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Frequency-Selective Surface-Based MIMO Antenna Array for 5G Millimeter-Wave Applications.

Iftikhar Ud Din1, Mohammad Alibakhshikenari2, Bal S Virdee3

  • 1Telecommunication Engineering Department, University of Engineering and Technology, Mardan 23200, Pakistan.

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Summary
This summary is machine-generated.

This study introduces a novel MIMO antenna array for 5G millimeter-wave applications, achieving high gain and isolation. The design minimizes mutual coupling for improved 5G system performance.

Keywords:
MIMO antennafifth generation (5G)frequency-selective surfacemillimeter-wave (mm wave) regionmutual coupling reductionwide bandwidth

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Wireless Communications

Background:

  • Millimeter-wave (mmWave) frequencies are crucial for 5G, presenting challenges in antenna design due to high path loss and component sensitivity.
  • Mutual coupling in Multiple-Input Multiple-Output (MIMO) antenna arrays can significantly degrade system performance, particularly at higher frequencies.

Purpose of the Study:

  • To propose and validate a modified circular patch radiating element for 2x2 MIMO arrays tailored for 5G mmWave applications.
  • To mitigate mutual coupling between antenna elements and enhance overall array performance, including gain and isolation.
  • To investigate the impact of a Frequency Selective Surface (FSS) on the MIMO array's gain.

Main Methods:

  • Design and fabrication of a 2x2 MIMO antenna array using a modified circular patch element on a high-frequency substrate (Rogers RT/Duroid).
  • Orthogonal configuration of radiating elements to reduce mutual coupling.
  • Integration of a 7x7 Freqency Selective Surface (FSS) with C-shaped resonators to enhance gain.

Main Results:

  • The individual antenna elements achieved a measured impedance bandwidth of 1.6 GHz (27.25–28.85 GHz) for S11 ≤ -10 dB.
  • The MIMO array demonstrated a gain of 7.2 dBi and isolation greater than 26 dB at 28 GHz.
  • Incorporating the FSS increased the MIMO array's gain to 8.6 dBi at 28 GHz, with directional radiation perpendicular to the array plane.

Conclusions:

  • The proposed modified circular patch element and orthogonal configuration effectively mitigate mutual coupling in 5G mmWave MIMO arrays.
  • The FSS integration significantly boosts the array's gain, making it suitable for demanding 5G applications.
  • The array exhibits excellent performance metrics, including low Envelope Correlation Coefficient (<0.002) and high Diversity Gain (>9.99 dB) within the 28 GHz 5G band.