Abstract
This paper presents a miniaturized dual-polarized Multiple Input Multiple Output (MIMO) antenna with high isolation. The antenna meets the constraints of sub-6 GHz 5G and the smartphones’ X-band communications. A vertically polarized modified antipodal Vivaldi antenna and a horizontally polarized spiral antenna are designed and integrated, and then their performance is investigated. Three frequency bands of 3.8 GHz, 5.2 GHz, and 8.0 GHz are considered, and the proposed dual-polarized antenna is studied. High isolation of greater than 20 dB is obtained after integration of metamaterial elements, and without applying any other decoupling methods. The proposed triple-band metamaterial-based antenna has 1.6 GHz bandwidth (BW) (2.9 GHz–4.5 GHz), 13.5 dBi gain, and 98% radiation efficiency at 3.8 GHz. At 5.2 GHz it provides 1.2 GHz BW, 9.5 dBi gain, and 96% radiation efficiency. At 8.0 GHz it has 1 GHz BW, 6.75 dBi gain, and 92% radiation efficiency. Four antenna elements (with eight ports) were laid out orthogonally at the four corners of a mobile printed circuit board (PCB) to be utilized as a MIMO antenna for 5G communications. The performance of the MIMO antenna is examined and reported.
Highlights
In cellular communication, when the number of users increases, because of insufficient channel bandwidth, the frequency provision becomes inadequate
They show that the proposed Multiple Input Multiple Output (MIMO) antenna and its integration in smartphones provide better performance in terms of isolation, gain, operating frequency bandwidth, radiation efficiency, and the Envelope Correlation Coefficient (ECC)
Eight antenna elements were placed at the four corners of a smartphone board to be used for the communication links
Summary
In cellular communication, when the number of users increases, because of insufficient channel bandwidth, the frequency provision becomes inadequate. The inevitable mutual coupling between antenna elements in a MIMO system is important, which affects the antenna’s characteristics negatively It disturbs the pattern correlation and radiation efficiency. The decoupling technique is a way to suppress the mutual coupling (enhance the isolation) in MIMO and array antennas It has been utilized in various frequency bands and applications such as Long-Term Evolution (LTE). The use of metasurfaces and metamaterials in antennas has shown promising improvement by decreasing mutual coupling They are limited by the number of elements that can be added to a design [20,21,22,23].
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