利用接地缺陷式結構的微帶線濾波器設計

本論文提出一種具有帶拒效應，於FR4基板背部蝕刻的接地缺陷式結構(DGS)，將其應用於平行耦合帶通濾波器，改善因奇偶模態相速不匹配在二倍頻與三倍頻產生諧波通帶的缺點。此外，我們找了三種不同形狀的接地缺陷式結構，改變它們的尺寸，探討對操作頻率的影響。然後我們用HFSS軟體設計一個中心頻率為2.5GHz的平行耦合帶通濾波器，在二倍頻 5.02GHz與三倍頻 7.32GHz出現了諧波通帶，加入接地缺陷式結構。最後以FR4基材加上接地缺陷式結構應用於實作，衰減量達到-30dB以下，證實了接地缺陷式結構擁有諧波抑制的效果。

關鍵字

耦合；帶通濾波器；接地缺陷式結構

並列摘要

This thesis presents a kind of band reject effects, etching back of defect ground structure (DGS) on FR4 substrate, used in parallel coupled bandpass filter. Improve on defect from the odd mode and even mode phase velocities are mismatch generate harmonic passband in the (2f0) and (3f0) . In addition, we found three DGS to change their size and find the effect of operating frequency in different shapes. Then we use the software of HFSS(High Frequency Structure Simulator) to design a parallel coupled bandpass filter in 2.5GHz of center frequency. The (2f0)5.02GHz and (3f0)7.32GHz appear on harmonic passband, by add DGS in parallel coupled bandpass filter. Finally, we take the FR4 substrate with DGS used in measurement and confirm defect ground structure can harmonic suppressions effectively, when attenuation take off to below -30dB.

並列關鍵字

Coupled ； Bandpass filter ； Defect ground structure

參考文獻

[1] C.S.Kim, J. S. Park, Dal Ahn, J.B.Lim,“A novel 1-D periodic defected ground structure for planar circuits”,2000

Google Scholar

[2] L.H. Weng, Y.C. Guo, X.W. Shi, Chen, X. Q.,“An Overview of Defected Ground Structure”,2008

Google Scholar

[3] Dal Ahn, Jun-Seok Park, Chul-Soo Kim, Juno Kim, Yongxi Qian, and Tatsuo Itoh,“Asign of the Low-Pass Filter Using the Novel Microstrip Defected Ground Structure”,2001

Google Scholar

[4] Shui-Yang Lin,“Wei-Zhong Tian, Shu-Qi Zheng, Xiao-Wei Sun, A Semicircle DGS With High Q Factor for Microstrip Line and Low-Pass Filter”,2006

Google Scholar

[5] Arjun Kumar, Kumar Goodwill, Ashwini K. Arya, M. V. Kartikeyan,“A Compact Narrow Band Microstrip Bandpass Filter with Defected Ground Structure (DGS)”,2012

Google Scholar

國際替代計量

利用接地缺陷式結構的微帶線濾波器設計

全文下載

主題瀏覽