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<p>Achieving wide bandwidth, ensuring multiple-input multiple out (MIMO) element isolation and maintaining compactness are key challenges in in ultra-wideband (UWB) MIMO antenna design. A UWB compatible MIMO antenna is discussed in this work, demonstrating strong isolation performance. Antenna features half-elliptical radiating elements with elliptical slots, enhancing bandwidth across the 2.5–12&#xa0;GHz UWB range. Simulations of the proposed design are performed using computer simulation technology (CST) software on an FR-4 lossy substrate. To improve isolation, a circular ring-plus decoupling element is incorporated at the center of the MIMO array, resulting in an isolation enhancement of over 20 dB throughout the entire UWB range. The design features compact dimensions of 25 × 29.5 × 1.6&#xa0;mm³, making it suitable for wearable communication system. The measured results exhibit strong correlation with the simulated results, particularly in sustaining a low reflection coefficient of − 10 dB. Additionally, the MIMO antenna demonstrate an excellent capacity loss (CCL) under 0.001, and a total reflection coefficient (TARC) lower than − 10 dB. Furthermore, it achieves a gain from diversity more than 9.998, high radiation efficiency, desirable radiation patterns, a peak gain of approximately 6.5, and a correlation coefficient (ECC) below 0.003. The resistor inductor capacitor <b>(</b>RLC) equivalent circuit of the MIMO antenna is also analyzed for mutual coupling effects and optimizing isolation.</p>

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Resonator-integrated miniaturized UWB MIMO antenna with optimized isolation and circuit-based analysis

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Fatima Younis,
  • Adamu Halilu Jabire,
  • Owais Khan,
  • Abdelaaziz El Ansari,
  • Shiliang Wang,
  • Heng Luo

摘要

Achieving wide bandwidth, ensuring multiple-input multiple out (MIMO) element isolation and maintaining compactness are key challenges in in ultra-wideband (UWB) MIMO antenna design. A UWB compatible MIMO antenna is discussed in this work, demonstrating strong isolation performance. Antenna features half-elliptical radiating elements with elliptical slots, enhancing bandwidth across the 2.5–12 GHz UWB range. Simulations of the proposed design are performed using computer simulation technology (CST) software on an FR-4 lossy substrate. To improve isolation, a circular ring-plus decoupling element is incorporated at the center of the MIMO array, resulting in an isolation enhancement of over 20 dB throughout the entire UWB range. The design features compact dimensions of 25 × 29.5 × 1.6 mm³, making it suitable for wearable communication system. The measured results exhibit strong correlation with the simulated results, particularly in sustaining a low reflection coefficient of − 10 dB. Additionally, the MIMO antenna demonstrate an excellent capacity loss (CCL) under 0.001, and a total reflection coefficient (TARC) lower than − 10 dB. Furthermore, it achieves a gain from diversity more than 9.998, high radiation efficiency, desirable radiation patterns, a peak gain of approximately 6.5, and a correlation coefficient (ECC) below 0.003. The resistor inductor capacitor (RLC) equivalent circuit of the MIMO antenna is also analyzed for mutual coupling effects and optimizing isolation.