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Harmonic Suppression of Parallel Coupled-Line Bandpass Filters using Defected Microstrip Structure

机译:变形微带结构对并联耦合线带通滤波器的谐波抑制

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This paper presents a novel miniaturized parallel coupled-line bandpass filter by etching some slot resonators on the strip for suppressing the first spurious response. These slots perform a serious LC resonance property in certain frequency and suppress the spurious signals. By properly tuning these slot dimensions, multiple closed notches can be generated in the vicinity of spurious harmonic and a wide stopband can be obtained. Slot on the strip that is called Defected Microstrip Structure (DMS). The DMS interconnection disturbs the current distribution only across the strip, thereby giving a modified microstrip line with certain stop band and slow-wave characteristics. The simulation and measurement of a 4.7 GHz prototype bandpass filter are presented. The measured results show a satisfactory rejection level more than 30 dB at first spurious passband without affecting the passband response. Good agreement between the experimental and full-wave simulated results has been achieved.
机译:本文提出了一种新颖的小型化并行耦合线带通滤波器,其方法是在带材上刻蚀一些缝隙谐振器,以抑制第一寄生响应。这些缝隙在一定频率下会表现出严重的LC谐振特性,并抑制了寄生信号。通过适当地调整这些槽的尺寸,可以在寄生谐波附近产生多个闭合的切口,并且可以获得宽的阻带。条带上的插槽称为“缺陷微带结构(DMS)”。 DMS互连仅干扰整个条带上的电流分布,从而提供具有某些阻带和慢波特性的改进型微带线。介绍了一个4.7 GHz原型带通滤波器的仿真和测量。测量结果表明,在第一个杂散通带上,令人满意的抑制水平超过30 dB,而不会影响通带响应。实验结果和全波模拟结果之间取得了良好的一致性。

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