Abstract

This study proposes a dual-band MIMO antenna with high element isolation for 5G smartphones. The antenna unit consists of stacked F-shaped radiators, perpendicular to the motherboard, printed on the outer side frames. The antenna feeder is shaped like the Chinese character ``正'' and is printed on the inner surface of the side substrate. Based on this design, eight F-shaped antenna units are placed at the ends of two long side panels, forming an 8-element MIMO antenna system. High isolation in the operating bands is achieved using ground stubs and defective ground structures (DGSs). All radiating elements are etched on a low-cost FR4 substrate with a total size of 150×75×6.8 mm³. The antenna system is modeled and measured to operate in the N78 (3.3-3.8 GHz), N79 (4.4-5.0 GHz), and WLAN 5 GHz bands (5.15-5.85 GHz). The isolation between neighboring antenna units is greater than 15 dB, with total efficiencies ranging from 62% to 79%, and a measured envelope correlation coefficient (ECC) of less than 0.01. Additionally, the antenna performance in one-handed and two-handed holding scenarios has been evaluated, showing favorable results. These findings demonstrate that the proposed antenna system is well suited for MIMO applications in 5G smartphones.

1. Fu, Zhenning and Wenhui Shen, "Eight‐element self‐decoupled MIMO antenna design for 5G smartphones," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 31, No. 3, e22523, Jan. 2021.
doi:

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2. Wang, Yonghao, Xin Wang, Junlin Wang, and Rui Shao, "Dual-band highly isolated eight-element MIMO antenna for 5G mobile phone," Applied Computational Electromagnetics Society Journal (ACES), Vol. 37, No. 5, 588-596, 2022.
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3. Sun, Libin, Haigang Feng, Yue Li, and Zhijun Zhang, "Compact 5G MIMO mobile phone antennas with tightly arranged orthogonal-mode pairs," IEEE Transactions on Antennas and Propagation, Vol. 66, No. 11, 6364-6369, 2018.
doi:

4. Deng, Changjiang, Di Liu, and Xin Lv, "Tightly arranged four-element MIMO antennas for 5G mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 10, 6353-6361, 2019.

5. Dong, Jian, Shan Wang, and Jinjun Mo, "Design of a twelve-port MIMO antenna system for multi-mode 4G/5G smartphone applications based on characteristic mode analysis," IEEE Access, Vol. 8, 90751-90759, 2020.

6. Zhao, Anping and Zhouyou Ren, "Multiple-input and multiple-output antenna system with self-isolated antenna element for fifth-generation mobile terminals," Microwave and Optical Technology Letters, Vol. 61, No. 1, 20-27, 2019.

7. Gurjar, Rohit, Dharmendra K. Upadhyay, Binod K. Kanaujia, and Amit Kumar, "A compact modified Sierpinski carpet fractal UWB MIMO antenna with square-shaped funnel-like ground stub," AEU --- International Journal of Electronics and Communications, Vol. 117, 153126, 2020.

8. Guo, Yuke, Jinghui Xue, and Luyu Zhao, "Decoupling of MIMO antenna with dummy antennas for 5G mobile terminals," 2022 International Applied Computational Electromagnetics Society Symposium (ACES-China), 1-2, Xuzhou, China, 2022.

9. Du, Kaiwen, Yongshun Wang, Lijun Zhang, and Yao Hu, "Design of wideband decoupling antenna pairs for 5G portable devices at N77/N78/N79 bands," Micromachines, Vol. 13, No. 11, 1964, 2022.

10. Hei, Yong Qiang, Jia Geng He, and Wen Tao Li, "Wideband decoupled 8-element MIMO antenna for 5G mobile terminal applications," IEEE Antennas and Wireless Propagation Letters, Vol. 20, No. 8, 1448-1452, 2021.

