A design-of the novel coupled-line bandpass filter using defected ground structure with wide stopband performance
A design-of the novel coupled-line bandpass filter using defected ground structure with wide stopband performance
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DOI：
10.1109/tmtt.2002.802313
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发表时间：
2002-09-01
影响因子：
4.3
通讯作者：
Ahn, D
中科院分区：
文献类型：
--
作者：
Park, JS;Yun, JS;Ahn, D
本文提出了一种新型的三极微带耦合线带通滤波器。提出的带通滤波器使用缺陷接地结构（DGS）部分，同时实现谐振器和逆变器。所提出的耦合线带通滤波器具有紧凑的尺寸和低插入损耗特性。此外，一个DGS形状的微带线是新提出的。所提出的DGS单元结构在某些频带内具有谐振特性。由于DGS的谐振特性，所提出的耦合线滤波器可以提供宽阻带特性的衰减极点。提出的DGS单位部分的等效电路进行了说明。采用三维有限元计算和简单电路分析方法，提取了DGS的等效电路参数。基于耦合线滤波器理论和DGS的等效电路，推导了耦合线滤波器的设计方法。实验结果与理论模拟结果吻合良好。
In this paper, a novel three-pole coupled-line bandpass filter with a microstrip configuration is presented. Presented bandpass filters use defected ground structure (DGS) sections to simultaneously realize a resonator and an inverter. The proposed coupled-line bandpass filter provides compact size with low insertion-loss characteristic. Furthermore, a DGS shape for a microstrip line is newly proposed. The proposed DGS unit structure has a resonance characteristic in some frequency band. The proposed coupled-line filter can provide attenuation poles for wide,stopband characteristic due to resonance characteristic of DGS. The equivalent circuit for the proposed DGS unit section is described. The equivalent-circuit parameters for DGS are extracted by using a three-dimensional finite-element-method calculation and simple circuit analysis method. A design method for the proposed coupled-line filter is derived based on coupled-line filter theory and the equivalent circuit of the DGS. The experimental results show excellent agreements with theoretical simulation results.