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<p>This article presents the design and analysis of a novel four-port compact MIMO (Multi Input Multi Output) antenna, optimized for millimeter (mm) wave applications, with an ultra-wideband (UWB) spanning from 18.8 GHz to 41.3 GHz (74.87%), covering 5G new radio (NR) frequency range (FR)-2 spectrums. The proposed antenna of size 20 mm × 20 mm × 0.508 mm features a star-shaped copper patch fabricated on a Rogers RT duroid 5880 substrate. A thin, plus alike strip combination is strategically placed at the center of the substrate to reduce mutual coupling and enhance port isolation effectively. The antenna structure has been simulated using CST software and measured experimentally. The antenna exhibits wide impedance bandwidth, excellent isolation of − 52 dB maximum, high gain of 9.2 dBi, high radiation efficiency of 88% and excellent diversity characteristics such as Envelope Correlation Coefficient (ECC) below 0.003, Diversity Gain (DG) about 10 dB, Total Active Reflection Coefficient (TARC) value lower than −10 dB, Channel Capacity Loss (CCL) less than 0.35 bits/s/Hz and Mean Effective Gain (MEG) below −3 dB. This innovative wideband design is well-suited for high-speed data transmission, 5G FR-2 band mobile communication and next-generation wireless communication systems operating in the mm-wave frequency spectrum.</p>

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A quad-port sub millimeter and millimeter wave ultra-wideband compact MIMO antenna with isolation improvement for 5G FR-2 band applications

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Aamir Shafi Khan,
  • Surajit Kundu

摘要

This article presents the design and analysis of a novel four-port compact MIMO (Multi Input Multi Output) antenna, optimized for millimeter (mm) wave applications, with an ultra-wideband (UWB) spanning from 18.8 GHz to 41.3 GHz (74.87%), covering 5G new radio (NR) frequency range (FR)-2 spectrums. The proposed antenna of size 20 mm × 20 mm × 0.508 mm features a star-shaped copper patch fabricated on a Rogers RT duroid 5880 substrate. A thin, plus alike strip combination is strategically placed at the center of the substrate to reduce mutual coupling and enhance port isolation effectively. The antenna structure has been simulated using CST software and measured experimentally. The antenna exhibits wide impedance bandwidth, excellent isolation of − 52 dB maximum, high gain of 9.2 dBi, high radiation efficiency of 88% and excellent diversity characteristics such as Envelope Correlation Coefficient (ECC) below 0.003, Diversity Gain (DG) about 10 dB, Total Active Reflection Coefficient (TARC) value lower than −10 dB, Channel Capacity Loss (CCL) less than 0.35 bits/s/Hz and Mean Effective Gain (MEG) below −3 dB. This innovative wideband design is well-suited for high-speed data transmission, 5G FR-2 band mobile communication and next-generation wireless communication systems operating in the mm-wave frequency spectrum.