Althuwayb Ayman A, Alibakhshikenari Mohammad, Virdee Bal S, Shukla Pancham, Limiti Ernesto
Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka, Aljouf 72388, Saudi Arabia.
Electronic Engineering Department, University of Rome "Tor Vergata", Via del Politecnico 1, 00133 Rome, Italy.
Micromachines (Basel). 2021 Mar 6;12(3):269. doi: 10.3390/mi12030269.
This research article describes a technique for realizing wideband dual notched functionality in an ultra-wideband (UWB) antenna array based on metamaterial and electromagnetic bandgap (EBG) techniques. For comparison purposes, a reference antenna array was initially designed comprising hexagonal patches that are interconnected to each other. The array was fabricated on standard FR-4 substrate with thickness of 0.8 mm. The reference antenna exhibited an average gain of 1.5 dBi across 5.25-10.1 GHz. To improve the array's impedance bandwidth for application in UWB systems metamaterial (MTM) characteristics were applied it. This involved embedding hexagonal slots in patch and shorting the patch to the ground-plane with metallic via. This essentially transformed the antenna to a composite right/left-handed structure that behaved like series left-handed capacitance and shunt left-handed inductance. The proposed MTM antenna array now operated over a much wider frequency range (2-12 GHz) with average gain of 5 dBi. Notched band functionality was incorporated in the proposed array to eliminate unwanted interference signals from other wireless communications systems that coexist inside the UWB spectrum. This was achieved by introducing electromagnetic bandgap in the array by etching circular slots on the ground-plane that are aligned underneath each patch and interconnecting microstrip-line in the array. The proposed techniques had no effect on the dimensions of the antenna array (20 mm × 20 mm × 0.87 mm). The results presented confirm dual-band rejection at the wireless local area network (WLAN) band (5.15-5.825 GHz) and X-band satellite downlink communication band (7.10-7.76 GHz). Compared to other dual notched band designs previously published the footprint of the proposed technique is smaller and its rejection notches completely cover the bandwidth of interfering signals.
这篇研究文章描述了一种基于超材料和电磁带隙（EBG）技术在超宽带（UWB）天线阵列中实现宽带双陷波功能的技术。为了进行比较，最初设计了一个参考天线阵列，它由相互连接的六边形贴片组成。该阵列制作在厚度为0.8毫米的标准FR-4基板上。参考天线在5.25 - 10.1吉赫兹范围内的平均增益为1.5 dBi。为了改善该阵列在UWB系统中的阻抗带宽，应用了超材料（MTM）特性。这包括在贴片上嵌入六边形缝隙，并通过金属过孔将贴片与接地平面短路。这实际上将天线转变为一种复合左右手结构，其表现类似于串联左手电容和并联左手电感。所提出的MTM天线阵列现在在更宽的频率范围（2 - 12吉赫兹）内工作，平均增益为5 dBi。在所提出的阵列中加入了陷波带功能，以消除来自共存于UWB频谱内的其他无线通信系统的不需要的干扰信号。这是通过在接地平面上蚀刻圆形缝隙来引入电磁带隙实现的，这些圆形缝隙与每个贴片下方对齐，并连接阵列中的微带线。所提出的技术对阵列尺寸（20毫米×20毫米×0.87毫米）没有影响。给出的结果证实了在无线局域网（WLAN）频段（5.15 - 5.825吉赫兹）和X频段卫星下行链路通信频段（7.10 - 7.76吉赫兹）的双频段抑制。与先前发表的其他双陷波带设计相比，所提出技术的占地面积更小，其抑制陷波完全覆盖干扰信号的带宽。
