1. Howell, J. Q., "Microstrip antennas," Dig. Int. Symp. Antennas Propagat. Soc., 177-180, Williamsburg, VA, Dec. 1972.

2. Liu, J., W.-Y. Yin, and S. He, "A new defected ground structure and its application for miniaturized switchable antenna," Progress In Electromagnetic Research, Vol. 107, 115-128, 2010.
doi:10.2528/PIER10050904

3. Arya, A. K., A. Patnaik, and M. V. Kartikeyan, "Gain enhancement of micro-strip patch antenna using dumbbell shaped defected ground structure," International Journal of Scientific Research Engineering & Technology (IJSRET), Vol. 2, No. 4, 184-188, Jul. 2013.

4. Nashaat, D., H. A. Elsade, E. Abdallah, H. Elhenawy, and M. F. Iskandar, "Multiband and miniaturized inset feed microstrip patch antenna using multiple spiral-shaped defect ground structure (DGS)," IEEE Antennas and Propagation Society International Symposium, APSURSI’09, 1-4, Jun. 1-5, 2009.

5. Lo, , T. K. and Y. Hwang, "Microstrip antennas of very high permittivity for personal communications," 1997 Asia Pacific Microwave Conference, 253-256, 1997.

6. Tirado-Mendez, J. A., M. A. Peyrot-Solis, H. Jardon-Aguilar, E. A. Andrade-Gonzalez, and M. Reyes-Ayala, "Applications of novel defected microstrip structure (DMS) in planar passive circuits," Proceedings of the 10th WSEAS International Conference on CIRCUITS, 336-369, Vouliagmeni, Athens, Greece, Jul. 10-12, 2006.

7. Chakraborty, M., B. Rana, P. P. Sarkar, and A. Das, "Size reduction of microstrip antenna with slots and defected ground structure," International Journal of Electronics Engineering, Vol. 4, No. 1, 61-64, 2012.

8. Elsheakh, D. M., H. A. Elsadek, E. A.-F. Abdallah, H. M. Elhenawy, and M. F. Iskander, "Miniaturized and multiband operations of inset feed microstrip patch antenna by using novel shape of defected ground structure (DGS) in wireless applications," PIERS Proceeding, 1082-1086, Moscow, Russia, Aug. 18-21, 2009.

9. Kim, H. M. and B. Lee, "Bandgap and slow fast-wave characteristics of defected ground structures (DGSs) including left-handed features," IEEE Trans. Microwave Theory Techn., Vol. 54, No. 7, 3113-3120, 2006.
doi:10.1109/TMTT.2006.877060

10. Arya, A. K., M. V. Kartikeyan, and A. Patnaik, "Efficiency enhancement of microstrip patch antennas with defected ground structure," Proc. IEEE Recent Advanced in Microwave Theory and Applications (MICROWAVE-08), 729-731, Nov. 2008.

11. Zulkifli, F. Y., E. T. Rahardjo, and D. Hartanto, "Mutual coupling reduction using dumbbell defected ground structure for multiband microstrip antenna array," Progress In Electromagnetics Research Letters, Vol. 13, 29-40, 2010.
doi:10.2528/PIERL09102902

12. Fan, M., R. Hu, Z. H. Feng, X. X. Zhang, and Q. Hao, "Advance in 2D-EBG structures research," The Journal of Infrared and Millimeter Waves, Vol. 22, No. 2, 2003.

13. Arya, A. K., A. Patnaik, and M. V. Kartikeyan, "Microstrip patch antenna with skew-F shaped DGS for dual band operation," Progress In Electromagnetics Research M, Vol. 19, 147-160, 2011.
doi:10.2528/PIERM11052305

14. Kapoor, S. and D. Parkash, "Miniaturized triple band microstrip patch antenna with defected ground structure for wireless communication applications," International Journal of Computer Applications, Vol. 57, No. 7, ISSN: 0975-8887, Nov. 2012.

15. Pozar, D. M., "Microstrip antennas," Proceedings of the IEEE, Vol. 80, No. 1, 79-91, Jan. 1992.
doi:10.1109/5.119568

16. Rahman, M. and M. A. Stuchly, "Transmission line-periodic circuit representation of planar microwave photonic bandgap structures," Microw. Opt. Technol. Lett., Vol. 30, 15-19, Jul. 2001.
doi:10.1002/mop.1207

17. 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 lowpass filter," IEEE MTT-S Int. Dig., 417-420, 2002.

18. Boutejdar, A., "Compensating for DGS filter loss," Microwave and Communication Engineering, Magdeburg, Germany, 2012.