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Updated: Jun 29, 2025
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.5K
Mitigating mutual coupling effects on circular polarization for improved bandwidth in MIMO systems: A novel approach
A Ali1, M N M Yasin1,2, I Adam1,2
1Advance Communication Engineering (ACE), Centre of Excellence, Universiti Malaysia Perlis (UniMAP), Kangar, Perlis, 01000, Malaysia.
Heliyon
|March 25, 2024
Summary
This study presents an improved circularly polarized multi-input multi-output dielectric resonator antenna that significantly reduces mutual coupling using a trimming approach, enhancing signal reception for MIMO applications.
Area of Science:
- Electromagnetics and Antennas
- Wireless Communication Systems
- Microwave Engineering
Background:
- Mutual coupling (MC) in closely spaced antenna elements degrades MIMO system performance.
- Circularly polarized (CP) antennas are crucial for mitigating polarization mismatch losses.
- Dielectric Resonator Antennas (DRAs) offer advantages in size and performance for various applications.
Purpose of the Study:
- To develop an improved compensation technique for mutual coupling in CP MIMO DRAs.
- To maintain excellent axial ratio (AR) performance while reducing MC.
- To achieve wide impedance bandwidth and triple-band circular polarization.
Main Methods:
- A trimming approach was employed to reduce mutual coupling between DRA units.
- Characteristic Mode Analysis (CMA) was used for antenna design and optimization.
- Probe feed method coupled with a patch strip was utilized for bandwidth enhancement.
- MIMO performance was verified using metrics like diversity gain and channel capacity loss.
Main Results:
- Mutual coupling was significantly reduced to below -20 dB.
- Wide impedance matching bandwidth (BW) was achieved, ranging from 34% to 2%.
- Triple-band 3 dB AR bandwidths were observed at 3.3 GHz (11.66%), 4.6 GHz (3.04%), and 6.3 GHz (2.22%).
- Simulated and measured results showed good agreement, validating the antenna's performance.
Conclusions:
- The proposed trimming approach effectively suppresses mutual coupling in CP MIMO DRAs.
- The designed antenna exhibits desirable features including wide BW, triple-band CP, and low MC.
- The validated MIMO performance metrics confirm its suitability for enhanced signal reception.
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