基于DGS的濾波器的研究與設(shè)計(jì)
[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.
【學(xué)位授予單位】:南京郵電大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TN713
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