Hepta‐band coupled‐fed antenna for metal‐ring‐frame WWAN/LTE smartphone applications

A small-size 40 mm × 10 mm coupled-fed antenna for hepta-band WWAN/LTE metal-ring-frame MRF smartphone applications is investigated. Unlike conventional solutions that remove the redundant resonances excited by the MRF, the proposed antenna makes full use of the MRF resonances. By meticulously co-design the antenna and MRF, multi-resonance frequencies are excited and integrated, which results in achieving hepta-band operation for an MRF smartphone antenna. Detail design considerations and experimental results of the proposed antenna are provided and analyzed. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:633-639, 2016.

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