DIELECTRIC RESONATOR ANTENNA DESIGN FOR MIMO-BASED WIRELESS COMMUNICATION SYSTEMS

Abstract

This work introduces a rack-shaped two-element dielectric resonator antenna (DRA) based multiple-input multiple-output (MIMO) system featuring improved axial ratio features for ultra-wideband (UWB) operations. The proposed antenna configuration employs two rectangular radiator elements modified into rack-shaped dielectric resonators to excite multiple resonant modes, namely ????????????₁₁₁, ????????????₁₂₁, and ????????????₂₁₂, at 7.3 GHz, 9.3 GHz, and 10.74 GHz, respectively. The rack-based configuration markedly enhances the bandwidth effectiveness over the UWB wavelength spectrum. An inverted T-shaped magnetic strip is employed to attain elliptical polarisation while efficiently regulating both axial ratio spectrum & susceptibility spectrum, yielding a broad impedance spectrum of 101.87%. Simulated & measured outcomes demonstrate strong concordance and validate UWB functionality from 3.54 to 10.89 GHz. The MIMO effectiveness is assessed based on the envelope correlation ratio (ECC ≤ 0.0059), broadness gain (DG ≥ 9.93 dB), total reflection active coefficient (TARC) across various phases positions, grouping delay (ranging from 0.96 to −2.1 ns), and channel capability loss (CCL ≤ 0.4 bits/s/Hz, excluding the 8.8–9.6 GHz band). The outcomes demonstrate that the suggested transmitter meets typical MIMO requirements and is appropriate for high-data-rate uses within the C- & X-band spectrum categories.