一种改进的U型超宽带单极子天线研究

摘要

A compact monopole microstrip ultra-wideband antenna is proposed. The bandwidth of the antenna is increased by adding a central block to the basic U-shaped structure and etching step-form slot on the partial ground plane. Both the simulation and experimental results show that the bandwidth and relative bandwidth of the antenna can reach 3 GHz~13 GHz( S11≤-10 dB) and 125% respectively. It has good omni-directional radiation pattern in the XZ plane and exhibits stability radiation pattern in the YZ plane. The proposed antenna satisfies the requirements of the UWB system,simple and compact in size,and ease of integration.%设计了一种小型的单极子宽带微带天线。该天线通过对U型状金属辐射体加入中心臂，在部分地面结构中开阶梯型凹槽，达到扩展天线带宽的目的。仿真及实测结果对比分析表明：该天线的频带宽度和相对带宽分别可达3 GHz~13 GHz ( S11≤-10 dB)和125%，在XZ面辐射图具有良好的全向性，在YZ平面具有很好的稳定性。基本满足了超宽带通信对天线的要求，而且结构简单，尺寸小，易于集成。