2010-09-16
A Compact Low-Pass Filter with Sharp Cutoff and Low Insertion Loss Characteristic Using Novel Defected Ground Structure
By
Progress In Electromagnetics Research Letters, Vol. 17, 133-143, 2010
Abstract
In this paper, a compact stepped-impedance hairpin resonator (SIHR) low-pass filter (LPF) with an improved split-ring resonator defected ground structure (ISRR DGS) and two elliptical DGSs is presented. The proposed LPF exhibits the advantages of low insertion loss, sharp cutoff characteristic, wide stopband over the ordinary LPFs. The introduced DGSs are presented to improve the in-band and out-band characteristic. An equivalent RLC circuit model of the two kinds of DGSs is presented and analyzed. Combining with these two structures, a new SIHR LPF having 3-dB cutoff frequency of 2.5 GHz is fabricated and measured. Measured results show that the selectivity of the proposed LPF is more than 100 dB/GHz and the insertion loss is less than 0.5 dB in the passband. A wide stop-band bandwidth with 20 dB attenuation from 2.58 up to 7.5 GHz is achieved. Moreover, the occupied area is only 20×25 mm2.
Citation
Dan Xi, Ying-Zeng Yin, Le-Hu Wen, Yuannan Mo, and Yan Wang, "A Compact Low-Pass Filter with Sharp Cutoff and Low Insertion Loss Characteristic Using Novel Defected Ground Structure," Progress In Electromagnetics Research Letters, Vol. 17, 133-143, 2010.
doi:10.2528/PIERL10062501
References

1. Lim, J. S., J. S. Park, Y. T. Lee, et al. "Application of defected ground structure in reducing the size of amplifiers," IEEE Microwave Guided Wave Lett., Vol. 12, 261-263, 2002.        Google Scholar

2. Liu, H.-W., L.-Y. Li, X.-H. Li, and S.-X. Wang, "Compact microstrip lowpass filter using asymmetric stepped-impedance hairpin resonator and slotted ground plane," Journal of Electromagnetic Waves and Applications, Vol. 22, No. 11--12, 1615-1622, 2008.
doi:10.1163/156939308786390184        Google Scholar

3. Sharma, R., T. Chakravarty, S. Bhooshan, and A. B. Bhattacharyya, "Design of a novel 3 dB microstrip backward wave coupler using defected ground structure," Progress In Electromagnetics Research, Vol. 65, 261-273, 2006.
doi:10.2528/PIER06100502        Google Scholar

4. Ahn, D., J. S. Park, C. S. Kim, Y. Qian, and T. Itoh, "A design of the low pass filter using the novel microstrip defected ground structure," IEEE Trans. Microwave Theory Tech., Vol. 49, 86-93, 2001.
doi:10.1109/22.899965        Google Scholar

5. Yang, M. H., J. Xu, Q. Zhao, L. Peng, and G. P. Li, "Compact, broad-stopband lowpass filters using SIRS-loaded circular hairpin resonators," Progress In Electromagnetics Research, Vol. 102, 95-106, 2010.
doi:10.2528/PIER09120901        Google Scholar

6. Yang, M. H., J. Xu, Q. Zhao, and X. Sun, "Wide-stopband and miniarurized lowpass filters using sirs-loaded hairpin resonators," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 17--18, 2385-2396, 2009.        Google Scholar

7. Park, J. S., J. H. Kim, J. H. Lee, S. H. Kim, and S. H. Myung, "A novel equivalent circuit and modeling method for defected ground structure and its application to optimization of a DGS low pass filter," IEEE Int. Microwave Symp. Digest, Vol. 1, 417-420, 2002.        Google Scholar

8. Cho, J. H. and J. C. Lee, "Microstrip stepped-impedance hairpin resonator low-pass filter with defected ground structure," Microwave Opt. Technol. Lett., 405-408, 2006.
doi:10.1002/mop.21364        Google Scholar

9. Fu, S., C. Tong, X. Li, W. Zhang, and K. Shen, "Compact miniaturized stepped-impedance lowpass filter with sharp cutoff characteristics," Microwave Opt. Technol. Lett., 2257-2258, 2009.
doi:10.1002/mop.24619        Google Scholar

10. Wu, B., B. Li, and C. Liang, "Design of low-loss filter using novel split-ring resonator defected ground structure," Microwave Opt. Technol. Lett., Vol. 49, 288-291, 2007.
doi:10.1002/mop.22111        Google Scholar

11. Kuo, J. T., M. J. Maa, and P. H. Lu, "Microstrip elliptic function filters with compact miniaturized hairpin resonators," Asia-Pacific Microwave Conf. Proc., Vol. 2, 860-864, 1999.        Google Scholar

12. Garde, I., M. J. Yabar, and C. del Rio, "Sample modeling of dgs to design 1 d-pbg low-pass filters," Microwave Opt. Technol. Lett., Vol. 37, 228-232, 2003.
doi:10.1002/mop.10878        Google Scholar

13. Chen, J., Z.-B.Weng, Y.-C. Jiao, and F.-S. Zhang, "Lowpass filter design of Hilbert curve ring defected ground structure," Progress In Electromagnetics Research, Vol. 70, 269-280, 2007.
doi:10.2528/PIER07012603        Google Scholar