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组合式非周期缺陷接地结构(CNPDGS)是从光子带隙结构发展而来的,它是在微波电路的金属接地平面上人为地蚀刻出非周期性的“缺陷”,改变接地电流的分布,从而改变传输线的频率特性。与光子带隙结构(PBG)一样,具有明显的禁带特性。文中利用时域有限差分法(FDTD)研究了由CNPDGS结构构成低通滤波器的频率特性,并在此基础上研制了带宽可调节的低通滤波器,测量结果与数值分析一致性很好,进一步验证了FDTD分析的正确性,CNPDGS低通滤波器的研制,为该类型滤波器的设计提供了依据。最后讨论了FDTD方法中完全匹配层(PML)对电路特性分析的影响,给出了电路特性随PML层数变化的曲线。这对FDTD法分析缺陷接地结构时PML的选取具有一定的参考价值。
The combined aperiodic defect ground structure (CNPDGS) evolved from a photonic bandgap structure that artificially etches aperiodic “defects” on the metal ground plane of a microwave circuit and changes the distribution of ground current to Change the frequency characteristics of the transmission line. Like Photonic Band Gap Structure (PBG), it has obvious band-gap characteristics. In this paper, the time-domain finite difference method (FDTD) was used to study the frequency characteristics of the low-pass filter constructed by CNPDGS structure. On the basis of this, a low-pass filter with adjustable bandwidth was developed. The measured results agree well with the numerical analysis, Further verify the correctness of FDTD analysis, CNPDGS low-pass filter development, provided the basis for the design of this type of filter. Finally, the influence of perfect matching layer (PML) on the circuit characteristics analysis in the FDTD method is discussed. The curve of circuit characteristics with the number of PML layers is given. This FDTD analysis of defective ground structure PML selection has some reference value.