Compact Rack Shaped MIMO Dielectric Resonator Antenna with Improved Axial Ratio for UWB Applications

In this paper, a rack shaped two radiator element multiple input multiple output (MIMO) dielectric resonator antenna (DRA) is reported with improved axial ratio (AR) characteristics for ultra-wideband applications. The proposed MIMO antenna structure is implemented with the help of two rectangular shaped radiator elements which are further changed into rack shaped dielectric resonator (DR) that support three modes HEM₁₁₁, HEM₁₂₁, and HEM₂₁₂, at 7.3, 9.3, 10.74 GHz respectively. The approach of rack shaped DRA has improved the transmission coefficient for the UWB range. Inverted T-shaped metallic strip apart from giving elliptically polarized (EP) characteristics also helps in controlling both the axial ratio bandwidth and impedance bandwidth (101.87%). The simulated and measured outcomes validated that the proposed antenna can be utilized for 3.54–10.89 GHz ultra-wideband (UWB) frequency range. The MIMO diversity parameters are implemented as ECC ≤ 0.0059, DG ≥ 9.93 dB, TARC (0, 30, 60, 90, 120, 150, and 180) degrees, GD (0.96 to − 2.1 ns) and CCL (≤ 0.4 except of 8.8–9.6 GHz). All the obtained MIMO antenna parameters are within the acceptable limit and also provides high data rate applications in C and X bands.