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Wideband loop antennas with distributed elements are proposed for a fourth generation (4G) multiple‐input multiple‐output (MIMO) mobile terminal. The MIMO antenna system consists of two wideband loop antenna elements (Elements #1 and #3), working in the LTE Band 7 (0.88–0.96 GHz), and a printed U‐shaped monopole antenna element (Element #2), operating in the WiMAX/WLAN bands (2.0–2.8 GHz). To improve the performances of antenna elements, the distributed elements are employed to reduce the antenna volume, to realize the wideband property, and to modify the input impedance of antenna elements. The arrangement of each antenna element is carefully justified and each element is located at different corners of the ground plane to improve the isolation and envelope correlation coefficient (ECC) characteristics. The MIMO antenna has an ECC lower than 0.1 and isolation higher than 11 dB over the frequency bands of interest.
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Zhao et al. (2014) studied this question.
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