Miniaturized Single Circular and Single Ring Patch Antenna for MIMO Communications Exploiting Pattern Diversity

This paper proposes an annular-ring microstrip antenna for a 2×2 MIMO communication system. A single annular-ring microstrip antenna with two feed probes is used to generate two orthogonal radiation patterns. Radiation pattern associated with each probe is generated by FEKO simulations and shown that the patterns are orthogonal to each other. Orthogonal radiation patterns are needed to exploit pattern diversity instead of space diversity. Miniaturization is achieved by using a ferrite substrate instead of using a pure dielectric substrate. A ferrite annular-ring antenna with a single feed probe was manufactured and tested. Also a ferrite single circular patch antenna was manufactured and measurement results are presented.