Abstract
In this paper, an effective method for developing a multi-feed multiple-input multiple-output (MIMO) antenna system using the metal rims of a mobile phone without any structural interruption on the long edge frames is proposed. Instead of traditionally designing MIMO antennas with multiple similar antenna structures on the mobile phone frame or its ground plane, the MIMO antennas in this work are realized by reasonably constructing feeding points and grounding points on the entire edge frame. The MIMO antenna system established by such multi-feed technique is capable to achieve much simpler structural configuration, excellent isolation and matching performance while multiple antennas are connected. A planar eight-port MIMO antenna system operating in the 5G frequency band of 3.4~3.6 GHz is investigated initially, and subsequently applied to the curved metal-rims which comply with the industry design of a modern flagship mobile phone. The prototypes are fabricated and measured, evaluation results show that isolations among all ports are better than 15 dB with reflection coefficients below −10 dB within the band of 3.4~3.7 GHz and −6 dB within the band of 3.3~3.8 GHz. In addition, more than 57% total efficiency and envelope correlation coefficient (ECC) of less than 0.3 are obtained. The satisfactory performance reveals the proposed design of multi-feed MIMO antennas can be a promising candidate for 5G metal-rimmed mobile phone applications.
Highlights
As the public demand on higher data rate and throughput increases rapidly in recent years, the development of communication theories and technologies has to be greatly advanced
In order to reduce the space occupation of the planar eightfeed multiple-input multiple-output (MIMO) antenna system to the mobile phone and make the proposed antenna further adapted to practical phone industry design (ID), the 2-D eight-feed antenna scheme is transformed to 3-D MIMO antenna structure and an eightfeed MIMO antenna system designed on practical curved metal-rims is proposed
In this paper, an eight-port metal-rimmed MIMO antenna system using multi-feed technology is proposed for 5G mobile phone applications
Summary
As the public demand on higher data rate and throughput increases rapidly in recent years, the development of communication theories and technologies has to be greatly advanced. A traditional solution to alleviate such problem is to destroy the structural integrity and cut slots on the metal rims of the phones so as to achieve good electromagnetic (EM) wave radiation and proper antenna operation frequency. It forms the motivation of this paper to explore an efficient design methodology to realize the MIMO antenna system by directly exciting the metal rims of the mobile phone without adding additional structures, components or breaking the integrity of the metal rims on both long edge of a mobile terminal.
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