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A Four-Port MIMO Cylindrical DRA with High Isolation in Ultra-Compact Size for WLAN Applications.
Xue-Ping Li1,2,3, Jun-Fei Ji1, Chang-Jiao Duan1
1College of Electronic and Electrical Engineering, Henan Normal University, Xinxiang 453600, China.
Micromachines
|September 28, 2023
Summary
This study presents an ultra-compact four-port multiple-input-multiple-output (MIMO) dielectric resonator antenna (DRA) for WLAN. A novel U-shaped slot significantly enhances port isolation, improving antenna performance.
Area of Science:
- Electromagnetics and Antenna Design
- Wireless Communication Systems
- Microwave Engineering
Background:
- Multiple-Input-Multiple-Output (MIMO) technology is crucial for enhancing wireless communication performance.
- Dielectric Resonator Antennas (DRAs) offer advantages like small size and high efficiency.
- Achieving high isolation in compact multi-port antennas remains a significant challenge.
Purpose of the Study:
- To propose and validate a novel ultra-compact four-port MIMO cylindrical DRA with improved isolation for WLAN applications.
- To introduce a decoupling mechanism utilizing a U-shaped slot on the ground plane.
- To analyze the antenna's performance using common mode (CM) and differential mode (DM) impedance analysis.
Main Methods:
- Design and simulation of a four-port cylindrical DRA.
- Incorporation of a U-shaped slot and rectangular slits for isolation and impedance matching.
- Fabrication and experimental testing of the proposed antenna.
- Analysis of common mode (CM) and differential mode (DM) impedance characteristics.
Main Results:
- Significant enhancement in isolation between port 1 and port 2, from 5 dB to 23 dB.
- Low coupling (< 12 dB) achieved for other ports.
- Demonstrated bandwidth of 300 MHz for the four-port configuration and 700 MHz for the two-port configuration at 5.6 GHz.
- Validation of the decoupling mechanism through simulation and experimental results.
Conclusions:
- The proposed U-shaped slot effectively suppresses coupling between DRA ports, significantly improving isolation.
- The ultra-compact four-port MIMO DRA meets the requirements for WLAN applications.
- The design offers flexibility for use as either a four-port or two-port antenna with considerable bandwidth.
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