A Wideband And High-Isolation Mimo Antenna With Hybrid Magnetic-Electric Coupling Loop

In this paper, a hybrid magnetic-electric coupling loop MIMO antenna is proposed toimplement wireless communication. The proposed radiated element consists of three split rings,i.e., the feeding ring, the main radiated ring, and the parasitic ring. In virtue of hybrid magnetic-electric coupling between the three split rings, a wide frequency band (2.2 GHz - 4.7 GHz), compact size (50 mm $\times50.7$ mm) can be achieved by a single antenna. After that, a MIMO antenna consisting of four radiators is constructed and the distance between the nearest elements is only 5 mm. The minimum electrical length is λ0 (λ0 is the wavelength of the lowest resonance). Without any decoupling structures, the proposed MIMO antenna not only canachieve a very wide bandwidth but also a high degree of isolation (i.e., less than -12 dB).