Coupling Reduction of Extremely Closely Spaced Circularly Polarized MIMO Patch Antenna by Phase Shift Method

IEEE Access - 2023
Huy-Hung Tran1,2, Tung The-Lam Nguyen3, Hoai-Nam Ta4, Duy-Phong Pham5
1Phenikaa Research and Technology Institute (PRATI), Hanoi, Vietnam
2Faculty of Electrical and Electronic Engineering, Phenikaa University, Hanoi, Vietnam
3IT Department, FPT University, Greenwich Vietnam, Hanoi, Vietnam
4Faculty of Radio Electronics Engineering, Le Quy Don Technical University, Hanoi, Vietnam
5Faculty of Electronics and Telecommunications, Electric Power University, Hanoi, Vietnam

Tóm tắt

This paper shows a method to reduce the mutual coupling between extremely closely spaced circularly polarized (CP) multiple-input-multiple-output (MIMO) antenna. The strong coupling between dual-sense CP MIMO elements is thoroughly investigated and a method to effectively suppress the mutual coupling by controlling the phase of the coupled signal is proposed. High isolation can be achieved by using a grounded stub, which is positioned along the edges of radiating elements. An antenna prototype is fabricated and measured to verify the feasibility of the utilized decoupling scheme. The measured results show an operating bandwidth of 2.1% (5.21-5.32 GHz) with isolation of better than 20 dB. The poor isolation of the coupled MIMO is significantly enhanced to 38 dB with the use of the proposed decoupling network. A 33 dB improvement can be attained with an extremely small edge-to-edge distance of $0.017\lambda _{c}$ and center-to-center spacing of $0.23\lambda _{c}$ at the center frequency. Compared to other related works, the proposed antenna features the smallest element spacing while achieving high isolation enhancement.

Từ khóa

#Circularly polarized #high isolation #grounded stub #microstrip patch #MIMO

Tài liệu tham khảo

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