Compact Configured 5G Dual-Band MIMO Loop Antenna System

Abstract

This paper presents a compact configured 5G dual-band MIMO loop antenna system for laptop computers. The antenna system consists of two identical 95 × 2 mm² four-antenna units that are arranged on the top edge of the display ground plane and are 10 mm away from the left and right sides. The four-antenna unit, each being a two-dimensional loop antenna of the same structure and size, are constructed on the on a 0.4 mm-thick FR4 substrate. The loop antenna with only 23 × 2 mm² size is composed of a T-shaped feed-in section and a double short-circuit loop. In addition, the four loop antennas are arranged in the same direction and side by side with only 1 mm space to form a high-isolation four-antenna unit. The two sets of four-antenna units can cover 5G dual-band operation at 3300–3600 MHz and 4800–5000 MHz. The measured isolation between eight antennas is all better than 15 dB, the measured antenna efficiency is between 35% and 62%, and the measured envelop correlation coefficient ECC calculated from the electric-field radiation pattern is all less than 0.2. This compactly configured eight-antenna system is only 2 mm high in profile, making it ideal for use in 5G laptops with a high screen-to-body ratio.

KEYWORDS:

• Laptop antennas
• Loop antennas
• Multi-input multi-output (MIMO) antennas
• 5G antennas

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Ministry of Science and Technology Taiwan: [grant number MOST 109-2221-E-606-016-].

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 those from US, Taiwan, and China. Her main research interests are in in-door antennas for mobile communication devices.

Sheng-Min Li

Sheng-Min Li received the BS degree in electrical engineering from the Chung Cheng Institute of Technology, National Defense University (CCIT, NDU), Taoyuan, Taiwan, in 2016, and is currently pursuing the MS degree in electrical engineering from the Chung Cheng Institute of Technology, National Defense University (CCIT, NDU), Taoyuan, Taiwan. His main research interests are in in-door antennas for mobile communication devices. His current research interests include antenna and microwave circuit design. Email: [email protected]

Bo-Xun Lai

Bo-Xun Lai received the BS degrees in communication engineering from the Oriental Institute of Technology, New Taipei, Taiwan, in 2020, and is currently pursuing the MS degree in electrical engineering from the Chung Cheng Institute of Technology, National Defense University (CCIT, NDU), Taoyuan, Taiwan. His main research interests are in in-door antennas for mobile communication devices. His current research interests include antenna and microwave circuit design. Email: [email protected]