Abstract
Multi-user multiple-input and multiple-output (MU-MIMO) systems are the mainstream of current antenna design. This paper proposes a dual-band 6 × 6 MIMO glasses antenna for Wi-Fi 6E and Wi-Fi 7 indoor wireless communication. The six antennas have the same structure, all of which are F-shaped monopole antennas. They are on the left and right temples, at the upper and lower ends of the left and right frames, which effectively uses the space of the glasses. The substrate uses FR4 (εr=4.4, tanδ=0.02). The antenna design is compact (9 mm × 50 mm × 0.8 mm) and the glasses model is made of FR4. The overall model is similar to virtual reality (VR) glasses, which are convenient for a user to wear. The proposed antenna has three working frequency bands, at 2.4 GHz, 5 GHz, and 6 GHz. Through matching and optimization, the reflection coefficient can be lower than −10 dB. In addition, this paper evaluates two usage environments for simulation and measurement on the head and free space. The measurement results show that when the operating frequency band is at 2.45 GHz, the antenna efficiency is 86.1%, and the antenna gain is 1.9 dB. At 5.5 GHz, the antenna efficiency is 86.5%, and the antenna gain is 4.4 dB. At 6.7 GHz, the antenna efficiency is 85.4%, and the antenna gain is 3.7 dB. When the isolation of the MIMO antenna system is optimized, the low-frequency band is better than −10 dB, and the high-frequency band is better than −20 dB. The measured envelope correlation coefficient (ECC) values are all lower than 0.1.
Highlights
Wearable devices have become very popular in consumer electronics and biomedical applications
After the release of the IEEE 802.11 ax protocol in 2020, current Wi-Fi 6E wireless routers can support up to 8 × 8 Multi-user multiple-input and multiple-output (MU-MIMO), which have eight antennas providing input or output at the same time, and adds multi-user capability to MIMO in the wireless realm
Glasses antenna improves the basic transmission speed, and uses six identical planar monopole antennas placed on the FR4, which is thinner than commercially available glasses
Summary
Wearable devices have become very popular in consumer electronics and biomedical applications. There are various wearable devices, such as smart bracelets, smart rings, smart gloves, smart glasses, and other devices. These wearable devices have in common that they are thin, light, and ergonomic. Communication modulation in wearable devices has gradually evolved from Wi-Fi indoor technology to 4G cellular network and 5G mm wave beamforming. More and more companies are developing smart glasses products like those of Google and Facebook. The popularization of intelligent wearable devices will significantly improve people’s living habits [1–4]
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