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Area of Science:

  • Electromagnetics and Antenna Engineering
  • Wireless Communication Systems

Background:

  • Multiple-Input-Multiple-Output (MIMO) antenna systems are crucial for modern wireless communication.
  • Achieving high isolation in compact MIMO arrays with small element spacing remains a significant challenge.

Purpose of the Study:

  • To propose and validate a novel decoupling technique for low-profile MIMO antenna systems.
  • To demonstrate the feasibility of achieving high isolation in closely spaced antenna elements.

Main Methods:

  • Utilizing orthogonal operating modes to suppress mutual coupling between MIMO elements.
  • Employing a half-wavelength microstrip line and a quarter-wavelength grounded stub for decoupling.
  • Fabricating and measuring a 2x2 antenna prototype.

Main Results:

  • Demonstrated effective decoupling of E-plane and H-plane MIMO arrays.
  • Achieved isolation greater than 15 dB with very small element spacing (0.032λ and 0.026λ).
  • Measured impedance bandwidth from 4.78 to 4.81 GHz.

Conclusions:

  • The proposed simple decoupling structure effectively suppresses coupling in compact MIMO antennas.
  • The antenna is suitable for 5G Internet of Things (IoT) applications, particularly in the N79 band.
  • The design is scalable to larger 2xN arrays.