In this paper, a novel electromagnetic bandgap structure (EBGs) is proposed, which is similar to the mushroom-like EBG. By introducing double reverse split rings (RSR) into the square patch, the size of EBG cell is reduced by 30%, and the bandgap achieves bandwidth about 65%. A fractal microstrip antenna is implemented using the EBGs as a ground plane, and the measured results show that the reduction in the surface wave level is remarkable. Compared with the reference antenna at 5 GHz, an approximately 8 dB improvement of the return loss is achieved, and the back lobe is reduced by 10 dB in E plane and 8.73 dB in H plane at the resonant frequency, respectively. The front-back ratios of the antenna have significantly increased from 4.9 GHz to 5.2 GHz.
2. Radisic, V., Y. Qian, R. Coccioli, and T. Itoh, "Novel 2-D photonic bandgap structure for microstrip lines," IEEE Transactions on Microwave and Guided Wave Letters, Vol. 8, No. 2, 69-71, 1998.
3. Fan, Y. and Y. Rahmat-Samii, "Reflection phase characterizations of the EBG ground plane for low profile wire antenna applications," IEEE Transactions on Antennas and Propagation, Vol. 51, No. 10, 2691-2703, 2003.
4. Coccioli, R., W. R. Deal, and T. Itoh, Radiation characteristics of a patch antenna on a thin PBG substrate, IEEE Transactions on Antennas and Propagation Society International Symposium, 1998, Vol. 2, 656-659, 1998.
5. Dan, Q. and L. Shafai, The performance of microstrip patch antennas over high impedance EBG substrates within and outside its bandgap, IEEE International Symposium on Microwave Antenn, Propagation and EMC Technologies for Wireless Communications, 2005. MAPE 2005, 423-426, 2005.
6. Qi, L., H. M. Salgado, A. M. Moura, and J. R. Pereira, Dual-band antenna design using an EBG artificial magnetic conducto ground plane, IEEE Transactions on Antennas and Propagation Conference, 2008. LAPC 2008. Loughborough, 217-220, 2008.
7. Sievenpiper, D., Z. Lijun, R. F. J. Broas, N. G. Alexopolous, and E. Yablonovitch, "High-impedance electromagnetic surfaces with a forbidden frequency band," IEEE Transactions on Microwave Theory and Techniques, Vol. 47, No. 11, 2059-2074, 1999.
8. Coccioli, R., F.-R. Yang, K.-P. Ma, and T. Itoh, "Aperture-coupled patch antenna on UC-PBG substrate," IEEE Transactions on Microwave Theory and Techniques, Vol. 47, 2123-2130, 1999.
9. Li, Y., M. Fan, F. Chen, J. She, and Z. Feng, "A novel compact electromagnetic-bandgap (EBG) structure and its applications for microwave circuits," IEEE Transactions on Microwave Theory and Techniques, Vol. 53, 183-190, 2005.
10. Zheng, Q.-R., B.-Q. Lin, Y.-Q. Fu, and N.-C. Yuan, "Characteristics and applications of a novel compact spiral electromagnetic band-gap (EBG) structure," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 2, 199-213, 2007.
11. Sievenpiper, D., High-impedance electromagnetic surfaces, Ph.D. Dissertation, Department of Electrical Engineering, University of California at Los Angeles, CA, 1999.
12. McVay, J. and N. Engheta, "High impedance metamaterial surfaces using Hilbert-curve inclusions," IEEE Microw. Wireless Co. Lett., Vol. 14, No. 3, 130-132, 2004.
13. Fan, R. H. M. Y., Z. H. Feng, and X. X. Zhang, "Advance in 2D-EBG research," J. Infrared Millimeter Waves, Vol. 22, No. 2, 2003.