volume | PIER Journals

Abstract

This research offers a 12-element antenna array optimized for MIMO utilization in fifth-generation (5G) mobile phones. The antennas operate in the sub-6 GHz long-term evolution (LTE) frequency range, specifically between 3.4 and 3.6 GHz. To fulfil the growing demand for faster data speeds and reliable connection in 5G networks, the presented MIMO antenna setup offers a balance between compact size and high performance, making it well suited for integration into smartphones. Every radiating element in the array is tuned to approximately 3.5 GHz and features an open-slot structure, which effectively reduces mutual coupling and enhances isolation. Antenna arrangement has been constructed on an FR-4 substrate of dimensions 150 mm × 80 mm × 0.8 mm, corresponding to the layout restrictions of standard 6-inches smartphones. A prototype was developed to validate the design through measurements. The results demonstrate excellent impedance matching (return loss > 10 dB), high isolation (> 20 dB), strong radiation efficiency (exceeding 66%), and a low envelope correlation coefficient (< 0.03) covering the target frequency range.

1. Hong, Wonbin, "Solving the 5G mobile antenna puzzle: Assessing future directions for the 5G mobile antenna paradigm shift," IEEE Microwave Magazine, Vol. 18, No. 7, 86-102, Nov.-Dec. 2017. Google Scholar

2. Li, Yixin, Yong Luo, Guangli Yang, et al. "12-port 5G massive MIMO antenna array in sub-6GHz mobile handset for LTE bands 42/43/46 applications," IEEE Access, Vol. 6, 344-354, 2017. Google Scholar

3. Xu, Hang, Hanyang Wang, Steven Gao, Hai Zhou, Yi Huang, Qian Xu, and Yujian Cheng, "A compact and low-profile loop antenna with six resonant modes for LTE smartphone," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 9, 3743-3751, Sep. 2016. Google Scholar

4. Zhang, Shuai, Zhinong Ying, Jiang Xiong, and Sailing He, "Ultrawideband MIMO/diversity antennas with a tree-like structure to enhance wideband isolation," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 1279-1282, 2009. Google Scholar

5. Lee, Jae-Yeong, Seung-Han Kim, and Jae-Hyung Jang, "Reduction of mutual coupling in planar multiple antenna by using 1-D EBG and SRR structures," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 9, 4194-4198, Sep. 2015. Google Scholar

6. Li, Zhengyi, Zhengwei Du, Masaharu Takahashi, Kazuyuki Saito, and Koichi Ito, "Reducing mutual coupling of MIMO antennas with parasitic elements for mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 2, 473-481, Feb. 2012. Google Scholar

7. Zhang, Shuai, Buon Kiong Lau, Yi Tan, Zhinong Ying, and Sailing He, "Mutual coupling reduction of two PIFAs with a T-shape slot impedance transformer for MIMO mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 3, 1521-1531, Mar. 2012. Google Scholar

8. Ban, Yong-Ling, Chuan Li, Gang Wu, Kin-Lu Wong, et al. "4G/5G multiple antennas for future multi-mode smartphone applications," IEEE Access, Vol. 4, 2981-2988, 2016. Google Scholar

9. Alibakhshikenari, Mohammad, Fatemeh Babaeian, Bal S. Virdee, Sonia Aïssa, Leyre Azpilicueta, Chan Hwang See, Ayman Abdulhadi Althuwayb, Isabelle Huynen, Raed A. Abd-Alhameed, Francisco Falcone, and Ernesto Limiti, "A comprehensive survey on “Various decoupling mechanisms with focus on metamaterial and metasurface principles applicable to SAR and MIMO antenna systems”," IEEE Access, Vol. 8, 192965-193004, 2020. Google Scholar

10. Alibakhshikenari, Mohammad, Bal S. Virdee, and Ernesto Limiti, "Study on isolation and radiation behaviours of a 34×34 array-antennas based on SIW and metasurface properties for applications in terahertz band over 125-300 GHz," Optik, Vol. 206, 163222, Mar. 2020. Google Scholar

