This article presents a circularly polarized 4-port Multiple Inputs Multiple Outputs dielectric resonator-based antenna with two resonating bands for WLAN (5.0 GHz) and WiMAX (3.5 GHz) applications. Important attributes of proposed MIMO-DRA are: (i) Bandwidth enhancement is observed due to the use of ring-shaped ceramic material radiator; (ii) Incorporation of rectangular aperture lead to excite the dual hybrid mode in ring DRA, which helps to support dual-frequency range (iii) Circular polarization is achieved in both operating bands by conversion of rectangular to Z-shaped slot; and (iv) mutual coupling among port <−18 dB due to the use of space diversity. The fabricated prototype of the MIMO radiator is measured experimentally, which confirms the dual impedance bandwidth of 3.35 – 3.82 GHz and 5.09 – 5.41 GHz. The proposed antenna is right-handed circularly polarized (RHCP) within the frequency range of 3.54 – 3.72 GHz & 5.04 – 5.16 GHz respectively.

In this article, a novel configuration of ring dielectric resonator-based multiple input multiple output antenna (MIMO) is proposed with a beam tilting characteristic. To achieve the beam tilting and low correlation among the far-field patterns, the conducting plate is positioned in between the antenna elements. Dual resonating frequencies are obtained by exciting the ring DRA electromagnetically with a microstrip line via optimized double-ring loaded slots. All the ports are arranged in a parallel fashion. Port-1/port-2 is placed 180⁰ out of phase with port-3/port-4. The proposed antenna achieves the maximum beam tilting of 55⁰ and 35⁰ at 2.61 and 2.95 GHz, respectively. Polarization diversity is confirmed between oppositely oriented ports i.e. port-1/port-2 and port-4/port-3 by getting LHCP and RHCP patterns, respectively. The optimum value of diversity parameters of the proposed MIMO ring DRA makes it suitable for high-speed applications.