Four‐feed reconfigurable MIMO antenna for metal‐frame smartphone applications. Issue 9 (20th April 2018)

• Record Type: Journal Article
• Authors: Zhang, Yong‐Hang; Yang, Shi‐Rong; Ban, Yong‐Ling; Qiang, Yun‐Fei; Guo, Jinhong; Yu, Zhe‐Feng
• Is Part Of: IET microwaves, antennas & propagation. Volume 12:Issue 9(2018)
• Page Start: 1477
• Page End: 1482
• Publication Date: 2018-04-20
• Subjects: smart phones -- MIMO communication -- UHF antennas -- monopole antenna arrays -- slot antenna arrays -- antenna feeds -- Long Term Evolution -- wide area networks -- mobile antennas -- p‐i‐n diodes; four‐feed reconfigurable MIMO antenna -- metal‐frame smartphone applications -- reconfigurable multiple‐input multiple‐output antenna design -- hepta‐band LTE‐WWAN -- monopole slots -- system ground -- PIN diodes -- return loss -- envelope correlation coefficient -- mean effective gain -- channel capacity -- frequency 824 MHz to 960 MHz -- frequency 1710 MHz to 2690 MHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2017.0654
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A reconfigurable multiple‐input multiple‐output (MIMO) antenna design for the smartphone with a metal frame capable of covering hepta‐band LTE/WWAN is proposed. The proposed antenna has four monopole slots (two long slots and two short slots) etched on the top and bottom side of the system ground, respectively. Two PIN diodes are inserted into the two long monopole slots. When these two PIN diodes are OFF, the two long monopole slots can generate the desired lower‐band (824–960 MHz) which can be applied in a 2 × 2 MIMO system. When these two PIN diodes are ON, the corresponding lengths of these two long slots are decreased to the same length as the short slots. Then these four ports can excite the desired upper‐band (1710–2690 MHz) which can be used for a 4 × 4 MIMO system. In addition, the performances of the proposed antenna including the return loss, isolation, efficiency, envelop correlation coefficient, mean effective gain, and channel capacity are presented.