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ABSTRACT
This paper proposes a 3.5-GHz four-element multi-input multi-output (MIMO) antenna system for fifth-generation (5G) laptops. The four antennas are configured into two dual-antenna units, measuring 26 × 3 × 2 mm3 each and separated by a distance of 6 mm, the latter of which accounts for the isolation between the two units. The two antennas in each unit are located on the two sides of the same substrate and are both three-dimensional inverted-F antennas (IFAs) of the same size, but are deployed to be skew-symmetric with respect to the top edge of the display ground. With a decoupling neutralization line connecting the two antennas in the same unit, the simulated isolation between them is enhanced by up to 8 dB. Within the operating frequency band, its measured isolation exceeds 12 dB, the simulated electric field ECC (envelope correlation coefficient) is smaller than 0.15, and the measured realized radiation efficiency is more than 40%.
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No potential conflict of interest was reported by the authors.
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Notes on contributors
Shu-Chuan Chen
Shu-Chuan Chen received the B.S. and M.S. degrees in electrical engineering from National Defense University Chung Cheng Institute of Technology, Taoyuan, Taiwan, and the Ph.D. degree in electrical engineering from National Sun Yat-sen University, Kaohsiung, Taiwan, in 1998, 2004, and 2012, respectively. Since 2012 she has been an assistant professor in the department of electrical and electronic engineering, Chung Cheng Institute of Technology, National Defense University, (CCIT, NDU), Taoyuan, Taiwan, where she became an associate professor in 2016. She also holds over 20 patents, including the US, Taiwan, and China patents. Her main research interests are in internal antennas for mobile communication devices.
Meng-Kai Wu
Meng-Kai Wu received the B.S. and M.S. degrees, respectively, in communications engineering from Mingsin University of Science and Technology, Hsinchu, Taiwan, in 2015, and in electrical engineering from National Yunlin University of Science and Technology, Yunlin, Taiwan. His current research interests are in internal antennas for mobile communication devices.
Cheng-Wei Chiang
Cheng-Wei Chiang received the B.S. and M.S. degrees, respectively, in electrical engineering from Chung Hua University, Hsinchu, Taiwan, in 2017, and the National Yunlin University of Science and Technology, Douliu, Taiwan, in 2019. His current research interests include antenna and microwave circuit design.
Ming-Shing Lin
Ming-Shing Lin received the B.S.E.E. degree in electrical engineering from the National Cheng Kung University, Tainan, Taiwan, in 1980, and the M.S.E.E. and Ph.D. degrees in electrical engineering from the National Taiwan University, Taipei, Taiwan, in 1982 and 1993, respectively. From 1983 to 1997, he was with the Aerospace Industrial Development Corporation (AIDC), Taiwan, where he was a Technical Manager of the Electromagnetic Effect Laboratory. From 1998 to 2004, he was with the faculty of Da-Yeh University and National Chin-Yi University of Technology. Since August 2004, he has been an Associate Professor in the Department of Electrical Engineering, National Yunlin University of Science and Technology, Yunlin, Taiwan. His current research interests include electromagnetic compatibility, antennas, and electromagnetic properties of materials. Dr. Lin was also a Registered Lead Assessors of Taiwan Accreditation Foundation (TAF).