.925 GHz), n77 (3.3–4.2 GHz), n78 (3.3–3.8 GHz), and the n79 (4.4–5 GHz) bands. Moreover, it exhibited a wide impedance bandwidth (dB magnitude of S11) of 101% in the 2.3–7 GHz frequency range, high isolation (dB magnitude of S21), low envelope coefficient correlation (ECC), gain of over 5 dB, and average radiation efficiency of 87.19%, which verified its suitability for application in sub-6 GHz 5G wireless communication systems.
Highlights
Mid-band 5G, called the mid sub-6 GHz band, is gaining widespread attention owing to the intensive usage by general 5G subscribers
We propose a simple broadband monopole antenna with a parasitic element and dipole antenna composing a dual-polarized 2 × 2 multi-input multi-output (MIMO) antenna
We proposed a broadband dual-polarized 2 × 2 MIMO antenna for application in 5G wireless communication systems, comprising two vertically polarized circular monopole antennas, two horizontally polarized modified rectangular dipole antennas, and a ground plane
Summary
Mid-band 5G, called the mid sub-6 GHz band, is gaining widespread attention owing to the intensive usage by general 5G subscribers. In study [11], a common radiator coplanar waveguide (CPW) fed a four port multiple-input-multipleoutput (MIMO) antenna for 5G sub-1 GHz, sub-6 GHz and Wi-Fi 6 applications with a shared radiator is proposed This antenna has relatively bad impedance bandwidth (−6 dB). The study [12] proposed a wideband compact Yagi-like directional MIMO antenna with a shared radiator It has insufficient impedance bandwidth of 28%. We propose a simple broadband monopole antenna with a parasitic element and dipole antenna composing a dual-polarized 2 × 2 multi-input multi-output (MIMO) antenna. This MIMO antenna comprises two circular monopole antennas (CMAs) and two modified rectangular dipole antennas (MRDAs) in different biased directions for dual polarization in indoor 5G wireless communication systems. The proposed MIMO antenna exhibited a wide impedance bandwidth (dB magnitude of S11), high isolation (dB magnitude of S21), and low envelope correlation coefficient
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