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<p>In modern wireless technologies like 4G, Wi-Fi, and 5G, Multiple-Input Multiple-Output (MIMO) antenna systems have become crucial for increasing spectrum efficiency, data speed, and reliability. Performance issues continue to exist, though, resulting from mutual coupling, less gain, and poor isolation between antenna parts. A promising passive technique to address all such issues is by means of frequency selective surfaces (FSS), which maximize radiation efficiency and improve gain as well as enhance isolation. This review presents a comprehensive analysis of FSS-based strategies implemented in MIMO antenna systems. A variety of FSS configurations, which includes single-layer, multilayer, fractal, and three-dimensional structures, are methodically addressed. A comprehensive evaluation is carried out of the effects on important performance metrics, such as return loss, isolation, gain, efficiency, and Envelope Correlation Coefficient (ECC). Table analyses of recent developments and performance comparisons are included. The difficulties of combining FSS with wearable and flexible antennas are also covered in the article, along with potential future developments. The goal of this paper is to give researchers working on high-performance antennas for next-generation wireless systems a helpful resource.</p>

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A comprehensive review on recent advances in frequency selective surface-based gain and isolation enhancement for multi input multi output (MIMO) antennas

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月11日

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  • Nirmala M,
  • Deepika Rani N

摘要

In modern wireless technologies like 4G, Wi-Fi, and 5G, Multiple-Input Multiple-Output (MIMO) antenna systems have become crucial for increasing spectrum efficiency, data speed, and reliability. Performance issues continue to exist, though, resulting from mutual coupling, less gain, and poor isolation between antenna parts. A promising passive technique to address all such issues is by means of frequency selective surfaces (FSS), which maximize radiation efficiency and improve gain as well as enhance isolation. This review presents a comprehensive analysis of FSS-based strategies implemented in MIMO antenna systems. A variety of FSS configurations, which includes single-layer, multilayer, fractal, and three-dimensional structures, are methodically addressed. A comprehensive evaluation is carried out of the effects on important performance metrics, such as return loss, isolation, gain, efficiency, and Envelope Correlation Coefficient (ECC). Table analyses of recent developments and performance comparisons are included. The difficulties of combining FSS with wearable and flexible antennas are also covered in the article, along with potential future developments. The goal of this paper is to give researchers working on high-performance antennas for next-generation wireless systems a helpful resource.