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A Compact High-Isolation Four-Element MIMO Antenna with Asymptote-Shaped Structure.

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This study introduces a compact, high-performance four-port ultrawide-band (UWB) multiple-input multiple-output (MIMO) antenna. Its novel design offers excellent performance trade-offs, making it ideal for 5G and future wireless devices.

Keywords:
UWB antennaasymptote-shapedhigh isolationmultiple-input multiple-outputpolarization diversity

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Wireless Communication

Background:

  • The increasing demand for high-speed wireless communication necessitates compact, high-performance antennas.
  • Existing ultrawide-band (UWB) antenna designs often face limitations in size and performance trade-offs.
  • Multiple-input multiple-output (MIMO) technology is crucial for enhancing wireless system capacity and reliability.

Purpose of the Study:

  • To propose and validate a novel four-port UWB MIMO antenna with a compact, asymptote-shaped structure.
  • To achieve a superior balance of bandwidth, size, isolation, and other performance metrics for UWB applications.
  • To enhance polarization diversity and inter-element isolation using parasitic decoupling structures.

Main Methods:

  • Design and simulation of a four-port MIMO antenna with orthogonal elements and stepped rectangular patches.
  • Integration of parasitic decoupling tapes (windmill and rotating extended cross shapes) on the ground plane.
  • Fabrication on a single-layer FR4 substrate and experimental measurement of antenna parameters.
  • Analysis of impedance bandwidth, isolation, envelope correlation coefficient (ECC), diversity gain (DG), total average TARC, group delay, and gain.

Main Results:

  • The proposed antenna achieved a compact size of 42 × 42 mm².
  • Measured impedance bandwidth from 3.09-12 GHz with excellent isolation (-16.4 dB) and low ECC (0.02).
  • Demonstrated strong diversity performance with DG of 9.991 dB and TARC of -20 dB, alongside a peak gain of 5.1 dBi.

Conclusions:

  • The novel asymptote-shaped UWB MIMO antenna offers an excellent trade-off between size, bandwidth, and isolation.
  • The parasitic decoupling tapes effectively improved isolation between antenna elements.
  • The antenna's performance makes it a promising candidate for 5G and next-generation wireless communication systems, especially in space-constrained devices.