volume | PIER Journals

Abstract

A new defected ground structure (DGS) with tunable working frequency and reconfigurable bandwidth is proposed in this paper. The prototype combines the conventional DGS with T-shaped patch featuring narrow bandwidth and two such units located symmetrically featuring wide bandwidth. The proposed structure is designed, simulated and measured. By embedding two reversely-set PIN diodes and four varactors, the proposed structure achieves a narrow bandwidth with a tuning range of 21.1% and a wide bandwidth with a tuning range of 24.6%. In comparison, the bandwidth (-10 dB) is about 13.6% for the narrowband state and 49.2% for the broadband state, where an approximately 4-times extension is obtained.

1. Ahn, D., J.-S. Park, C.-S. Kim, J. Kim, Y. Qian, and T. Itoh, "A design of the low-pass filter using the novel microstrip defected ground structure," IEEE Trans. Microw. Theory Tech., Vol. 49, No. 1, 86-93, Jan. 2001.
doi:10.1109/22.899965

2. Lim, J. S., C. S. Kim, D. Ahn, Y. C. Jeong, and S. Nam, "Design of low-pass filters using defected ground structure," IEEE Trans. Microw. Theory Tech., Vol. 53, No. 8, 2539-2545, Aug. 2005.
doi:10.1109/TMTT.2005.852765

3. Mandal, M. K. and S. Sanyal, "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

4. Geng, J. P., J. J. Li, R. H. Jin, S. Ye, X. L. Liang, and M. Z. Li, "The development of curved microstrip antenna with defected ground structure," Progress In Electromagnetics Research, Vol. 98, 53-73, 2009.
doi:10.2528/PIER09081905

5. Woo, D. J., T. K. Lee, J. W. Lee, C. S. Pyo, and W. K. Choi, "Novel U-slot and V-slot DGSs for bandstop filter with improved Q factor," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 6, 2840-2847, Jun. 2006.
doi:10.1109/TMTT.2006.875450

6. Wang, X. H., B. Z. Wang, H. Zhang, and K. J. Chen, "A tunable bandstop resonator based on a compact slotted ground structure," IEEE Trans. Microw. Theory Tech., Vol. 55, No. 9, 1912-1918, Sep. 2007.
doi:10.1109/TMTT.2007.904045

7. Safwat, A. M., F. Podevin, P. Ferrari, and A. Vilcot, "Tunable bandstop defected ground structure resonator using recon¯gurable dumbbell-shaped coplanar waveguide," IEEE Trans. Microw. Theory Tech., Vol. 54, No. 9, 3559-3564, Sep. 2006.
doi:10.1109/TMTT.2006.880654

8. Chun, Y.-H., J.-S. Hong, P. Bao, T. J. Jackson, and M. J. Lancaster, "Tunable slotted ground structured bandstop filter with BST varactors," IET Microw. Antennas Propag., Vol. 3, No. 5, 870-876, 2009.
doi:10.1049/iet-map.2008.0308

9. Mohamed, H. A., H. B. El-Shaarawy, E. A. Abdallah, and H. El-Hennawy, "Compact reconfigurable dual mode resonator with switchable band using RF PIN diodes," PIERS Proceedings, 1072-1076, Stockholm, Sweden, Aug. 12-15, 2013.

10. Wu, S.-J., C.-H. Tsai, T.-L. Wu, and T. Itoh, "A novel wideband common-mode suppression filter for gigahertz di®erential signals using coupled patterned ground structure," IEEE Trans. Microw. Theory Tech., Vol. 57, No. 4, 848-855, Apr. 2009.
doi:10.1109/TMTT.2009.2015087

11. Hong, J.-S. G. and M. J. Lancaster, Microstrip Filter for RF/Microwave Applications, 245-249, Wiley, New York, 2001.
doi:10.1002/0471221619

Dr. Xue Cao

Mr. Kai-Yu Zhao

Dr. Li-Li Yang

Dr. Lin Li