Abstract
This paper presents a compact dual-band four-element multiple-input multiple-output (MIMO) antenna system for the fifth-generation (5G) laptops with a large display-to-body ratio. The four antenna elements, each being a three-dimensional inverted-F antenna (IFA) of the same structure and size, are constructed on the same T-cross-sectioned substrate, the vertical part of which is embedded in the $1\times64$ mm2 clearance area created from the upper edge of the display ground plane. They are configured into two dual-antenna units. Within each unit, the two IFAs are arranged to be skew-symmetric with respect to the display ground plane, and their short-circuit points are brought close to each other to achieve the so-called short-circuit decoupling. In addition, the two units are mirror imaged of each other with a small gap in between and are connected by two decoupling chip inductors to form a high-isolation four-element MIMO antenna system. In the operating bands of 3300–3600 and 4800–5000 MHz required by 5G, the measured isolation is larger than 10 dB, and the measured antenna efficiency is beyond 35 %, both being large enough for practical applications. In particular, the proposed MIMO antenna system has a profile height of only 1.4 mm, which is very small, making it suitable for laptops with a large display-to-body ratio.
Highlights
With most consumers’ preference for lightweight laptops having a large display, a series of light, large-display laptops have been launched on the market
In [18], the two antennas with a profile height of only 4 mm in the two-element multiple-input multiple-output (MIMO) antenna system for the 3.6-GHz long-term evolution (LTE) operation are excited with different mechanisms, so that the different near-field characteristics lead to an isolation of larger than 12 dB even without any additional decoupling component inserted in the small spacing of only 2 mm
MIMO ANTENNA SYSTEM STRUCTURE Figure 1 shows the overall configuration of the proposed dual-band four-element MIMO antenna system mounted around the top edge of a laptop
Summary
With most consumers’ preference for lightweight laptops having a large display, a series of light, large-display laptops have been launched on the market. Chen et al.: Compact Four-Element MIMO Antenna System for 5G Laptops three-dimensional structures to achieve miniaturization and a low profile for the designed antenna, sometimes one can use chip inductors and capacitors to form matching circuits [7], [8]. In [18], the two antennas with a profile height of only 4 mm in the two-element MIMO antenna system for the 3.6-GHz LTE operation are excited with different mechanisms, so that the different near-field characteristics lead to an isolation of larger than 12 dB even without any additional decoupling component inserted in the small spacing of only 2 mm.
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