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Self-isolated MIMO antenna using mixed coupling by close coupling technique.

Harsh Verdhan Singh1, D Venkata Siva Prasad2, Shrivishal Tripathi2

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A novel M-pattern multiple-input-multiple-output (MIMO) antenna design achieves high isolation for 5G systems without extra decoupling structures. This self-isolating antenna offers scalable solutions for advanced wireless communication bands.

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Area of Science:

  • Electrical Engineering
  • Antenna Theory and Design
  • Wireless Communications

Background:

  • High isolation is crucial for multiple-input-multiple-output (MIMO) antenna performance in 5G systems.
  • Existing decoupling techniques often increase antenna size and complexity.
  • Compact, self-isolating antenna solutions are needed for next-generation wireless devices.

Purpose of the Study:

  • To propose and validate a self-isolated MIMO antenna using a compact shared ground structure.
  • To demonstrate the effectiveness of M-pattern antenna elements in achieving high isolation.
  • To investigate the scalability of the proposed design for higher-order MIMO systems.

Main Methods:

  • Design of a novel M-pattern antenna configuration with closely coupled members.
  • Analysis of electric and magnetic coupling, and surface currents for isolation enhancement.
  • Development of a matching circuit model to explain the isolation principle.
  • Fabrication and simulation of 2-member and 8-member MIMO antenna prototypes.
  • Measurement of isolation performance in 5G NR and LTE frequency bands.

Main Results:

  • The 2-member M-pattern MIMO antenna achieved over 15 dB isolation in 5G NR (n48/n78) and LTE (42/43/48/52) bands (3.2-3.98 GHz).
  • The M-pattern element design effectively cancels coupling, enabling self-isolation.
  • The 8-member M-pattern MIMO antenna demonstrated over 20 dB isolation in 5G NR (n48) and LTE (42/43/52) bands (3.29-3.66 GHz).

Conclusions:

  • The proposed M-pattern MIMO antenna offers a compact and effective solution for high isolation in 5G applications.
  • The design's scalability allows for higher-order MIMO configurations.
  • This self-isolating antenna technology minimizes the need for external decoupling circuits, simplifying system integration.