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MIMO Antenna Mutual Coupling Reduction Using Modified Inverted-Fork Shaped Structure
  • Jogesh Chandra Dash ,
  • Shilpa Kharche ,
  • G Shrikanth Reddy
Jogesh Chandra Dash
Indian Institute of Science

Corresponding Author:[email protected]

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Shilpa Kharche
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G Shrikanth Reddy
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Abstract

This paper presents, a mutual coupling reduction technique between a very closely spaced (1.8 mm) two-element microstrip based MIMO antennas using a modified inverted-fork shaped decoupling (m-IFSD) structure. The m-IFSD consists of an inverted fork and a cross shaped structure with a shorted via. The combined effect of inverted-fork and shorted cross shaped structure results in mutual coupling reduction below −35 dB between adjacent antenna elements. The decoupling technique is analyzed using an approximate transmission-line model and field distribution. Further, the two-element MIMO antenna design is extended to 8-element MIMO configuration to improve the MIMO diversity. To verify the proposed isolation technique a two-element MIMO antenna prototype is fabricated and measured. The proposed MIMO antenna exhibits a low mutual coupling (< −35 dB) with good impedance matching (< −10 dB) at 5.45 GHz. The MIMO antenna provided a total active reflection coefficient (TARC) less than −10 dB and envelop correlation coefficient (ECC) (for isotropic propagation scenario) less than 0.5. Finally, the ECC of the proposed MIMO antenna system is analyzed for a realistic Gaussian/Uniform propagation scenario for various incidence angles and angular spreads to better understand the effect of the mutual coupling reduction technique.
2022Published in IEEE Canadian Journal of Electrical and Computer Engineering volume 45 issue 4 on pages 375-382. 10.1109/ICJECE.2022.3201054