基于超宽带天线的陷波频段可控性分析*

摘要

A novel planar ultra‐wideband antenna with dual band‐notched characteristics is proposed .Two U‐shaped slots are embedded into the radiating patch ,to obtain the notched bands at frequency of 3 .5GHz and 5 .5GHz ,and the cause of notched band is analyzed with the transmission line model theory .Three switches are embedded into the notched slot to reconfigure the notched band .The influence from the states of the switches changed has been analyzed according to equiva‐lent circuits evolving from the transition‐line theory .The measured results show that the UWB antennas have the ability to transition within the four working states which comprise no notched band ,3 .5GHz single notched band ,5 .5GHz single not‐ched band and both notched bands ,providing clear evidence for the achievement of the band‐notched characteristics reconfig‐uration .%设计了一种具有双陷波特性的超宽带单极子天线，在天线中加入两个“U”形缝隙结构，分别在3．3GHz～3．6GHz和5．15GHz～5．825GHz两个频段处产生陷波，并用传输线等效模型对陷波产生的原因进行了分析。在陷波缝隙处加入三个开关结构，对陷波频段进行控制。分析了开关状态的变化对等效电路的影响，对不同开关状态的超宽带天线进行制作并测试。结果表明，天线可以在无陷波、3．5G Hz单一陷波、5．5G Hz单一陷波和双陷波四种工作状态之间进行转换。