Orthogonally dual‐polarised MIMO antenna array with pattern diversity for use in 5G smartphones. Issue 6 (19th February 2020)

• Record Type: Journal Article
• Authors: Ojaroudi Parchin, Naser; Al‐Yasir, Yasir I.A.; Jahanbakhsh Basherlou, Haleh; Abd‐Alhameed, Raed A.; Noras, James M.
• Is Part Of: IET microwaves, antennas & propagation. Volume 14:Issue 6(2020)
• Page Start: 457
• Page End: 467
• Publication Date: 2020-02-19
• Subjects: antenna radiation patterns -- electromagnetic wave polarisation -- microstrip lines -- MIMO communication -- antenna phased arrays -- 5G mobile communication -- smart phones -- mobile antennas -- microstrip antenna arrays -- millimetre wave antenna arrays; double‐fed circular‐ring resonators -- smartphone printed circuit board -- antenna elements -- radiation pattern diversity function -- orthogonal placement -- feed lines -- rectangular slot -- microstrip feed‐line -- mutual coupling characteristic -- antenna ports -- circular‐ring slot resonator -- smartphone antenna array -- single‐element radiator -- polarisation diversity -- MIMO antenna design -- end‐fire radiation beams -- orthogonally dual‐polarised MIMO antenna array -- pattern diversity -- radiation pattern diversity -- microstrip‐lines -- radiation coverage -- phased array millimetre‐wave antenna design -- 5G smartphone antenna -- frequency 3.3 GHz to 3.9 GHz -- frequency 3.1 GHz to 4.3 GHz; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2019.0328
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : A new multiple‐input/multiple‐output (MIMO) antenna design is introduced for future smartphones. The proposed design contains four pairs of double‐fed circular‐ring resonators located at different edges of the smartphone printed circuit board (PCB) with an FR‐4 substrate and a dimension of 75 × 150 mm 2 . The antenna elements are fed by 50‐Ohm microstrip‐lines and provide polarisation and radiation pattern diversity function due to the orthogonal placement of their feed lines. By inserting a rectangular slot under each microstrip feed‐line, the mutual coupling characteristic of the antenna ports is reduced. A good frequency bandwidth ( S 11 ≤ − 10 dB) of 3.3–3.9 GHz has been obtained for the smartphone antenna array. Nevertheless, for S 11 ≤ − 6 dB, this value is 3.1–4.3 GHz. More than 3 dB realised gain and 80% total efficiency are achieved for the single‐element radiator. The design provides not only sufficient radiation coverage supporting different sides of the mainboard but also the polarisation diversity. In addition, sufficient properties are obtained in the vicinity of human‐hand/human‐head. The proposed MIMO antenna design is also capable to generate dual‐ or multi‐band function. Moreover, a new and compact phased array millimeter‐wave (mm‐wave) antenna design with end‐fire radiation beams is introduced which can be easily integrated into smartphones.