1. Yu, Y.-C. and J.-H. Tarng, "A novel modified multiband planar inverted-F antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 189-192, 2009.
doi:10.1109/lawp.2008.2000791        Google Scholar

2. Chen, S.-B., et al. "Modified T-shaped planar monopole antennas for multiband operation," IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 8, 3267-3270, 2006.
doi:10.1109/tmtt.2006.877811        Google Scholar

3. Pattnaik, S. S., J. G. Joshi, S. Devi, and M. R. Lohokare, "Electrically small rectangular microstrip patch antenna loaded with metamaterial," 2010 9th International Symposium on Antennas Propagation and EM Theory (ISAPE), 247-250, 2010.
doi:10.1109/isape.2010.5696445        Google Scholar

4. Veselago, V. G., "The electrodynamics of substances with simultaneously negative values of IMG align = ABSMIDDLE alt = ε eps/IMG and µ," Physics-Uspekhi, Vol. 10, No. 4, 509-514, 1968.
doi:10.1070/pu1968v010n04abeh003699        Google Scholar

5. Marqués, R., F. Martı́n, and M. Sorolla, "Metamaterials with Negative Parameters: Theory, Design and Microwave Applications," Design and Microwave Applications, 2011.        Google Scholar

6. Bilotti, F., A. Toscano, and L. Vegni, "Design of spiral and multiple split-ring resonators for the realization of miniaturized metamaterial samples," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 8, 2258-2267, 2007.
doi:10.1109/tap.2007.901950        Google Scholar

7. Elsheakh, D. M. and A. M. Safwat, "Compact 3D USB dongle monopole antenna for mobile wireless communication bands," International Journal of Microwave and Wireless Technologies, Vol. 6, No. 6, 639-644, 2014.
doi:10.1017/s1759078714000245        Google Scholar

8. Karthikeya, G. S., S. Kaundinya, and S. A. Hariprasad, "Dual band hexagonal microstrip antenna loaded with hexagonal and cylindrical EBG," 2014 IEEE Fifth International Conference on Communications and Electronics (ICCE), IEEE, 2014.
doi:10.1109/cce.2014.6916734        Google Scholar

9. Liang, J., et al. "Study of a printed circular disc monopole antenna for UWB systems," IEEE Transactions on Antennas and Propagation, Vol. 53, No. 11, 3500-3504, 2005.
doi:10.1109/tap.2005.858598        Google Scholar

10. Si, L.-M. and X. Lv, "CPW-FED multi-band omni-directional planar microstrip antenna using composite metamaterial resonators for wireless communications," Progress In Electromagnetics Research, Vol. 83, 133-146, 2008.
doi:10.2528/pier08050404        Google Scholar