Self-Decoupled MIMO Antenna Pair With Shared Radiator for 5G Smartphones

Design of MIMO antenna system operating in wideband of 3300 to 6400 MHz for future 5G mobile terminal applications

“…The main contribution of our design is that we proposed an 8 × 8 MIMO antenna system with notable comprehensive improvements in the operation bandwidths, isolations, total efficiencies, and the size of required ground clearance. That is to say, when compared to References 30‐33, 39‐41, 45‐46, the proposed one can achieve all the presented MIMO performances without any ground clearance between frame and ground plane. In addition, when compared to the References 31‐33, 41, 46, and the proposed one not only has wider operation band, but also has higher isolations while their peak channel capacity is comparable.…”

“…That is to say, when compared to References 30‐33, 39‐41, 45‐46, the proposed one can achieve all the presented MIMO performances without any ground clearance between frame and ground plane. In addition, when compared to the References 31‐33, 41, 46, and the proposed one not only has wider operation band, but also has higher isolations while their peak channel capacity is comparable. Lastly, for future wideband 5G mobile communications, the proposed one can cover the additional 5G band of 5900 to 6400 MHz while the corresponding isolations of more than 16 dB are also obtained within this band, which has not been investigated in References 30‐46 listed in Table 1.…”

“…In addition, when compared to the References 31‐33, 41, 46, and the proposed one not only has wider operation band, but also has higher isolations while their peak channel capacity is comparable. Lastly, for future wideband 5G mobile communications, the proposed one can cover the additional 5G band of 5900 to 6400 MHz while the corresponding isolations of more than 16 dB are also obtained within this band, which has not been investigated in References 30‐46 listed in Table 1. Overall, all these good performance results benefited from the designed antenna structure and the arrangement of the 8 MIMO antennas.…”

“…It is interesting to note that there are several literatures have begun to focus on how to realize higher isolations in the MIMO antenna systems in the last year or two, and many good solutions have been proposed therein. [34][35][36][37][38][39][40][41][42][43][44] In which, for example, the decoupling techniques of self-isolated antenna element, self-decoupled MIMO antenna pairs, orthogonal polarization, pattern diversity, multimode decoupling, the tiny neutralizing line, and metasurface-based decoupling have been respectively reported. Although these methods can effectively achieve higher or at least improved isolations between antenna elements when 10 dB is used as the minimum requirement for isolation, they only considered the cases of single-or dual-band MIMO operation.…”

“…Moreover, in which, their isolations also need to be further improved for getting better MIMO performances. It is interesting to note that there are several literatures have begun to focus on how to realize higher isolations in the MIMO antenna systems in the last year or two, and many good solutions have been proposed therein 34‐44 . In which, for example, the decoupling techniques of self‐isolated antenna element, self‐decoupled MIMO antenna pairs, orthogonal polarization, pattern diversity, multimode decoupling, the tiny neutralizing line, and metasurface‐based decoupling have been respectively reported.…”