volume | PIER Journals

Abstract

A novel dumb-bell-shaped defected ground structure (DB-DGS) with embedded capacitor is presented in this paper. Compared with conventional DB-DB-DGS structure, the proposed DB-DGS exhibits many attractive characteristics including double resonance, high Q value and compact size. The equivalent lumped circuit model for the novel DGS is developed, and its parameters are extracted. Based on this new DB-DGS, a low-pass filter (LPF) using the novel DB-DGS has been constructed, which provides a more steep rejection property, a wider stopband and compact size. The proposed structure is experimentally verified through the demonstration of a low-pass filter design.

1. San, S. and M. K. Man, "A novel defected ground structure for planar circuits," IEEE Microw. Wireless Compon. Lett., Vol. 16, No. 2, 93-95, Feb. 2006.
doi:10.1109/LMWC.2005.863192

2. Balalem, A., A. R. Ali, J. Machac, and A. Omar, "Quasi-elliptic microstrip low-pass filters using an interdigital DGS slot," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 8, 586-588, Aug. 2007.
doi:10.1109/LMWC.2007.901769

3. Chen, Q. and J. Xu, "DGS resonator with two transmission zeros and its application to lowpass filter design," Electron. Lett., Vol. 46, No. 21, 1447-1449, Oct. 2010.
doi:10.1049/el.2010.2251

4. Abdel-Rahman, A. B., A. K. Verma, and A. Boutejdar, "Control of bandstop response of hilo microstrip low-pass filter using slot in ground plane," IEEE Trans. Microwave Theory Tech., Vol. 52, No. 3, 1008-1013, Mar. 2004.
doi:10.1109/TMTT.2004.823587

5. Kim, C. S., J. S. Park, A. Dal, and J. B. Lim, "A novel 1-D periodic defected ground structure for planar circuits," IEEE Microw. Guided Wave Lett., Vol. 10, No. 4, 131-133, Apr. 2000.
doi:10.1109/75.846922

6. Dal, A., J. S. Park, C. S. Kim, J. Kim, Y. X. 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, No. 1, 86-93, Jan. 2001.
doi:10.1109/22.899965

7. Lim, J. S., C. S. Kim, D. Ahh, Y. C. Jeong, and S. Nam, "Design of low-pass filters using defected ground structure," IEEE Trans. Microwave Theory Tech., Vol. 53, No. 8, 2539-2544, Aug. 2005.
doi:10.1109/TMTT.2005.852765

8. Jung, S., Y.-K. Lim, and H.-Y. Lee, "A coupled-defected ground structure lowpass filter using inductive coupling for improved attenuation," Microw. Opt. Technol. Lett., Vol. 50, No. 6, 1541-1543, Jun. 2008.
doi:10.1002/mop.23419

9. Liu, H.-W., Z.-F. Li, X.-W. Sun, and J.-F. Mao, "An improved 1D periodic defected ground structure for microstrip line," IEEE Microw. Wireless Compon. Lett., Vol. 14, No. 4, 180-182, Apr. 2004.
doi:10.1109/LMWC.2004.827097

Dr. Zhi-Yong Chen

Dr. Lin Li

Dr. Si-Si Chen