Mutual Coupling Reduction through Defected Ground Structure in Circularly Polarized, Dielectric Resonator-Based MIMO...

Area of Science:

• Electrical Engineering
• Electromagnetics
• Antenna Theory

Background:

• The demand for high-performance antennas in wireless communication systems, particularly for 5G Sub 6 GHz applications, is rapidly increasing.
• Existing antenna designs often face challenges in achieving wide bandwidth, circular polarization, and high isolation simultaneously.
• Multiple-Input Multiple-Output (MIMO) systems require antennas with excellent isolation characteristics to maximize data throughput.

Purpose of the Study:

• To design and demonstrate a singly-fed circularly polarized rectangular dielectric resonator antenna (RDRA).
• To enhance antenna performance for Multiple-Input Multiple-Output (MIMO) and 5G Sub 6 GHz applications.
• To achieve wide impedance bandwidth, good axial ratio, and high port-to-port isolation.

Main Methods:

• A novel-shaped conformal metal strip was employed to achieve circular polarization for both antenna ports.
• An "S" shaped defective ground plane structure (DGPS) was integrated to improve isolation between radiating elements.
• A prototype antenna was fabricated and experimentally validated to verify simulation results.

Main Results:

• The proposed RDRA achieved a fractional impedance bandwidth of 36.63% over the 3.57–4.48 GHz frequency range.
• A parallel axial ratio bandwidth of 28.33% was obtained, correlating with the impedance matching bandwidth.
• High port-to-port isolation of -28 dB was achieved, alongside optimal gain and other far-field parameters.

Conclusions:

• The developed RDRA effectively meets the stringent requirements for 5G Sub 6 GHz MIMO applications.
• The novel design incorporating a conformal metal strip and DGPS offers a promising solution for high-performance wireless communication.
• Experimental validation confirms the antenna's capability to deliver wide bandwidth, circular polarization, and excellent isolation.