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设计了一种新型双陷波超宽带印刷天线。辐射贴片底部为梯形结构,实现了良好的阻抗匹配。通过在贴片上加载两个U型缝隙,分别在中心频率3.5GHz和5.5GHz处产生陷波。比较陷波前后天线表面电流密度,并用传输线理论对陷波产生机理进行了分析。天线实测与仿真结果吻合,通带内天线辐射效果良好,陷波频段内增益下降超过5dB,达到了陷波抑制的效果。
A new double-notch ultra-broadband printed antenna is designed. Radiation patch at the bottom of the ladder structure, to achieve a good impedance matching. By loading two U-shaped slots in the patch, a notch occurs at 3.5 GHz and 5.5 GHz, respectively, at the center frequency. The surface current density of the antenna was compared before and after the notch, and the mechanism of the notch was analyzed by transmission line theory. The measured results of the antenna are in good agreement with the simulation results. The radiation effect of the antenna in the pass band is good, and the gain in the notch band is reduced by more than 5 dB, which achieves the effect of notch suppression.