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<p>This paper presents a nano-graphene two-port multiple-input/multiple-output (MIMO) antenna design optimized for terahertz frequency operation. The proposed antenna, fabricated on a silicon dioxide substrate (ɛ<sub>r</sub> = 4), achieves resonant frequencies at 1.1 THz and 2.9 THz with an ultra-super bandwidth of 0.8–3.16 THz with a minimum isolation of 22&#xa0;dB between the ports. The antenna’s compact volume of 1600 nm<sup>3</sup> (40&#xa0;nm × 20&#xa0;nm × 2&#xa0;nm) makes it suitable for integrated terahertz devices. The antenna achieves 14&#xa0;dB gain and 89% radiation efficiency. A small Neltec NY9208 lens (ɛ<sub>r</sub> = 2.08) is strategically placed below the radiating edges to enhance gain and radiation efficiency. It also helps the antenna to exhibit circular polarization from 1.27 THz to 2.1 THz. Simulation results using ANSYS HFSS demonstrate a significant gain improvement of up to 24&#xa0;dB and radiation efficiency of up to 97.4% across the operating spectrum. MIMO parameters including envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), mean effective gain (MEG), and channel capacity loss (CCL) are also acceptable. Additionally, the antenna partly exhibits circular polarization. The proposed design offers a promising solution for terahertz applications, including imaging, sensing, and communication systems. The antenna’s miniaturized size, wide bandwidth, and high efficiency make it an attractive candidate for integration into next-generation terahertz devices.</p>

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A Circularly Polarized Silicon-Dioxide-Based Compact Graphene Nano-MIMO Antenna with Multiple Neltec NY9208(IM) Lenses for Optical Connectivity with Improved Gain and Efficiency

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Atanu Chowdhury,
  • Prashant Ranjan

摘要

This paper presents a nano-graphene two-port multiple-input/multiple-output (MIMO) antenna design optimized for terahertz frequency operation. The proposed antenna, fabricated on a silicon dioxide substrate (ɛr = 4), achieves resonant frequencies at 1.1 THz and 2.9 THz with an ultra-super bandwidth of 0.8–3.16 THz with a minimum isolation of 22 dB between the ports. The antenna’s compact volume of 1600 nm3 (40 nm × 20 nm × 2 nm) makes it suitable for integrated terahertz devices. The antenna achieves 14 dB gain and 89% radiation efficiency. A small Neltec NY9208 lens (ɛr = 2.08) is strategically placed below the radiating edges to enhance gain and radiation efficiency. It also helps the antenna to exhibit circular polarization from 1.27 THz to 2.1 THz. Simulation results using ANSYS HFSS demonstrate a significant gain improvement of up to 24 dB and radiation efficiency of up to 97.4% across the operating spectrum. MIMO parameters including envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), mean effective gain (MEG), and channel capacity loss (CCL) are also acceptable. Additionally, the antenna partly exhibits circular polarization. The proposed design offers a promising solution for terahertz applications, including imaging, sensing, and communication systems. The antenna’s miniaturized size, wide bandwidth, and high efficiency make it an attractive candidate for integration into next-generation terahertz devices.