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

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 couplin...

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Bibliographic Details
Published in:IEEE access 2023-01, Vol.11, p.1-1
Main Authors: Tran, Huy-Hung, Nguyen, Tung The-Lam, Ta, Hoai-Nam, Pham, Duy-Phong
Format: Article
Language:English
Subjects:
Antenna measurements
Antennas
Circular polarization
Circularly polarized
Couplings
Decoupling
Gain
grounded stub
high isolation
microstrip patch
MIMO
MIMO communication
Mutual coupling
Patch antennas
Scattering parameters
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Summary: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 0.017λ c and center-to-center spacing of 0.23λ c at the center frequency. Compared to other related works, the proposed antenna features the smallest element spacing while achieving high isolation enhancement.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2023.3289840