Abstract
In this paper, 4 × 4/8 × 8/10 × 10 multiple input multiple output (MIMO) antenna systems composed of co-located self-neutralized antenna pairs are proposed to operate at 4.8-5.0 GHz (part of N77 band) for the fifth-generation (5G) communication applications. The proposed antenna pairs consist of a loop antenna and a monopole antenna, co-locating together with a compact size of 6.7 × 15.5 ×3.08 mm 3 . Meanwhile, the co-located design can miniaturize 50% of the antenna size, which is quite significant for practical mobile applications with limited space environment. In addition, the adoption of the self-neutralization technique between the co-located loop antenna and the monopole antenna contributes to a satisfactory isolation with better than 25/20/16.5 dB for the 4 × 4/8 × 8/10 × 10 MIMO systems respectively. Analysis of the isolation improvement is also discussed in this study. Moreover, the antenna pairs are able to generate complementary radiation patterns, enabling the envelope correlation coefficients (ECC) between the antennas to be less than 0.1. Also, efficiencies of the MIMO antenna system achieve up to 60% as there is no external decoupling structure deteriorating the radiation performance of the proposed antenna pairs. Finally, a 4 × 4 MIMO antenna system prototype is fabricated and measured to verify its prospect for 5G MIMO applications.
Highlights
With the increasing demand on higher channel capacities and data rate in the mobile communication, the 5G multiple input multiple output (MIMO) research has been attracted much more attention among these days
Self-neutralization decoupling technique is proposed in the paper to achieve high isolation performance for the co-located antenna pairs
Compact size (50%) and better isolation performance are obtained simultaneously for the antenna pairs without any additional decoupling structure, which is of great significance for the industrial handset antenna applications
Summary
With the increasing demand on higher channel capacities and data rate in the mobile communication, the 5G MIMO research has been attracted much more attention among these days. The method to optimize the isolation between the co-located antenna pair is discussed to further verify the ‘‘self-neutralization’’ technique in the paper, which is distinguished from that in [22]–[27] Both of the loop antenna and the monopole antenna can obtain complementary radiation patterns because of the orthogonal current distribution along the radiating elements, which is of great significance for the MIMO antenna system. The active current along the ANT 1 makes it resonate at a one-wavelength mode, which can be observed from Fig. 2(a) Another working state of the proposed antenna pair is under the circumstance that the ANT 2 is excited at point the E while the ANT 1 is terminated with a 50 load at FIGURE 2. It is shown that the isolation between the ANT 1 and the ANT 2 can be optimized by adjusting the width of strip-C-D
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