基于DGS的滤波器的研究与设计

发布时间：2019-03-19 13:20

【摘要】：在微波集成电路(Microwave Integrated Circuits,MIC)和射频集成电路(Radio Frequency Integrated Circuits,RFIC)中,为了满足滤波器有陡峭的截止频率、较宽的阻带、紧凑的结构以及良好的插入损耗的要求,基于缺陷接地结构(Defected Ground Structure,DGS)的滤波器的就应运而生,并很快成为了众多学者们研究的对象。本论文主要针对DGS的基本理论和设计方法展开了分析研究,并将结构应用于微波滤波器的设计当中,主要工作如下:首先,在基于哑铃形DGS平行耦合线滤波器的基础上进行图形变换,得到的全新滤波器结构紧凑,耦合加强,通带范围3.1GHz-10.6GHz,具有超宽带带通特性。接着,在传统DGS的基础上进行变形得到一种改进型的DGS,在电路尺寸不增加的情况下,性能得到改善。之后在微带线上加载开路枝节实现改进型DGS的级联,阻带范围达到15GHz,有良好的低通特性。并将此低通滤波器与阻带带宽小的超宽带带通滤波器相结合,阻带从12.7GHz-20GHz,带外抑制达到-20dB以下,完成了有良好带外抑制的超宽带带通滤波器的设计。最后用矢量网络分析仪测量加工好的滤波器,实测结果与仿真结果吻合得很好,证明基于DGS的微波滤波器的设计是真实可信的。本论文主要设计了几种基于DGS的滤波器,并对其各性能进行了研究与分析,所得结论对于微波滤波器的设计有一定的价值。
[Abstract]:In microwave integrated circuit (Microwave Integrated Circuits,MIC (microwave integrated circuit) and radio frequency integrated circuit (Radio Frequency Integrated Circuits,RFIC), in order to meet the requirements of steep cut-off frequency, wide bandgap, compact structure and good insertion loss, The filter based on defect grounding structure (Defected Ground Structure,DGS) emerged as the times require, and soon became the research object of many scholars. In this paper, the basic theory and design method of DGS are analyzed and studied, and the structure is applied to the design of microwave filter. The main work is as follows: first of all, Based on the parallel coupling line filter of dumbbell-shaped DGS, the new filter has compact structure, enhanced coupling, 3.1GHz band range and 10.6GHz band-pass range, and has ultra-wideband band-pass characteristics. Then, a modified DGS, based on the traditional DGS is obtained and the performance of the modified DGS, is improved without increasing the size of the circuit. After that, the modified DGS cascade is realized by loading open-circuit branches on the microstrip line. The blocking band range is up to 15GHz, and it has good low-pass characteristics. Combining the low-pass filter with the ultra-wideband band-pass filter with small blocking band bandwidth, the band-stop band is reduced from 12.7GHz to 20GHz and the out-of-band suppression reaches below-20dB. The design of the ultra-wideband bandpass filter with good out-of-band rejection has been completed. Finally, a vector network analyzer is used to measure the processed filter, and the measured results are in good agreement with the simulation results. It is proved that the design of microwave filter based on DGS is true and reliable. In this paper, several filters based on DGS are designed, and their performances are studied and analyzed. The conclusions are valuable for the design of microwave filters.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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