摘要：本文设计并分析了一种改进H形裂环谐振器(split ring resonator,SRR)的新型超材料。它具有负磁导率和负介电常数特性,且在X,Ku和Ka频带内具有多频共振特性。本文就超材料方向和位置的变化对不同配置下的贴片天线进行了分析。结果表明,新型超材料天线实现了性能优化,表现为9 d B的可观增益,77 GHz的带宽,100%的辐射效率,以及有源区65%的面积缩减。二阶分形超材料天线尺寸降至1/21,从而实现了高度小型化。该研究为急需小尺寸尖波束的通信领域提供了一种解决方案。

摘要：An effective technique to design compact low pass filter has been proposed in this paper. The proposed method is highly effective for L-band applications. Low impedance microstrip lines are arranged such that they work as open stubs to increase the selectivity of the filter. Using the proposed technique about 57% size reduction has been realized with sharper roll off characteristics. An empirical expression is derived to determine the dimension of resonators. For cut-off frequency of 1.7 GHz the investigated method has been fabricated and tested. There is a close agreement be-tween simulated and measured