A Compact Wideband Circularly Polarized High Isolation X-Band MIMO Dielectric Resonator Antenna

This study paper presents a compact MIMO Dielectric Resonator Antenna designed for X-band communication. The antenna operates in the 8–15 GHz frequency range and exhibits circular polarization with a wideband characteristics. High isolation, below −20 dB, is achieved across the entire band by introducing a ground plane defect. The novel DRA consists of two stacked layers separated by an air gap to improve bandwidth. Circular polarization is achieved by feeding the dielectric resonators (DR) with orthogonal microstrip lines. This study explores the innovative integration of perforations into dielectric resonator antennas for MIMO applications. By investigating the effects of perforations on radiation characteristics and isolation properties, we aim to contribute to developing efficient and high-performance MIMO antenna systems, which are pivotal for meeting the ever-increasing demands of modern wireless communication technologies. Performance evaluation reveals a 72% complete overlap of 10 dB impedance bandwidth and 3 dB AR bandwidth. The proposed compact MIMO DRA offers the advantage of high isolation below −20 dB, a wide bandwidth of 72%, and circular polarization for X-band communication applications with complete overlap of 72%.