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High isolation MIMO antenna based on metasurface for linear-circular polarization conversion and decoupling.

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This study introduces a multi-layer metasurface for antenna arrays, achieving efficient linear-to-circular polarization conversion and superior element decoupling. The design enhances antenna performance in the sub-6 GHz band.

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Area of Science:

  • Electromagnetics and Metamaterials
  • Antenna Engineering
  • Microwave Engineering

Background:

  • Antenna arrays often suffer from inter-element coupling, degrading performance.
  • Achieving simultaneous polarization conversion and decoupling in antenna systems is challenging.
  • Metasurfaces offer novel solutions for electromagnetic wave manipulation.

Purpose of the Study:

  • To propose a multi-layer metasurface (MTS) design for a 3x3 antenna array.
  • To achieve simultaneous linear-to-circular (LTC) polarization conversion and element decoupling.
  • To operate efficiently within the sub-6 GHz frequency band.

Main Methods:

  • Optimized the design of a multi-layer metasurface structure.
  • Integrated the MTS with a 3x3 antenna array operating in the sub-6 GHz band.
  • Analyzed the performance in terms of isolation, axial ratio, and bandwidth.

Main Results:

  • Achieved isolation greater than 20 dB, suppressing inter-element coupling.
  • Efficiently converted linearly polarized (LP) signals to circularly polarized (CP) signals with an axial ratio (AR) below 3 dB.
  • Obtained a relative bandwidth (BW) of 3.5% for the proposed antenna array with MTS.

Conclusions:

  • The proposed MTS effectively enables simultaneous LTC polarization conversion and decoupling for antenna arrays.
  • The design demonstrates scalability for larger antenna arrays due to its periodic structure.
  • This integrated approach enhances antenna performance in terms of polarization purity and isolation.