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Summary
This summary is machine-generated.

This study introduces a compact four-port multiple-input multiple-output (MIMO) antenna for Internet-of-Things (IoT) devices. The design uses a dual-polarized radiator and a defected ground structure to achieve high performance in a small size.

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Wireless Communications

Background:

  • Internet-of-Things (IoT) devices require increasingly compact antennas.
  • Scaling traditional single-polarized antennas for multi-port operation leads to larger sizes.
  • High channel capacity in IoT necessitates multi-port antenna systems like MIMO.

Purpose of the Study:

  • To develop a compact four-port multiple-input multiple-output (MIMO) antenna for IoT applications.
  • To achieve multi-port operation and high channel capacity in a reduced antenna footprint.
  • To minimize mutual coupling between antenna elements for improved isolation.

Main Methods:

  • Utilized a dual-polarized radiator instead of single-polarized elements to reduce size.
  • Incorporated an I-shaped defected ground structure (DGS) to mitigate mutual coupling.
  • Designed and measured a four-port MIMO antenna with specific dimensions at 5.5 GHz.

Main Results:

  • Achieved a compact antenna size of 0.92 λ× 0.73 λ× 0.03 λ at 5.5 GHz.
  • Obtained an operating bandwidth of approximately 2.2%.
  • Demonstrated isolation better than 20 dB and a peak gain exceeding 6.0 dBi.

Conclusions:

  • The proposed dual-polarized radiator and DGS approach enables compact, high-performance MIMO antennas for IoT.
  • The design effectively reduces mutual coupling, enhancing isolation between ports.
  • The method is scalable and applicable to larger MIMO arrays for future wireless systems.