A novel ultra-wideband monopole antenna was proposed. The below semicircle of classic cyclo molopole of the antenna was replaced by two flip trapezoids. The proposed antenna was simulated and optimized by using the software Ansoft HFSS. The results show impedance bandwidth of the antenna is 2.48–15.23 GHz, that covers the bandwidth of the UWB communication system. The return lossS11 is less than or equal to –10 dB and the VSWR is less than or equal to 2 in the frequency range of 2.48–15.23 GHz. The proposed antenna possesses stable oriented radiation and meets the requirement of UWB communication system.%提出了一种新型的超宽带单极子天线，该天线将经典圆形单极子的下半圆用两个倒梯形替代，有效减小了天线的体积，利用电磁场仿真软件Ansoft HFSS对该天线进行了仿真优化。结果表明，该天线的阻抗带宽为2.48~15.23 GHz，覆盖了超宽带通信系统的带宽。该天线在2.48~15.23 GHz带宽内的S11≤–10 dB，VSWR≤2，具有比较稳定的辐射特性，符合超宽带通信系统的要求。
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