A compact planar monopole ultra-wideband (UWB) antenna with dual band-notched characteristics is proposed in order to minimize the interference between UWB systems and existing world interoperability for microwave access and wireless local area network operating bands. The antenna has a microstrip line-fed circular ring radiator with one etched partial concentric annular slot and one semi-circular slot. Two rectangular slots are also etched to connect the slots to the outer and inner periphery of the circular ring radia-tor. The desired dual band-notched UWB operation can be obtained by choosing the size and location of the etched slots. Experimental results show that with a compact size of 24 mm x 26 mm the proposed antenna achieves a wide impedance bandwidth from 2.79 to more than 11 GHz with two frequency notched bands of 3.3-3.8 and 5.1-6GHz for WiMAX and WLAN, respectively. Moreover, the antenna exhibits stable radiation charac-teristics and a good time domain behavior which makes it suitable for being used in the future UWB applications.
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机译：为了使UWB系统之间的干扰以及微波接入和无线局域网工作频带的现有世界互用性最小化，提出了一种具有双频带陷波特性的紧凑型平面单极超宽带（UWB）天线。该天线具有一个微带线馈电圆环辐射器，该辐射器带有一个蚀刻的局部同心环形槽和一个半圆形槽。还蚀刻了两个矩形槽，以将槽连接到圆环散热器的外周和内周。可以通过选择蚀刻槽的尺寸和位置来获得所需的双带缺口UWB操作。实验结果表明，以24 mm x 26 mm的紧凑尺寸，所建议的天线可实现2.79至11 GHz以上的宽阻抗带宽，并分别为WiMAX和WLAN提供两个3.3-3.8和5.1-6GHz的频率陷波频带。此外，该天线具有稳定的辐射特性和良好的时域特性，使其适合在未来的UWB应用中使用。
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