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<p>This research explores a compact dual-port wideband multiple-input multiple-output (MIMO) antenna with enhanced isolation, fabricated on a non-conventional 1.5&#xa0;mm thick colored resin fiber substrate, whose measured average dielectric constant and loss tangent are 1.79 and 0.055, respectively. The low dielectric constant of the substrate facilitates improved impedance bandwidth of the proposed design. An inverted trapezoidal-shaped ground slot and a neutralization line are integrated into the proposed antenna layout for isolation enhancement. The developed antenna offers a wide spectral range from 3.12 to 9.4&#xa0;GHz with 100.32% fractional bandwidth that encompasses WiMAX (3.2–3.8&#xa0;GHz), WLAN (5.15–5.35/5.725–5.825&#xa0;GHz), C-band downlink/uplink (3.7–4.2/5.925–6.425&#xa0;GHz), downlink defense (7.2–7.7&#xa0;GHz), and ITU band (8–8.5&#xa0;GHz). Across the working band, the proposed antenna demonstrates an isolation level above 26 dB and commendable diversity characteristics, including a lower envelope correlation coefficient (&lt; 0.076), higher diversity gain (&gt; 9.96 dB), minimal channel capacity loss (&lt; 0.34 Bits/Sec/Hz), negligible magnitude of mean effective gain ratio between antenna ports (&lt; 0.05 dB), and a robust total active reflection coefficient. The antenna achieves a maximum gain of 4.53 dBi with a radiation efficiency exceeding 81% over the operating band. For more detailed analytical insight, the equivalent circuit model for the proposed antenna is also implemented. The antenna also exhibits favorable time-domain properties over the operating band, ensuring its wideband operation capability. The alignment between simulated and measured findings is found in a well-matched condition.</p>

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Neutralization Line Loaded Dual Port Wideband MIMO Antenna with Enhanced Isolation Implemented on Colored Resin Fiber Material

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Raju Pandey,
  • Ashim Kumar Biswas,
  • Ujjal Chakraborty,
  • Amit Roy

摘要

This research explores a compact dual-port wideband multiple-input multiple-output (MIMO) antenna with enhanced isolation, fabricated on a non-conventional 1.5 mm thick colored resin fiber substrate, whose measured average dielectric constant and loss tangent are 1.79 and 0.055, respectively. The low dielectric constant of the substrate facilitates improved impedance bandwidth of the proposed design. An inverted trapezoidal-shaped ground slot and a neutralization line are integrated into the proposed antenna layout for isolation enhancement. The developed antenna offers a wide spectral range from 3.12 to 9.4 GHz with 100.32% fractional bandwidth that encompasses WiMAX (3.2–3.8 GHz), WLAN (5.15–5.35/5.725–5.825 GHz), C-band downlink/uplink (3.7–4.2/5.925–6.425 GHz), downlink defense (7.2–7.7 GHz), and ITU band (8–8.5 GHz). Across the working band, the proposed antenna demonstrates an isolation level above 26 dB and commendable diversity characteristics, including a lower envelope correlation coefficient (< 0.076), higher diversity gain (> 9.96 dB), minimal channel capacity loss (< 0.34 Bits/Sec/Hz), negligible magnitude of mean effective gain ratio between antenna ports (< 0.05 dB), and a robust total active reflection coefficient. The antenna achieves a maximum gain of 4.53 dBi with a radiation efficiency exceeding 81% over the operating band. For more detailed analytical insight, the equivalent circuit model for the proposed antenna is also implemented. The antenna also exhibits favorable time-domain properties over the operating band, ensuring its wideband operation capability. The alignment between simulated and measured findings is found in a well-matched condition.