Reconfigurable long-term evolution/wireless wide area network antennas integrated with the metal frame of tablet computers

Shu-Chuan Chen, Chih-Chia Huang and Ming-Chan Hsu

Journal of Electromagnetic Waves and Applications, 2017, vol. 31, issue 15, 1609-1623

Abstract: This study proposed a reconfigurable antenna design integrated with the metal frame of tablet computers that can switch between long-term evolution (LTE) and wireless wide area network (WWAN) frequencies. The antenna is installed in a 75 × 5 mm clearance without the ground plane, and a 2 mm opening is created on the metal frame on the top right side of the clearance, which create an open-slot structure. Moreover, this antenna structure contains a switch element; switching between on and off forms two antenna structures that generate two resonant modes of the antenna structure, as well as excites other resonant modes of the open-slot structure. Therefore, the proposed antenna design can cover both the low-frequency (i.e. LTE700/GSM850/900) and high-frequency (i.e. GSM1800/1900/UMTS/LTE2300/2500) bands of LTE/WWAN frequencies. Specifically, without using matching circuits, the proposed antenna can cover the eight frequency bands required for LTE/WWAN within a profile height of 5 mm simply by incorporating a switch element in the structure; hence, the proposed design is highly suitable for application in tablet devices with a narrow border. In addition, this antenna can be closely integrated with its surrounding metal elements and the measured results revealed an antenna efficiency of ≥50%, exceeding the requirement for actual application.

Date: 2017
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DOI: 10.1080/09205071.2017.1356753

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