Browse > Article

A Compact Three Stage Low-Pass Filter with an Ultra-Wide Stopband  

김경훈 (아주대학교 전자공학부)
정종호 (아주대학교 전자공학부)
기철식 (아주대학교 전자공학부)
임한조 (아주대학교 전자공학부)
박익모 (아주대학교 전자공학부)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.40, no.3, 2003 , pp. 25-31 More about this Journal
Abstract
In this paper, we proposed a novel compact microstrip lowpass filter with an ultra-wide stopband and a sharp cutoff frequency response. To improve the cutoff response of the conventional filter, the coupling effect between two open stubs is used. The slot on the ground with conventional shunt open stubs plays an important role of increasing the stopband at a high frequency. The combination of these structures gives the filter the characteristics of an ultra-wide stopband with a prominent cutoff sharpness. The fabricated microstrip lowpass filter with the size of 19.2 mm $\times$ 14.9 mm has -3 dB cutoff frequency at 1.1 GHz and -20 dB stopband from 1.5 GHz to over 30 GHz. The insertion loss is less than -0.15 dB in the passband.
Keywords
Microstrip lowpass filter; Coupled line; Ultra-wide stopband;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 S. Y. Lee and C. M. Tsai, 'New cross-coupled filter design using improved hairpin resonators,' IEEE Trans. Microwave Theory Tech., vol. 48, no. 12, pp. 2482-2490, Dec. 2000   DOI   ScienceOn
2 L. H. Heish and K. Chang, 'Compact lowpass filter using stepped impedance hairpin resonator,' Electron. Lett., vol. 37, no. 14, pp. 899-900, July 2001   DOI   ScienceOn
3 R. Mongia, I. Bahl, and P. Bhartia, RF and Microwave coupled-line circuits, Boston: Artech House, 1999
4 K. C. Gupta, R. Carg, I. Bahk, and P. Bhartia, Microstrip Lines and Slotlines, Boston: Artech House, 1996
5 T. Kim and C. Seo, 'A novel photonic bandgap structure for low-pass filter of wide stopband,' IEEE Microwave Guided Wave Lett., vol. 10, no. 1, pp. 13 - 15, Jan. 2000   DOI   ScienceOn
6 I. Rumsey, M. Piker-May, and P. K. Kelly, 'Photonic bandgap structures used as filters in microstrip circuits,' IEEE Microwave Guided Wave Lett., vol. 8, no. 10, pp. 336-338, Oct, 1998   DOI   ScienceOn
7 M. Makimoto and S. Yamashita, Microwave Resonators and Filters for Wireless Communication, Berlin: Springer, 2001
8 F. Yang, Y. Qian, and T. Itoh, 'A novel uniplanar compact PBG structure for filter and mixer application,' IEEE MTT-S Digest, Vol. 3, pp. 919-922, 1999   DOI
9 D. M. Pozar, Microwave Engineering, New York : John Wiley & Sons, 1998
10 D. Ahn, J. S. Park, C. S. Kim, Y. Qian, and T. Itoh, 'A design of the low-pass filter using the novel microstrip defected gound structure,' IEEE Tran, Microwave Theory Tech., vol. 49, no. 1, pp. 86-93, Jan. 2001   DOI   ScienceOn
11 M. J. Lancaster and J. S. Hong, Microstrip Filters For RF/Microwave Applicarions, New York: John Wiley & Sons, 2001