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<p>This paper presents a novel approach for overcoming the H plane coupling in a closely spaced MIMO (Multiple Input Multiple Output) antenna using a quasi-mirror symmetry metamaterial-inspired unit element for smart devices aided with a 5G NR (new radio) band of 3.5 GHz. The assembly of a stack of miniaturized metamaterial unit elements at the co-plane of the two-element MIMO antenna with 5 mm spacing among radiators creates an evanescent mode across the impedance bandwidth (3.45-3.53 GHz), thereby enhancing the port isolation by &gt;15 dB, with a reflection coefficient of -36.354 dB. Further, MIMO antenna parameters such as Mean Effective Gain (MEG), Envelope Correlation Coefficient (ECC) and Diversity Gain (DG) estimated were obtained as -3.01 dB, &lt;0.009, &gt;9.9 dB, respectively. The estimated MIMO parameters agree with the practical level of acceptance. Meanwhile, a near-perfect match between the simulation and experiments is evidenced in this article. Comparing existing literatures on Multiple Input Multiple Output (MIMO) antennas for 5G systems using metamaterial, the proposed compact-sized (<i>0.035λ</i><sub><i>O</i></sub><i> x 0.035λ</i><sub><i>O</i></sub>) decoupling structure entrusts optimal isolation in 5G MIMO antenna for lesser numbers of MM UEs (metamaterial unit element). All these features of the proposed design make them viable for space-constrained smart devices with <i>IEEE 802.16e</i> Wi-Max (3.4-3.5 GHz) wireless technology. Additionally, lumped equivalent circuit models for the proposed decoupling structure with the two-element MIMO antenna are also realized and reported in the paper.</p>

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Design of miniaturized decoupling structure and its equivalent circuit model for isolation enhancement in space-constrained MIMO antennas

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • R K Rabin Kanisha,
  • C Rimmya,
  • M Ganesh Madhan

摘要

This paper presents a novel approach for overcoming the H plane coupling in a closely spaced MIMO (Multiple Input Multiple Output) antenna using a quasi-mirror symmetry metamaterial-inspired unit element for smart devices aided with a 5G NR (new radio) band of 3.5 GHz. The assembly of a stack of miniaturized metamaterial unit elements at the co-plane of the two-element MIMO antenna with 5 mm spacing among radiators creates an evanescent mode across the impedance bandwidth (3.45-3.53 GHz), thereby enhancing the port isolation by >15 dB, with a reflection coefficient of -36.354 dB. Further, MIMO antenna parameters such as Mean Effective Gain (MEG), Envelope Correlation Coefficient (ECC) and Diversity Gain (DG) estimated were obtained as -3.01 dB, <0.009, >9.9 dB, respectively. The estimated MIMO parameters agree with the practical level of acceptance. Meanwhile, a near-perfect match between the simulation and experiments is evidenced in this article. Comparing existing literatures on Multiple Input Multiple Output (MIMO) antennas for 5G systems using metamaterial, the proposed compact-sized (0.035λO x 0.035λO) decoupling structure entrusts optimal isolation in 5G MIMO antenna for lesser numbers of MM UEs (metamaterial unit element). All these features of the proposed design make them viable for space-constrained smart devices with IEEE 802.16e Wi-Max (3.4-3.5 GHz) wireless technology. Additionally, lumped equivalent circuit models for the proposed decoupling structure with the two-element MIMO antenna are also realized and reported in the paper.