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<p>This study introduces a compact dual-element MIMO antenna specifically developed for ultra-wideband (UWB) operations. The antenna is constructed on an FR4 substrate, featuring dimensions of 20 × 28 × 1.6 mm<sup>3</sup> (0.26λ<sub>0</sub> × 0.37λ<sub>0</sub> × 0.022λ<sub>0</sub>, where λ<sub>0</sub> represents the wavelength in free-space at 4.2 GHz). The design utilizes a pair of radiators shaped like trees, to implement the MIMO functionality. To enhance isolation, the ground structure is optimized. Additionally, to improve both gain and isolation further, a frequency selective surface (FSS) with polarization insensitivity and angular stability is integrated.The designed antenna provides an operating bandwidth (OBW) ranging from 3.6 to 10.6 GHz, ensuring isolation above 20 dB and achieving highest gain of 9.85 dBi. The MIMO performance is analyzed using key metrics, comprising the Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Total Active Reflection Coefficient (TARC), and time response assessment. The experimentally tested ECC remains below 0.005, while the DG exceeds 9.87 dBi, demonstrating a linear phase response. These findings indicate that the suggested MIMO antenna is a viable option for implementation in ultra-wideband region.</p>

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FSS-based gain and isolation optimization in a two-element MIMO antenna for ultra-wideband operations

  • 期刊论文

  • 发表日期：

    2026年1月17日

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  • Mohd. Azharuddin,
  • Kalyan Mondal

摘要

This study introduces a compact dual-element MIMO antenna specifically developed for ultra-wideband (UWB) operations. The antenna is constructed on an FR4 substrate, featuring dimensions of 20 × 28 × 1.6 mm3 (0.26λ0 × 0.37λ0 × 0.022λ0, where λ0 represents the wavelength in free-space at 4.2 GHz). The design utilizes a pair of radiators shaped like trees, to implement the MIMO functionality. To enhance isolation, the ground structure is optimized. Additionally, to improve both gain and isolation further, a frequency selective surface (FSS) with polarization insensitivity and angular stability is integrated.The designed antenna provides an operating bandwidth (OBW) ranging from 3.6 to 10.6 GHz, ensuring isolation above 20 dB and achieving highest gain of 9.85 dBi. The MIMO performance is analyzed using key metrics, comprising the Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Total Active Reflection Coefficient (TARC), and time response assessment. The experimentally tested ECC remains below 0.005, while the DG exceeds 9.87 dBi, demonstrating a linear phase response. These findings indicate that the suggested MIMO antenna is a viable option for implementation in ultra-wideband region.