11. Alibakhshikenari, Mohammad, Bal S. Virdee, Panchamkumar Shukla, Chan H. See, Raed A. Abd-Alhameed, Francisco Falcone, Karim Quazzane, and Ernesto Limiti, "Isolation enhancement of densely packed array antennas with periodic MTM‐photonic bandgap for SAR and MIMO systems," IET Microwaves, Antennas & Propagation, Vol. 14, No. 3, 183-188, 2019. Google Scholar

12. Alibakhshikenari, Mohammad, Mohsen Khalily, Bal Singh Virdee, Chan Hwang See, Raed A. Abd-Alhameed, and Ernesto Limiti, "Mutual-coupling isolation using embedded metamaterial EM bandgap decoupling slab for densely packed array antennas," IEEE Access, Vol. 7, 51827-51840, 2019. Google Scholar

13. Wong, Kin-Lu, Chih-Yu Tsai, and Jun-Yu Lu, "Two asymmetrically mirrored gap-coupled loop antennas as a compact building block for eight-antenna MIMO array in the future smartphone," IEEE Transactions on Antennas and Propagation, Vol. 65, No. 4, 1765-1778, Apr. 2017. Google Scholar

14. Wong, Kin-Lu, Bo-Wei Lin, and B. Li, "Dual‐band dual inverted‐F/loop antennas as a compact decoupled building block for forming eight 3.5/5.8‐GHz MIMO antennas in the future smartphone," Microwave and Optical Technology Letters, Vol. 59, No. 11, 2715-2721, 2017. Google Scholar

15. Zhao, Anping and Zhouyou Ren, "Size reduction of self-isolated MIMO antenna system for 5G mobile phone applications," IEEE Antennas and Wireless Propagation Letters, Vol. 18, No. 1, 152-156, Jan. 2019. Google Scholar

16. 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, Nov. 2018. Google Scholar

17. Ling, XueMing and RongLin Li, "A novel dual-band MIMO antenna array with low mutual coupling for portable wireless devices," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 1039-1042, 2011. Google Scholar

18. Al-Hadi, Azremi Abdullah, Janne Ilvonen, Risto Valkonen, and Ville Viikari, "Eight‐element antenna array for diversity and MIMO mobile terminal in LTE 3500 MHz band," Microwave and Optical Technology Letters, Vol. 56, No. 6, 1323-1327, 2014. Google Scholar

19. Wong, Kin-Lu and Jun-Yu Lu, "3.6‐GHz 10‐antenna array for MIMO operation in the smartphone," Microwave and Optical Technology Letters, Vol. 57, No. 7, 1699-1704, 2015. Google Scholar

20. Li, Ming-Yang, Yong-Ling Ban, Zi-Qiang Xu, Gang Wu, Chow-Yen-Desmond Sim, Kai Kang, and Zhe-Feng Yu, "Eight-port orthogonally dual-polarized antenna array for 5G smartphone applications," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 9, 3820-3830, Sep. 2016. Google Scholar

21. Zhang, Zhijun, Antenna Design for Mobile Devices, John Wiley & Sons, 2017.

22. Sharawi, Mohammad S., Abdelmoniem T. Hassan, and Muhammad U. Khan, "Correlation coefficient calculations for MIMO antenna systems: A comparative study," International Journal of Microwave and Wireless Technologies, Vol. 9, No. 10, 1991-2004, 2017. Google Scholar

23. Tian, Ruiyuan, Buon Kiong Lau, and Zhinong Ying, "Multiplexing efficiency of MIMO antennas," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 183-186, 2011. Google Scholar

24. Zhang, Shuai, Kun Zhao, Zhinong Ying, and Sailing He, "Adaptive quad-element multi-wideband antenna array for user-effective LTE MIMO mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 8, 4275-4283, Aug. 2013. Google Scholar

25. Ren, Zhouyou, Anping Zhao, and Shengjie Wu, "MIMO antenna with compact decoupled antenna pairs for 5G mobile terminals," IEEE Antennas and Wireless Propagation Letters, Vol. 18, No. 7, 1367-1371, Jul. 2019. Google Scholar

26. 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, Aug. 2019. Google Scholar

27. 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, Jan. 2016. Google Scholar

28. Li, Yixin, Yong Luo, Guangli Yang, et al. "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, Jun. 2019. Google Scholar

Dr. Tanishk Thakur

Dr. Naveen Jaglan