In this paper, a new printed triple-band planar antenna combing two different modified monopoles and an arc-shaped defected ground plane is proposed and studied. The used two simple monopoles consist of a rectangular ring and a rectangular patch attached a straight metal strip. And a compact arc-shaped defected ground structure is proposed and used to excite higher resonance frequency and improve the impedance matching of the antenna at lower and middle resonance frequencies. The main radiation element of the proposed antenna composed of only two simple monopoles can support three omnidirectional radiation modes at three desired bands. To indicate the working mechanism of the antenna, the design process is illustrated and the parametric studies are carried out. The experimental results of the fabricated prototype confirm that the triple-band antenna has better radiation efficiencies, appropriate gains, and stable omnidirectional radiation patterns. And the tested results also show that the antenna can provide enough bandwidths of 2.35–2.52, 3.2–4.16, and 5.13–5.87 GHz to cover all the desired 2.4/5.2/5.8 GHz WLAN and 3.5/5.5 GHz WiMAX operations. Moreover, the presented antenna has a very simple structure. Thus, the designed antenna has high practicality and broad prospects for WLAN and WiMAX applications.

中文翻译：

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用于 WLAN/WiMAX 应用的带有弧形缺陷接地层的平面三波段单极天线

在本文中，提出并研究了一种结合了两个不同的改进单极子和一个弧形缺陷接地平面的新型印刷三频平面天线。使用的两个简单单极子由一个矩形环和一个矩形贴片组成，该贴片附有一条直的金属条。并提出了一种紧凑的弧形缺陷接地结构，用于激发更高的谐振频率，提高天线在中低谐振频率下的阻抗匹配。仅由两个简单单极子组成的建议天线的主要辐射元件可以在三个所需频段支持三种全向辐射模式。为了说明天线的工作机制，说明了设计过程并进行了参数研究。所制作样机的实验结果证实，三频天线具有较好的辐射效率、适当的增益和稳定的全向辐射方向图。并且测试结果还表明，该天线可以提供足够的 2.35–2.52、3.2–4.16 和 5.13–5.87 GHz 带宽，以覆盖所有所需的 2.4/5.2/5.8 GHz WLAN 和 3.5/5.5 GHz WiMAX 操作。此外，所提出的天线具有非常简单的结构。因此，所设计的天线在WLAN和WiMAX应用中具有很高的实用性和广阔的前景。此外，所提出的天线具有非常简单的结构。因此，所设计的天线在WLAN和WiMAX应用中具有很高的实用性和广阔的前景。此外，所提出的天线具有非常简单的结构。因此，所设计的天线在WLAN和WiMAX应用中具有很高的实用性和广阔的前景。