An antenna design of smart-watch device with a metal frame structure is proposed. The dimension is 35mm × 35mm × 5mm. There are four antennas designed on a metal frame of smart-watch. The four antennas are fed by 4 microstrip lines to drive slots by using matching circuit. To achieve the required application band for GPS (1.575 GHz), WLAN 2.4 (2.4-2.484 GHz), C-band (3.4-3.6 GHz). For the port 1, it uses capacitive element to adjust matching and achieve for GPS band. For the port 2, it uses the direct feed the slot to reach the WLAN 2.4 band. For the port 3 and 4, they use the LC element to activate the slot to achieve wideband characteristic, and a symmetric MIMO architecture for 5G C-band application is also designed. Detailed results for antenna design of smart-watch will be discussed in the article.
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Lee et al. (2019) studied this question.
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