Abstract
A compact self-isolated Multi Input Multi Output (MIMO) antenna array is presented for 5G mobile phone devices. The proposed antenna system is operating at the 3.5 GHz band (3400–3600 MHz) and consists of eight antenna elements placed along two side edges of a mobile device, which meets the current trend requirements of full-screen smartphone devices. Each antenna element is divided into two parts, a front part and back part. The front part consists of an I-shaped feeding line and a modified Hilbert fractal monopole antenna, whereas the back part is an L-shaped element shorted to the system ground by a 0.5 mm short stub. A desirable compactness can be obtained by utilizing the Hilbert space-filling property where the antenna element’s overall planar size printed on the side-edge frame is just (9.57 mm × 5.99 mm). The proposed MIMO antenna system has been simulated, analyzed, fabricated and tested. Based on the self-isolated property, good isolation (better than 15 dB) is attained without employing additional decoupling elements and/or isolation techniques, which increases system complexity and reduces the antenna efficiency. The scattering parameters, antenna efficiencies, antenna gains, and antenna radiation characteristics are investigated to assess the proposed antenna performance. For evaluating the proposed antenna array system performance, the Envelope Correlation Coefficients (ECCs), Mean Effective Gains (MEGs) and channel capacity are calculated. Desirable antenna and MIMO performances are evaluated to confirm the suitability of the proposed MIMO antenna system for 5G mobile terminals.
Highlights
With increasing growth of wireless communication technologies, high data rates and intelligent services are being continuously demanded
A compact self-isolated Multi Input Multi Output (MIMO) antenna array is presented for 5G mobile phone devices
The proposed antenna system is operating at the 3.5 GHz band (3400–3600 MHz) and consists of eight antenna elements placed along two side edges of a mobile device, which meets the current trend requirements of full-screen smartphone devices
Summary
With increasing growth of wireless communication technologies, high data rates and intelligent services are being continuously demanded. Various techniques have been employed and provided reasonable solutions to solve this problem One of these techniques includes the spatial diversity method [4–6]. Many other isolation techniques using external decoupling structures have been reported in the literature including parasitic structure [11,12], hybrid elements (neutralization line and parasitic element) [13], neutralization line [14,15], decoupling network [16,17], slot etching [18], hybrid decoupling like ground slot etching and meandered line parasitic element [19] or ground slot and neutralization line [20], and multimode decoupling technique [21] These isolation techniques, which are based on additional decoupling structures, provide good isolation enhancement, the antenna efficiency might be reduced significantly. A compact-size massive MIMO antenna system with good isolation and high efficiency for 5G mobile devices is still a challenge
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
