A Compact Circularly Polarized MIMO Dielectric Resonator Antenna Over Electromagnetic Band-Gap Surface for 5G Applications

Abstract

We present a wideband circularly polarized (CP) multiple-input multiple-output (MIMO) dielectric resonator antenna (DRA) with enhanced diversity. In the DRA element, two diagonal edges of the DR were truncated at 45 • to obtain a wider axial ratio larger than 0.65 GHz. The DRA element was excited by a cross-ring slot with specific slot-arm ratio through microstrip-line (MSTL) implemented at the backside of the FR4 substrate to generate CP fields. Small triangular stands at the edge of the DR were employed to hold it in place to avoid any degradation from the uncontrollable bonding agent used for attaching DR onto the FR4 substrate. The DRA achieved an impedance bandwidth better than 0.8 GHz with an antenna gain of 4.83 dBi. Using the DRA with the MSTL feed, two-element CP-DRA array was implemented with electromagnetic band-gap (EBG) structure etched onto the ground plane of the MSTL. The proposed architecture achieves isolation better than 26 dB over the desired frequency band without any performance degradation while maintaining its compact size in the array. Various diversity analysis was carried out on the implemented circularly polarized MIMO DRA. The measured results demonstrated that the proposed singly fed DRA with EBG on the ground plate is suitable for implementing wideband circular polarized MIMO antennas in a compact size.INDEX TERMS Dielectric resonator antennas, electromagnetic band-gap, MIMO, mutual coupling.

Metasurface-Based Single-Layer Wideband Circularly Polarized MIMO Antenna for 5G Millimeter-Wave Systems

“…The array antennas provide high gain to increase signal strength but have the same channel capacity as a single antenna (being fed with the single port) and are suffering from power losses in complex power divider networks [13][14]. Dielectric resonator antennas (DRAs) are used to avoid the ohmic losses in conductors in mm-waves [15][16][17]. Compared to the DRAs in microwave frequencies, the size of the mm-wave DRA is very small, therefore the practical realization is the main concern.…”

Neutralization Line Decoupling Tri-Band Multiple-Input Multiple-Output Antenna Design

“…gap structure is used to reduce the coupling between the MIMO antenna elements [5]- [7], but some structures are complicated and difficult to fabricate. Defected ground structure can effectively improve the isolation of the multi-band MIMO antenna [8]- [12].…”

Dual‐band circularly polarized MIMO DRA for sub‐6 GHz applications

“…But advantages of CP in antennas swerved the researchers toward new domain of circularly polarized MIMO DRA. Very few articles 12‐18 have been reported in this domain. In Reference 12 the authors have proposed dual polarized triple band (2.21‐3.13, 3.40‐3.92, and 5.30‐6.10 GHz) MIMO DRA for WLAN/WiMAX applications.…”

“…In Reference 16, a hybrid technique has been employed using a parasitic patch at an optimized distance beside the conformal metal strip of the two identical rectangular DRAs in order to generate CP wave. In Reference 17 two‐element CP‐DRA array has been implemented with electromagnetic band‐gap (EBG) structure etched into the ground plane of the microstrip patch transmission line. In the best knowledge of authors, no work is reported related to dual‐element, dual‐band DRA based MIMO antenna with CP in both the operating bands.…”