Abstract
This paper presents a dual-band four-element multiple-input-multiple-output (MIMO) array for the fifth generation (5G) mobile communication. The proposed antenna is composed of an open-loop ring resonator feeding element and a T-shaped radiating element. The utilization of the open-loop ring resonator not only reduces the size of the antenna element, but also provides positive cross-coupling. The dimension of a single antenna element is 14.9 mm × 7 mm (0.27λ × 0.13λ, where λ is the wavelength of 5.5 GHz). The MIMO antenna exhibits a dual-band feature from 3.3 to 3.84 GHz and 4.61 to 5.91 GHz, which can cover 5G New Radio N78 (3.3–3.8 GHz), 5G China Band N79 (4.8–5 GHz), and IEEE 802.11 ac (5.15–5.35 GHz, 5.725–5.85 GHz). The measured total efficiency and isolation are better than 70% and 15 dB, respectively. The calculated envelope correlation coefficient (ECC) is less than 0.02. The measured results are in good agreement with the simulated results.
Highlights
Fifth generation (5G) communications technology can offer many advantages over the fourth generation (4G) systems, such as higher transmission rates and shorter latency
To obtain the increasing demands of 5G communication, the multiple-input multiple-output (MIMO) technique is a promising technology in antenna design [1,2,3]
The antenna array consists of an open-loop ring resonator and a T-shape radiating element
Summary
Fifth generation (5G) communications technology can offer many advantages over the fourth generation (4G) systems, such as higher transmission rates and shorter latency. In sub-6 GHz 5G operations, MIMO antenna systems with high isolation, high gain and low ECC are needed to achieve high transmission rate and large channel capacity. Due to the limited space of the smartphones, the approach to design MIMO antenna array with good isolation performance is still a crucial challenge [15,16]. Various methods have been proposed to improve isolation between antenna elements [17,18,19,20,21,22]. The antenna applies the orthogonal monopole/dipole modes in the lower band while using the orthogonal slot and open slot modes in the higher band to obtain a high isolation during the entire frequency band [22]. The antenna array consists of an open-loop ring resonator and a T-shape radiating element. The capability of the proposed 4-antenna MIMO system is verified consistently by both simulation and measurement
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