Pattern Diversity Based Double Sided Dielectric Resonator Antenna for MIMO Applications

This paper explains a double sided dielectric resonator antenna (DRA) for multiple-input-multiple-output (MIMO) applications which supported pattern diversity characteristics. The unique feature of the proposed MIMO antenna is that it supports back to back rectangular DRA (rDRA) orientation with single common ground plane. The antenna is a four port MIMO antenna since each rDRA is excited by two ports. The rDRAs are positioned at different sides of the substrate. To excite the top rDRA, co-planar waveguide (CPW) fed conformal strip line is used at port-1 and port-2. Similarly, microstrip line fed conformal strip line is used in case of port-3 and port-4 to excite the bottom rDRA. By exciting orthogonal mode in the rDRA, the isolation between port [1], [2] and [3], [4] has been enhanced. Similarly, isolation level between ports [1], [3], [1], [4], [2], [3] and [2], [4] has been improved (better than 20 dB) by exciting the rDRA in opposite direction.