11. Chou, Jui-Hung, Jo-Fan Chang, Ding-Bing Lin, and Tzong-Lin Wu, "Dual‐band WLAN MIMO antenna with a decoupling element for full‐metallic bottom cover tablet computer applications," Microwave and Optical Technology Letters, Vol. 60, No. 5, 1245-1251, 2018.

12. Li, Yixin, Chow-Yen-Desmond Sim, Yong Luo, and Guangli Yang, "High-isolation 3.5 GHz eight-antenna MIMO array using balanced open-slot antenna element for 5G smartphones," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 6, 3820-3830, 2019.

13. Wong, Kin-Lu, Jun-Yu Lu, Li-Yu Chen, Wei-Yu Li, and Yong-Ling Ban, "8‐antenna and 16‐antenna arrays using the quad‐antenna linear array as a building block for the 3.5‐GHz LTE MIMO operation in the smartphone," Microwave and Optical Technology Letters, Vol. 58, No. 1, 174-181, 2016.

14. Chang, Le, Yafang Yu, Kunpeng Wei, and Hanyang Wang, "Polarization-orthogonal co-frequency dual antenna pair suitable for 5G MIMO smartphone with metallic bezels," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 8, 5212-5220, 2019.

15. Sun, Libin, Yue Li, Zhijun Zhang, and Hanyang Wang, "Self-decoupled MIMO antenna pair with shared radiator for 5G smartphones," IEEE Transactions on Antennas and Propagation, Vol. 68, No. 5, 3423-3432, 2020.

16. Chou, Jui-Hung, Jo-Fan Chang, Ding-Bing Lin, and Tzong-Lin Wu, "Dual‐band WLAN MIMO antenna with a decoupling element for full‐metallic bottom cover tablet computer applications," Microwave and Optical Technology Letters, Vol. 60, No. 5, 1245-1251, 2018.

17. Li, Yixin, Chow-Yen-Desmond Sim, Yong Luo, and Guangli Yang, "High-isolation 3.5 GHz eight-antenna MIMO array using balanced open-slot antenna element for 5G smartphones," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 6, 3820-3830, 2019.

18. Cui, Lun, Jingli Guo, Ying Liu, and Chow-Yen-Desmond Sim, "An 8-element dual-band MIMO antenna with decoupling stub for 5G smartphone applications," IEEE Antennas and Wireless Propagation Letters, Vol. 18, No. 10, 2095-2099, 2019.

19. Wang, Zhonggen, Mingzhong Li, Ming Yang, Wenyan Nie, Weidong Mu, Han Lin, and Zhongyuan Lu, "Design of wideband 8-element MIMO mobile phone antenna based on sub-6 GHz NR band," Progress In Electromagnetics Research C, Vol. 129, 187-201, 2023.

20. Cheng, Bo and Zhengwei Du, "Dual polarization MIMO antenna for 5G mobile phone applications," IEEE Transactions on Antennas and Propagation, Vol. 69, No. 7, 4160-4165, 2021.

21. Addepalli, Tathababu, Manish Sharma, M. Satish Kumar, Naveen Kumar Gollamudi, Prabhakara Rao Kapula, and Ch. Manohar Kumar, "Self-isolated miniaturized four-port multiband 5G sub 6 GHz MIMO antenna exclusively for N77/N78 & N79 wireless band applications," Wireless Networks, Vol. 30, No. 2, 1037-1053, 2024.

22. Addepalli, Tathababu, V. Siva Nagaraju, Sivasubramanyam Medasani, Jetti Chandrasekhar Rao, Prasanthi Badugu, Ch. Manohar Kumar, Rajyalakshmi Uppada, and Bandi Kiran Kumar, "Four‐element equilateral triangular‐shaped MIMO antenna with connected ground for 5G sub: 6 GHz N79 and WiFi‐6E band applications," International Journal of Communication Systems, Vol. 37, No. 16, e5895, 2024.

Dr. Yingjian Hou

Professor Zhonggen Wang

Dr. Ming Yang

Dr. Jinzhi Zhou

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