MIMO Dielectric Resonator Antenna with Multiple Diversity Techniques

In this article, a five-port multiple-input-multiple-output (MIMO) dielectric resonator antenna (DRA) is investigated for WLAN applications. Four cylindrical dielectric resonator antennas (CDRAs) are positioned at the four different arms of a plus shaped substrate. The coaxial feed excites
$HE_{11\delta}$
mode in each CDRA. The antennas are arranged in such a manner that polarization and space diversity are established in between the antenna elements to improve the isolation between the ports. Pattern diversity is created in the proposed geometry by exciting another mode
$(\mathbf{TM}_{\mathbf{01}{\delta}})$
in the ring DRA. The ring DRA is placed at the center of the substrate. With this multiple diversity technique, more than 24 dB of isolation is achieved among the ports. The proposed antenna structure offers 10.16% of bandwidth covering band from 5.51 to 6.10 GHz. Based on the presented results, the proposed MIMO antenna may be suitable for WLAN 5.8GHz applications.