In this paper, a novel miniaturized triple-band planar monopole antenna combing single-cell metamaterial structure and defected ground plane is proposed. The miniaturization and triple-band characteristic of the antenna are achieved by loading the designed multiresonant metamaterial unit cell. Furthermore, a compact annular defected ground structure is proposed and used to improve the bandwidth of the antenna effectively. The presented metamaterial inspired triple-band antenna has a compact size and a simple structure. To verify the performances of the antenna, a prototype is manufactured and measured. The experimental results indicate that the presented antenna has enough operating bandwidth of the 2.38–2.48, 3.37–3.79, and 4.36–6.06 GHz to cover all the desired WLAN and WiMAX operations. And the tested results also demonstrate that this antenna has good omnidirectional radiation patterns and reliable gains in three required bands. Thus, the presented antenna has broad prospects in many wireless communication applications.

中文翻译：

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一种用于 WLAN/WiMAX 应用的结合单单元超材料结构和缺陷接地平面的小型化三频平面天线

本文提出了一种结合单单元超材料结构和缺陷地平面的新型小型化三频平面单极天线。通过加载设计的多谐振超材料单元来实现天线的小型化和三频特性。此外，还提出了一种紧凑的环形缺陷接地结构，有效地提高了天线的带宽。所提出的超材料启发的三频天线具有紧凑的尺寸和简单的结构。为了验证天线的性能，制造并测量了原型。实验结果表明，所提出的天线具有 2.38-2.48、3.37-3.79 和 4.36-6.06 GHz 的足够工作带宽，可以覆盖所有所需的 WLAN 和 WiMAX 操作。测试结果还表明，该天线在三个所需频段具有良好的全向辐射模式和可靠的增益。因此，所提出的天线在许多无线通信应用中具有广阔的前景。