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Abstract
This paper proposes a low-profile two-element wireless local-area network (WLAN) multi-input multi-output (MIMO) antenna system designed for laptops. The primary and secondary elements are mirror-imaged 3-D metal-plate-loaded planar inverted-F antennas (PIFAs), each measuring only 31 mm × 2 mm × 2 mm. Although structurally simple, each PIFA can generate low- and high-frequency resonant modes through its long- and short-branches, respectively. In addition, the meander shorting metal section can easily be adjusted to shift the resonant frequency and to improve the impedance matching. Without any additional matching circuit or chip components, the antenna can cover the 2.4/5.2/5.8 GHz WLAN bands with a profile height of only 2 mm, which is smaller than the record low in the literature. Moreover, with the two PIFA elements deployed on the left and right sides of the top edge of the display ground plate, the measured isolation is larger than 23 dB in the low-frequency (high-frequency) band, and the measured realized radiation efficiency is at least 52% within all operating bands.
Acknowledgment
This work was supported by Ministry of Science Technology, R.O.C. (in Taiwan) [grant number MOST 106-2622-E-606-001-CC3].
Additional information
Funding
Notes on contributors
Shu-Chuan Chen
Shu-Chuan Chen received the BS and MS degrees in electrical engineering from National Defense University Chung Cheng Institute of Technology, Taoyuan, Taiwan, and the PhD 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 US, Taiwan, and China patents. Her main research interests are in internal antennas for mobile communication devices.
Wun-Siang Cai
Wun-Siang Cai was born in Hsinchu, Taiwan, in 1993. He received the BS and MS degrees, respectively, in electrical engineering from Minghsin University of Science and Technology, Hsinchu, Taiwan, in 2015, and the National Yunlin University of Science and Technology, Douliu, Taiwan, in 2017. His current research interests include antenna and microwave circuit design.Email: [email protected]
Chung-I. G. Hsu
Chung-I G Hsu graduated from the National Taipei Institute of Technology, Taipei, Taiwan, in 1980. He received the MS degree from the University of Mississippi, Oxford, MS, USA, in 1986, and the PhD degree from Syracuse University, Syracuse, NY, USA, in 1991. In the Spring 1992 semester, he was with the Microwave and Electromagnetics Laboratory, Texas A&M University, College Station, TX, USA, as a Visiting Scholar, where he did research on modeling of microstrip antennas. In 1992, he joined the Department of Electrical Engineering, Dayeh University, Changhua, Taiwan, as an associate professor. Since 2008, he has been with the National Yunlin University of Science and Technology, Douliu, Taiwan. His current research interests include antenna design and passive microwave circuit design.Email: [email protected]
Lung-Chi Chou
Lung-Chi Chou was born in Chiayi, Taiwan, in 1994. He received the BS and MS degrees, respectively, in electrical engineering from Dayeh University, Changhua, Taiwan, in 2015, and the National Yunlin University of Science and Technology, Douliu, Taiwan, in 2018. His current research interests include antenna and microwave circuit design.Email: [email protected]