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<p>Single-element antennas suffer from low data rates and poor multipath performance, making them unsuitable for modern high-speed communication systems. Multiple-input multiple-output (MIMO) technology overcomes these limitations by offering spatial diversity and higher channel capacity, however, its performance is often degraded by mutual coupling among closely spaced elements. To mitigate this issue, this paper presents a hybrid decoupling technique integrating a quad-arm parasitic patch with a cross-shaped defected ground structure (DGS) to suppress both surface-wave and near-field coupling in a compact four-element dual-band MIMO antenna. A coaxial-fed dual-band antenna is first designed using a modified rectangular patch with truncated and circular geometries and then extended into a four-element MIMO array. The design achieves impedance bandwidths of 8.3% and 6.7% at 2.45&#xa0;GHz and 4.49&#xa0;GHz, respectively, with isolation improved from − 20 dB to − 40 dB using the proposed technique. Broadside radiation is maintained with peak gains of 6.12 dBi and 5.7 dBi, 95% efficiency, and strong agreement between measured and simulated results. Furthermore, the MIMO antenna exhibits outstanding diversity performance, with an envelope correlation coefficient (ECC) below 0.001 and a diversity gain (DG) of 9.99 dB. The compact structure (1.22 λ₀ × 1.22 λ₀ × 0.018 λ₀), high isolation, and strong diversity parameters confirm its suitability for ISM and sub-6&#xa0;GHz MIMO communication systems.</p>

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Hybrid Electromagnetic Decoupling-Based Isolation Enhanced Compact MIMO Antenna for ISM-Band Wireless Systems

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Fatima Younis,
  • Adamu Halilu Jabire,
  • Jawad Ahmad,
  • Owais Khan,
  • Muhammad Javed Qasim,
  • Sonia Mustafa,
  • Heng Luo,
  • Shiliang Wang

摘要

Single-element antennas suffer from low data rates and poor multipath performance, making them unsuitable for modern high-speed communication systems. Multiple-input multiple-output (MIMO) technology overcomes these limitations by offering spatial diversity and higher channel capacity, however, its performance is often degraded by mutual coupling among closely spaced elements. To mitigate this issue, this paper presents a hybrid decoupling technique integrating a quad-arm parasitic patch with a cross-shaped defected ground structure (DGS) to suppress both surface-wave and near-field coupling in a compact four-element dual-band MIMO antenna. A coaxial-fed dual-band antenna is first designed using a modified rectangular patch with truncated and circular geometries and then extended into a four-element MIMO array. The design achieves impedance bandwidths of 8.3% and 6.7% at 2.45 GHz and 4.49 GHz, respectively, with isolation improved from − 20 dB to − 40 dB using the proposed technique. Broadside radiation is maintained with peak gains of 6.12 dBi and 5.7 dBi, 95% efficiency, and strong agreement between measured and simulated results. Furthermore, the MIMO antenna exhibits outstanding diversity performance, with an envelope correlation coefficient (ECC) below 0.001 and a diversity gain (DG) of 9.99 dB. The compact structure (1.22 λ₀ × 1.22 λ₀ × 0.018 λ₀), high isolation, and strong diversity parameters confirm its suitability for ISM and sub-6 GHz MIMO communication systems.