基于分形CRLH-TL加载短截线超宽带滤波器设计

发布时间：2018-03-16 03:35

本文选题：复合左右手传输线　切入点：Minkowski分形曲线　出处：《压电与声光》2017年04期 　论文类型：期刊论文

【摘要】：传统基于微带缝隙和逆开环谐振器(CSRRs)的复合左右手传输线的带宽较窄、通带内反射损耗较大,限制了其应用。因此,该文采用了Minkowski分形的微带缝隙代替传统微带缝隙,有效地展宽了带宽,并通过在微带缝隙两侧加载短截线的方式进一步增加了带宽并改善了高频端带外抑制特性。分析了结构的尺寸参数对其传输特性的影响,并根据S参数计算了色散曲线、提出了等效电路模型。最后,运用所提出的方法设计了一款超宽带带通滤波器。该滤波器仅采用一个复合左右手(CRLH)结构单元,获得了超带宽2.1~9GHz(相对带宽124.3%)和较小的带内反射损耗(小于0.8dB),同时滤波器在9.5~12GHz的阻带范围内传输抑制大于20dB。测量结果、仿真结果与等效电路结果基本吻合,验证了该设计方法的有效性。
[Abstract]:The traditional microstrip gap and inverse open-loop resonator (CSR RRS) have narrow bandwidth and high reflection loss in the passband. Therefore, the Minkowski fractal microstrip slot is used to replace the traditional microstrip gap. The bandwidth is widened effectively, and the bandwidth is further increased by loading a truncation line on both sides of the microstrip slot, and the out-of-band suppression characteristic of the high frequency end is improved. The influence of the dimension parameters of the structure on the transmission characteristics is analyzed. The dispersion curve is calculated according to S parameters, and the equivalent circuit model is proposed. Finally, an UWB bandpass filter is designed by using the proposed method. The filter uses only one compound left and right hand CRLH structure unit. The measurement results show that the bandwidth is 2.1 ~ 9 GHz (relative bandwidth 124.3) and the in-band reflection loss is less than 0.8 dB, and the transmission suppression is greater than 20 dB in the stopband range of 9.5 ~ 12 GHz. The simulation results are in good agreement with the equivalent circuit results. The validity of the design method is verified.
【作者单位】：空军工程大学防空反导学院;
【基金】：国家自然科学基金资助项目(61372033) 电磁散射辐射重点实验室创新基金资助项目(STES2014-2)
【分类号】：TN713

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