An Improved Parameters Extraction Method for Dumbbell-Shaped Defected Ground Structure

Yuchun Guo, Qing Wang

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DOI: 10.4236/eng.2010.23028                

Abstract

The paper presents an improved equivalent circuit parameters extraction method for the dumbbell-shaped defected ground structure (DGS). The new extraction parameters equations are obtained in closed-form expressions, which contain S11 and S21. The DGS unit with center frequency of 5 GHz is designed and fabricated on a TLX substrate with thickness of 1 mm and dielectric constant of 2.55. The circuit simulated results are in good agreement with the measured results. This parameters extraction method can be widely used for the design and analysis of DGS .

Keywords

Defected Ground Structure, Equivalent Circuit, Parameters Extraction Method, Dumbbell-Shaped DGS

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	J. I. Park, C. S. Kim, J. Kim, et al., “Modeling of a photonic bandgap and its application for the low-pass filter design,” Asia Pacific Microwave Conference, Vol. 2, pp. 331-334, 1999.
[2]	L. H. Weng, Y. C. Guo, X. W. Shi, et al., “An overview on defencted ground structure,” Progress in Electromag- netics Research B, Vol. 7, pp. 173-189, 2008.
[3]	H. J. Chen, T. H. Huang, C. S. Chang, et al., “A novel cross-shape DGS applied to design ultra-wide stop-band low-pass filters,” IEEE Microwave and Wireless Compo- nents Letters, Vol. 16, pp. 252-254, 2006.
[4]	J. X. Chen, J. L. Li, K. C. Wan, et al., “Compact quasi- elliptic function filter based on defected ground struct- ure,” IEE Proceedings Microwaves, Antennas and Propa- gation, Vol. 153, pp. 320-324, 2006.
[5]	J. L. Li, J. X. Chen, Q. Xue, et al., “Compact micro- strip lowpass filter based on defected ground structure and compensated microstrip line,”, IEEE MTT-S Inter- national Microwave Symposium Digest, pp. 4, 2005.
[6]	J.-S. Lim, C.-S. Kim, Y.-T. Lee, et al., “A spiral-shaped defected ground structure for coplanar waveguide,” IEEE Microwave and Wireless Components Letters, Vol. 12, pp. 330-332, 2002.
[7]	J. P. Thakur and P. Jun-Seok, “A new design approach for circular polarize antenna with DGS under the unbalanced feed-lines,” 36th European Microwave Conference, pp. 1483-1485, 2006.
[8]	H.-J. Choi, J.-S. Lim, Y.-C. Jeong, et al., “Doherty amplifier using load modulation and phase compen- sation DGS microstrip line,” 36th European Microwave Conference, pp. 352-355, 2006.
[9]	C. J. Wang and C. S. Lin, “Compact DGS resonator with improvement of Q-factor,” Electronics Letters, Vol. 44, pp. 908-909, 2008.
[10]	D.-J. Woo, T.-K. Lee, J.-W. Lee, et al., “Novel U-slot and V-slot DGSs for bandstop filter with improved Q factor,” IEEE Transactions on Microwave Theory and Techniques, Vol. 54, pp. 2840-2846, 2006.
[11]	J.-J. Koo, S.-M. Oh, M.-S. Hwang, et al., “A new DGS unequal power divider,” European Microwave Conference, pp. 556-559, 2007.
[12]	G. Xue, D. X. Qu, J. Li, et al., “Design of a novel DGS unit,” International Conference of Microwave and Milli- meter Wave Technology, pp. 354-356, 2008.
[13]	N. C. Karmakar, S. M. Roy and I. Balbin, “Quasi-static modeling of defected ground structure,” IEEE Transa- ctions on Microwave Theory and Techniques, Vol. 54, pp. 2160-2168, 2006.
[14]	H. W. Liu, X. W. Sun and Z. F. Li, “A new parameter- extraction method for DGS and its application to the low- pass filter,” Active and Passive Electronic Components, Vol. 27, pp. 119-123, 2004.
[15]	I. Garde, M. J. Yabar and C. Del Rio, “Simple modeling of DGS to design 1D-PBG low-pass filters,” Microwave and Optical Technology Letters, Vol. 37, pp. 228-232, 2003.
[16]	A. Balalem, A. R. Ali, J. Machac, et al., “Quasi-elliptic microstrip low-pass filters using an interdigital DGS slot,” IEEE Microwave and Wireless Components Letters, Vol. 17, pp. 586-588, 2007.