Abstract
The difficulty of antenna design applied to glasses is that the structure of glasses is too single, and the space available for antenna design is greatly limited. In this background, the integrated design of 4G antennas and 5G antennas applied to glasses is proposed in this paper. The most important highlight of this design is that it makes full use of the limited three-dimensional space structure provided by glasses and achieves the perfect combination of the antenna and glasses in the physical structure. Specifically, two antennas for 4G communication are arranged on two glasses frames, and four antennas for 5G communication are arranged on two glasses legs. In this way, we can make full use of the space provided by the glasses to design antennas and ensure that there is a certain distance between the 4G antennas and 5G antennas so that the performance of both 4G antennas and 5G antennas can be guaranteed. The 4G antenna consists of a loop structure printed on the frame and leg of the glasses and a parasitic branch strip printed on the front of the leg of the glasses. The resonance modes of the 4G antenna are mainly loop, monopole, and dipole modes, which can cover two 4G bands of 0.824-0.96 GHz and 1.71-2.69 GHz. Each 5G antenna mainly comes from the open slot mode etched on the metal ground surface of an FR4 substrate of the glasses leg. In addition, the slot antennas operate in two 5G bands of 3.3-3.6 GHz and 4.8-5.0 GHz. Finally, the glasses and the antennas are fabricated based on FR4 substrates and measured. The measured results show that the proposed antennas perform well and have the potential to be used in 4G/5G communications through glasses.
Highlights
In recent years, wearable smart devices with wireless communication capabilities have received widespread attention, such as Google’s smart glasses in 2012, Apple’s smart watch in 2014, and LG’s smart watch in 2015
Research on antennas in wearable smart devices focused on Bluetooth or WIFI antennas [1]–[5], such as dual WIFI antennas on smart glasses [1] and multi Bluetooth antennas made of transparent materials [5]
This paper provides a glasses MIMO antenna scheme for 4G/5G communication
Summary
Wearable smart devices with wireless communication capabilities have received widespread attention, such as Google’s smart glasses in 2012, Apple’s smart watch in 2014, and LG’s smart watch in 2015. To tune the resonant frequencies of the antenna and improve the matching characteristics of the proposed antenna, a lumped capacitance C. cap is loaded at the C1 point of the loop structure with a capacitance value of 0.4 pF [12], [13]. Due to the existence of breakpoint D1 in the loop structure, the monopole mode, namely mode 2, is generated by the branch strip formed by A1B1C1D1 at the frequency of 0.89 GHz. By introducing the lumped capacitance C. cap based on reference antenna Ref, it can be seen that the resonant frequencies of mode 1 and mode 2 of Ant can be tuned to the desired frequency band, and the matching characteristics of mode 1 and mode 2 are greatly improved. The distance between the two 5G antennas Ant and Ant is 28.5 mm, the isolation between them is still 11 dB
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