Dielectric resonator‐based two‐element MIMO antenna system with dual band characteristics

Abstract

In this research article, a dielectric resonator-based multiple input multiple output (MIMO) antenna system is presented with dual band characteristics. The proposed MIMO antenna includes two symmetrical hybrid radiators. Each hybrid radiator consists of a modified annular ring printed line along with a cylindrical dielectric resonator antenna (CDRA). A modified annular ring printed line acts as a magnetic dipole and creates two different radiating modes (HEM11δ and TE01δ) in the dielectric resonator. The approach of the hybrid antenna (combination of the modified annular ring printed line and CDRA) is taken into account for achieving dual band characteristics. Orthogonally placed antenna elements and a narrow slit in the ground plane are used to improve isolation (|S12| < −20 dB) in the entire operating frequency range. The antenna prototype is fabricated and measured for validating the simulated results. The proposed MIMO radiator is operating over two frequency bands, i.e. 1.75–2.4 and 3.5–5.5 GHz. Different MIMO diversity performance parameters (envelope correlation coefficient, diversity gain, mean effective gain, total active reflection coefficient, and channel capacity loss) are also inspected and found within acceptable limits.