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<p>The rapid evolution of 5G communication systems demands innovative antenna solutions that have a great emphasis on efficient performance at millimeter-wave frequencies. To meet these requirements for reliable communication over 5G mmWave wireless networks, this work introduces a frequency selective surface (FSS) integrated self-isolated four elements Multiple Input Multiple Output (MIMO) system with extremely large bandwidth (12&#xa0;GHz), improved isolation (−32&#xa0;dB at 28&#xa0;GHz), peak gain (7.18&#xa0;dBi), increased radiation efficiency (73%) and miniaturized size of 44.2&#xa0;mm × 44.2&#xa0;mm × 8.356&#xa0;mm. The design methodology involves meticulous optimization of MIMO antenna and FSS geometry in CST Microwave Studio, focusing on achieving a compact structure with superior performance. The FSS based decoupling structure (21 × 21-unit cells) with the MIMO antenna produces a broad bandwidth from 22.3 to 34.3&#xa0;GHz, increases the gain from 3.2 to 7.18&#xa0;dBi and reduces mutual coupling between MIMO elements. The evaluation of MIMO diversity metrics exhibits a low ECC (&lt;0.002), high DG (&gt;9.999), low CCL (&lt;0.25 bits/s/Hz) and low TARC (&lt;−10&#xa0;dB). The experimental validations and MIMO performance evaluation proves that it is appropriate for tiny 5G systems or devices with limited space, including 5G mobile phones, IoT devices, and small base stations operating in mmWave frequency ranges.</p>

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Frequency selective surface integrated self-isolated four element MIMO antenna for 5G mmWave applications

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • S. Thilagavathi,
  • R. Sudhakar

摘要

The rapid evolution of 5G communication systems demands innovative antenna solutions that have a great emphasis on efficient performance at millimeter-wave frequencies. To meet these requirements for reliable communication over 5G mmWave wireless networks, this work introduces a frequency selective surface (FSS) integrated self-isolated four elements Multiple Input Multiple Output (MIMO) system with extremely large bandwidth (12 GHz), improved isolation (−32 dB at 28 GHz), peak gain (7.18 dBi), increased radiation efficiency (73%) and miniaturized size of 44.2 mm × 44.2 mm × 8.356 mm. The design methodology involves meticulous optimization of MIMO antenna and FSS geometry in CST Microwave Studio, focusing on achieving a compact structure with superior performance. The FSS based decoupling structure (21 × 21-unit cells) with the MIMO antenna produces a broad bandwidth from 22.3 to 34.3 GHz, increases the gain from 3.2 to 7.18 dBi and reduces mutual coupling between MIMO elements. The evaluation of MIMO diversity metrics exhibits a low ECC (<0.002), high DG (>9.999), low CCL (<0.25 bits/s/Hz) and low TARC (<−10 dB). The experimental validations and MIMO performance evaluation proves that it is appropriate for tiny 5G systems or devices with limited space, including 5G mobile phones, IoT devices, and small base stations operating in mmWave frequency ranges.