用于包括物联网在内的未来应用的具有窄超宽带特性的柔性八端口非对称馈电MIMO天线的实验研究。

Experimental investigation of flexible eight-port asymmetric fed MIMO antenna with narrow-super-widebandn-s characteristics for future applications including internet of things.

作者信息

Sharma Manish, Chakkravarthy Selvaraj Praveen, Nallusamy Sathishkumar, Sharma Kanhaiya, Katrib Juliano, Gill Rana

机构信息

Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura, Punjab, India.

Department of BME, Dr. N.G.P. Institute of Technology, Coimbatore, Tamil Nadu, India.

出版信息

PLoS One. 2025 May 14;20(5):e0322279. doi: 10.1371/journal.pone.0322279. eCollection 2025.

DOI:10.1371/journal.pone.0322279

PMID:40367145

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12077693/

Abstract

In this work, an eight-port MIMOn-s antenna with dual-band operation is presented. The proposed work involves several wireless applications with FR1 and FR2 millimeter-wave bands. Also, a need for conformal antenna with capability of reduced SAR can cater the need for applications in flexible electronics. The antenna includes an oval-shaped radiating patch with a circular slot printed on Rogers RT Duroid TM5880 substrate on one plane and rectangular defected-ground-structure on the other side with a dimension of 70.71 × 70.71 mm2. The radiating patch and ground are asymmetric-fed producing measured bandwidth of Band 1 = 3.59-3.85GHz useful for WiMAX application and Band 2 = 8.40-70.0GHz for application in Industry-Scientific-Medical (ISM)-24.0 GHz, Ultra-wideband (UWB)-24.0GHz and millimeter-wave 5G-FR2 bands (n257-n263). The property of the substrate thickness = 0.254mm is utilized for bending angles of 15°, 30°, and 45° ensuring no change in -10.0dB impedance bandwidth making it suitable for flexible-electronics applications. The SARn-s is evaluated with antenna placed on tissue (skin, fat, muscle) model at SAR/frequency and found to be ≤ 1.60 W/Kg at key frequency values in the operating bandwidth of interest corresponding to 0.0331 W/Kg at 3.50GHz, 0.0435 W/Kg at 10.0GHz, 0.0131 W/Kg at 15.0GHz, 0.0209 W/Kg at 24.0GHZ, 0.0171 W/Kg at 26.0GHz, 0.0116 W/Kg at 28.0GHz, 0.00334 W/Kg at 38.0GHz, 0.00336 W/Kg at 39.0GHz, 0.00296 W/Kg at 41.0GHz, 0.00149 W/Kg at 47.0GHz and 0.0851 W/Kg at 60.0GHz. The diversity performance is also evaluated with measured ECCn-s < 0.02, DGn-s > 9.9998dB, TARCn-s < -8.0dB, and CCLn-s < 0.10b/s/Hz. The measured peak-gain varied between 2.965dBi-16.258dBi with maximum peak-gain of 16.13dBi at 60.0GHz including 2-D radiation patterns at WiMAX and other bands. The multi-band flexible-ability and acceptable SARn-s suggest the proposed well suited for WiMAX and future 5G applications in FR2 bands.

摘要

在这项工作中，提出了一种具有双频段操作的八端口MIMOn-s天线。所提出的工作涉及FR1和FR2毫米波频段的多种无线应用。此外，对具有降低比吸收率（SAR）能力的共形天线的需求能够满足柔性电子学中的应用需求。该天线包括一个椭圆形辐射贴片，在一个平面上的罗杰斯RT Duroid TM5880基板上印刷有圆形缝隙，另一侧是尺寸为70.71×70.71 mm²的矩形缺陷接地结构。辐射贴片和接地采用非对称馈电，测得的频段1带宽为3.59 - 3.85GHz，可用于WiMAX应用；频段2带宽为8.40 - 70.0GHz，可用于工业、科学和医疗（ISM）- 24.0GHz、超宽带（UWB）- 24.0GHz以及毫米波5G - FR2频段（n257 - n263）。利用厚度为0.254mm的基板特性，实现了15°、30°和45°的弯曲角度，确保-10.0dB阻抗带宽不变，使其适用于柔性电子应用。在将天线放置在组织（皮肤、脂肪、肌肉）模型上时，在感兴趣的工作带宽内的关键频率值处评估了比吸收率（SAR），发现在3.50GHz时为0.0331W/Kg、10.0GHz时为0.0435W/Kg、15.0GHz时为0.0131W/Kg、24.0GHz时为0.0209W/Kg、26.0GHz时为0.0171W/Kg、28.0GHz时为0.0116W/Kg、38.0GHz时为0.00334W/Kg、39.0GHz时为0.00336W/Kg、41.0GHz时为0.00296W/Kg、47.0GHz时为0.00149W/Kg以及60.0GHz时为0.0851W/Kg，SAR均≤1.60W/Kg。还评估了分集性能，测得的有效相关系数（ECC）<0.02，方向分集增益（DG）>9.9998dB，总主动互耦（TARC）<-8.0dB，以及相关系数线性度（CCL）<0.10b/s/Hz。测得的峰值增益在2.965dBi - 16.258dBi之间变化，在60.0GHz时最大峰值增益为16.13dBi，包括WiMAX和其他频段的二维辐射方向图。多频段柔性能力和可接受的比吸收率表明，所提出的天线非常适合WiMAX和未来5G在FR2频段的应用。