In this work, an antenna that consists of two connected radiating elements is presented. The antenna has three operating bands, namely 2.5 GHz band, 3.5 GHz band, and narrow or wide 5.5 GHz band. To get a narrow 5.5 GHz band, a band-reject filter that eliminates the higher part of the third operating band is used. Measurements show that the antenna gain is 3.1 dB at 2.5 GHz; meanwhile at 8 GHz it has a gain of 4.9 dB. Adding a metallic reflector, a maximum gain of 5.8 dB has been measured at 3.7 GHz.

中文翻译：

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三频两元素天线

在这项工作中，提出了一种由两个相连的辐射元件组成的天线。天线具有三个工作频段，分别是2.5 GHz频段，3.5 GHz频段和窄或宽5.5 GHz频段。为了获得一个窄的5.5 GHz频带，使用了一个带阻滤波器，它消除了第三工作频带的较高部分。测量表明，在2.5 GHz频率下，天线增益为3.1 dB。同时在8 GHz时增益为4.9 dB。添加金属反射器后，在3.7 GHz处测得的最大增益为5.8 dB。