In this article a novel planar triple-band microstrip monopole antenna with circular polarization and high efficiency is presented for wireless communications applications. This antenna with passbands at 2.4, 3.5, and 5.5 GHz is able to cover WLAN and WiMAX applications according to the IEEE 802.11b/g and IEEE 802.16 standards. The proposed antenna consists of a C-shaped stub to control the circular polarization and an inverted triangular patch which has two slots to achieve mentioned frequency bands. The proposed monopole antenna with dimensions 40×47×1.6 mm is implemented on the FR4 substrate and fed by a 50 Ω microstrip line. Parametric study for antenna dimensions and measurement results are presented in the article. The S-parameters of less than −10 dB, efficiency above 90% and omnidirectional radiation patterns are obtained in the proposed antenna. A brief comparison is made on the characteristics of the proposed antenna and other antennas presented in the articles and the results are presented.

中文翻译：

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用于 WLAN 和 WiMAX 应用的带有 C 形短截线的圆极化高效微带天线

本文介绍了一种用于无线通信应用的具有圆极化和高效率的新型平面三频微带单极天线。这种通带为 2.4、3.5 和 5.5 GHz 的天线能够覆盖符合 IEEE 802.11b/g 和 IEEE 802.16 标准的 WLAN 和 WiMAX 应用。所提出的天线由控制圆极化的 C 形短截线和具有两个缝隙的倒三角形贴片组成，以实现上述频段。所提出的尺寸为 40×47×1.6 mm 的单极天线在 FR4 基板上实现，并由 50 Ω 微带线馈电。文章中介绍了天线尺寸和测量结果的参数研究。小于−10 dB 的 S 参数，效率高于 90%，并且在建议的天线中获得了全向辐射图。对本文提出的天线和其他天线的特性进行了简要比较，并给出了结果。