Low-profile switchable LTE/WWAN MIMO antenna system

Shu-Chuan Chen, Wun-Siang Cai, Chung-I G. Hsu and Meng-Kai Wu

Journal of Electromagnetic Waves and Applications, 2019, vol. 33, issue 4, 474-492

Abstract: This study proposes a low-profile switchable LTE/WWAN multi-input and multi-output (MIMO) antenna system for laptops. The main and auxiliary antennas, mirror-imaged of each other, are configured on the left and right sides of the top edge of the display ground plane. The two antennas are each a planar inverted-F antenna (PIFA) having the size of 102 × 5 × 3 mm3. The PIFA structure is matched in impedance with a set of reactive chip elements to increase the antenna operating bandwidth, and is combined with a set of switchable circuits to change the low-frequency resonant path in accordance with the switch status, ON or OFF, thus allowing the low-frequency modes to cover the LTE700 and GSM850/900 bands. Without any isolation element, an isolation of 15 dB or more can be achieved in the MIMO antenna system. The measured realized antenna efficiency is also 48% or greater.

Date: 2019
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DOI: 10.1080/09205071.2018.1557081

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