A compact low-cost metamaterial circular monopole antenna for LTE applications is presented here. This paper addresses an asymmetric circular split-ring radiator for 2.6GHz (LTE-7 band), 3.5GHz (LTE-22 band). The design here employs split rings with varying split gaps in the consecutive ring layers of the radiating element which helped in achieving better impedance matching for obtaining multiband operation. The work presented here demonstrates the feasibility of achieving double negative material property, without loading the SRR’s separately in the system. The antenna was modeled using a 1.6mm thick FR-4 lossy material. The simulated results were compared with measured results and found to be in good agreement with each other. Employing asymmetric split ring as radiator helped in achieving 29% of size reduction in the patch layer. The modified split-ring radiator achieved directional radiation pattern and minimum side-lobe levels with a peak gain of 1.29 and 0.204dB at the lower band and upper band, respectively. The compact dimension 45×40mm2 of the radiating system makes it suitable for LTE-WLAN/Wi-Max applications.

中文翻译：

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面向LTE应用的低成本小型化超材料圆形裂环单极子辐射系统设计

此处介绍了一种用于 LTE 应用的紧凑型低成本超材料圆形单极天线。本文解决了 2.6 的不对称圆形开口环散热器GHz（LTE-7 频段），3.5GHz（LTE-22 频段）。此处的设计在辐射元件的连续环层中采用了具有不同裂隙的裂环，这有助于实现更好的阻抗匹配，从而获得多频带操作。这里介绍的工作证明了实现双负材料特性的可行性，而无需在系统中单独加载 SRR。天线采用 1.6mm 厚的 FR-4 有损材料。将模拟结果与实测结果进行比较，发现彼此之间具有良好的一致性。采用不对称开口环作为散热器有助于实现贴片层尺寸减少 29%。改进的裂环辐射器实现了定向辐射方向图和最小旁瓣电平，峰值增益分别为 1.29 和 0.204dB分别在低频段和高频段。紧凑的维度45×40毫米2辐射系统的特性使其适用于 LTE-WLAN/Wi-Max 应用。