An ultra wideband printed monopole antenna with dual band circular polarization for wireless application is presented. The antenna dimensions are 30 × 30 × 1.6 mm3. The proposed antenna is able to cover frequency range between 2.65 GHz and 11GHz with impedance bandwidth is around 122%. With the use of I-shape slit in the radiation element and the T-slot in the ground plane, the ultra wideband and circular polarization are excited. In addition, the rectangular slit is added in the ground plane, to enhance the impedance- and Axial Ratio - bandwidth. Furthermore, the dual band circular polarization with right hand circular polarization at 3.1 GHz and the left hand circular polarization at 7GHz are obtained. Also, the 3-dB axial ratio bandwidths are about 242 and 246 MHZ at the lower and upper band without rectangular slit and 356 and 546 MHZ at the lower and upper band with rectangular slit, respectively.
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机译：提出了一种用于无线应用的具有双频带圆极化的超宽带印刷单极天线。天线尺寸为30×30×1.6 mm 3 。拟议中的天线能够覆盖2.65 GHz至11GHz的频率范围，阻抗带宽约为122％。通过在辐射元件中使用I形缝隙以及在接地平面中使用T形缝隙，可以激发超宽带和圆极化。另外，在地平面上增加了矩形缝隙，以增强阻抗和轴向比率的带宽。此外，获得具有在3.1GHz的右旋圆偏振和在7GHz的左旋圆偏振的双频带圆偏振。同样，在不具有矩形狭缝的下频带和上频带，3-dB轴向比率带宽分别约为242和246 MHZ，在具有矩形狭缝的下频带和上频带，其3-dB轴向比率带宽分别为356和546 MHZ。
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