| Compact Dual-Band MIMO Antenna with Complementary Isotropic Open Resonant Ring for Mutual Coupling Reduction |
Xuemei Zheng1 
, Ziwei Zhao2
, Yuwen Pan3
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1KeyLaboratory of Modern Power System Simulation and Control and Renewable Energy Technology, Ministry of Education, School of Electrical Engineering, Northeast Electric Power University, Jilin, China
2School of Electrical Engineering, Northeast Electric Power University, Jilin, China
3Sainty-Tech Communications Ltd., Nanjing, China |
Correspondence:
Xuemei Zheng,Email: zhengxuemei@neepu.edu.cn
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Received: 9 November 2024 • Revised: 16 February 2025 • Accepted: 9 May 2025 |
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| Abstract |
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In this study, a compact dual-band multiple-input multiple-output (MIMO) antenna system loaded with a complementary isotropic open resonant ring is proposed for WLAN and 5G Wi-Fi applications. The proposed antenna system consists of simple rectangular patches arranged symmetrically, with power fed diagonally in coaxial mode to obtain two different resonance modes at 3.5 GHz and 5.3 GHz. Furthermore, the proposed complementary open resonant ring structure, composed of a square ring and a circular ring arranged as a coplanar waveguide in the form of 1 × 3, is placed between two patch units to improve the isolation of the dual-band antenna. The measured results show that the proposed MIMO antenna system achieves S11 < -10 dB at the two frequency bands of 3.46–3.56 GHz and 5.22–5.41 GHz, while the measured isolation between the two antenna units is significantly improved by 6.16 dB and 3.62 dB, respectively, at the two frequency bands compared to an antenna without metamaterials. In addition, the envelope correlation coefficient values of the MIMO antenna arrays in the two operating frequency bands are less than 0.02, indicating a good diversity gain that meets the diversity requirements of MIMO antenna systems for practical applications. This further implies that the dual-frequency MIMO antenna system offers good isolation performance in both high- and low-frequency bands. The simulation and measurement results also exhibit good consistency. Overall, it is established that the proposed antenna structure can be applied to the field of miniaturized MIMO antenna arrays in dual-frequency bands. |
| Key words:
Complementary Isotropic Open Resonant Ring, Diversity Gain, Dual-Band, Envelope Correlation Coefficient, Isolation, Low Coupling, MIMO |
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