1. Anguera, J., A. Andujar, M. C. Huynh, C. Orlenius, C. Picher, and C. Puente, "Advances in antenna technology for wireless handheld devices," International Journal on Antennas and Propagation, Vol. 2013, Article ID 838364, 2013. Google Scholar
2. Lin, C. P., C. H. Chang, and C. F. Jou, "Compact quad-band monopole antenna," Microwave and Optical Technology Letters, Vol. 53, No. 6, 1272-1276, Jun. 2011.
doi:10.1002/mop.25994 Google Scholar
3. Sun, X., G. Zeng, H. C. Yang, Y. Li, X. J. Liao, and L.Wang, "Design of an edge-fed quad-band slot antenna for GPS/WiMAX/WLAN applications," Progress In Electromagnetics Research Letters, Vol. 28, 111-120, 2011. Google Scholar
4. Cao, Y. F., S. W. Cheung, and T. I. Yuk, "A multiband slot antenna for GPS/WiMAX/WLAN systems," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 3, 952-958, Mar. 2015.
doi:10.1109/TAP.2015.2389219 Google Scholar
5. Xiong, L., P. Gao, and P. J. Tang, "Quad-band rectangular wide-slot antenna for GPS/WiMAX/WLAN applications," Progress In Electromagnetics Research C, Vol. 30, 201-2011, 2012.
doi:10.2528/PIERC12041301 Google Scholar
6. Sun, X., G. Zeng, H. C. Yang, and Y. Li, "A compact quad-band CPW-Fed slot antenna for MWiMAX/WLAN applications," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 395-398, Apr. 2012.
doi:10.1109/LAWP.2012.2192901 Google Scholar
7. Aziz, R. S., M. A. S. Alkanhal, and A. F. A. Sheta, "Multiband fractal-like antennas," Progress In Electromagnetics Research B, Vol. 29, 339-354, 2011.
doi:10.2528/PIERB11030904 Google Scholar
8. Liu, H., P. Wen, S. Zhu, B. Ren, X. Guan, and H. Yu, "Quad-band CPW-fed monopole antenna based on flexible pentangle-loop radiator," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 1373-1376, Feb. 2015. Google Scholar
9. Azaro, R., F. Viani, L. Lizzi, E. Zeni, and A. Massa, "A monopolar quad-band antenna based on a Hilbert self-affine prefractal geometry," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 177-180, Apr. 2009.
doi:10.1109/LAWP.2008.2001428 Google Scholar
10. Risco, S., J. Anguera, A. Andujar, A. Perez, and C. Puente, "Coupled monopole antenna design for multiband handset devices," Microwave and Optical Technology Letters, Vol. 52, No. 10, 359-364, Feb. 2010.
doi:10.1002/mop.24893 Google Scholar
11. Xu, H., H. Wang, S. Gao, H. Zhou, Y. Huang, Q. Xu, and Y. Cheng, "A compact and low-profile loop antenna with six resonant modes for LTE smartphone," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 9, 3743-3751, Sep. 2016.
doi:10.1109/TAP.2016.2582919 Google Scholar
12. Anguera, J., C. Picher, A. Bujalance, and A. Andujar, "Ground plane booster antenna technology for smartphones and tablets ," Microwave and Optical Technology Letters, Vol. 58, No. 6, 1289-1294, Jun. 2016.
doi:10.1002/mop.29788 Google Scholar
13. Caloz, C. and T. Itoh, Electromagnetic Metamaterials Transmission Line Theory and Microwave Applications, John Wiley & Sons, 2006.
14. Caloz, C., "Dual composite right/left-handed (D-CRLH) transmission line metamaterial," IEEE Microwave and Wireless Components Letters, Vol. 16, No. 11, 585-587, Nov. 2006.
doi:10.1109/LMWC.2006.884773 Google Scholar
15. Lee, W. H., A. Gummalla, and M. Achour, "Small antennas based on CRLH structures: Concept, design, and applications," IEEE Antennas and Propagation Magazine, Vol. 53, No. 2, 11-25, Apr. 2011.
doi:10.1109/MAP.2011.5949321 Google Scholar
16. Li, L., J. Zhen, F. Huo, and W. Han, "A novel compact multiband antenna employing dual-band CRLH-TL for smart mobile phone application," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 1688-1691, Dec. 2013.
doi:10.1109/LAWP.2013.2295915 Google Scholar
17. Ibrahim, A. A., A. M. E. Sfwat, and H. El-Hennawy, "Triple-band microstrip-fed monopole antenna loaded with CRLH unit cell," IEEE Antennas and Wireless Propagation Letter, Vol. 10, 1547-1550, Dec. 2011.
doi:10.1109/LAWP.2011.2181813 Google Scholar
18. Ryu, Y. H., J. H. Park, J. H. Lee, and H. S. Tae, "Multiband antenna using +1, −1, and 0 resonant mode of DGS dual composite right left handed transmission line," Microwave and Optical Technology Letters, Vol. 51, No. 10, 2485-2488, Oct. 2009.
doi:10.1002/mop.24649 Google Scholar
19. Quang, H. N. and H. Shirai, "A compact tri-band metamaterial antenna for WLAN and WiMAX applications ," Proc. of International Conference on Electromagnetics in Advanced Applications, 133-136, Sep. 2015. Google Scholar
20. Rennings, A., S. Otto, J. Mosig, C. Caloz, and I. Wolff, "Extended composite right/left-handed (E-CRLH) metamaterial and its application as quadband quarter-wavelength transmission line," Proc. of Asia-Pacific Microwave Conference, 1405-1408, Dec. 2006. Google Scholar
21. Eleftheriades, G. V., "A generalized negative refractive index transmission line (NRL-TL) metamaterial for dual-band and quad-band applications," IEEE Microwave and Wireless Component Letters, Vol. 17, No. 6, 415-417, Jun. 2007.
doi:10.1109/LMWC.2007.897786 Google Scholar
22. Ryan, C. G. M. and G. V. Eleftheriades, "A dual-band leaky-wave antenna based on generalized negative-refractive-index transmission-lines," Proc. of IEEE International Symposium on Antennas and Propagation, 1-4, Jul. 2010. Google Scholar
23. Duran-Sindreu, M., J. Choi, J. Bonache, F. Martin, and T. Itoh, "Dual-band leaky wave antenna with filtering capability based on extended-composite right/left-handed transmission lines," Proc. of IEEE MTT-S International Microwave Symposium Digest, Jun. 2013. Google Scholar
24. Abdalla, M. A. and M. A. Fouad, "CPW dual-band antenna based on asymmetric generalized metamaterial π NRI transmission line for ultra compact applications," Progress In Electromagnetics Research C, Vol. 62, 99-107, 2016.
doi:10.2528/PIERC15120604 Google Scholar
25. Gao, X., T. J. Jackson, and P. Gardner, "Multiband open-ended resonant antenna based on one ECRLH unit cell structure," IEEE Antennas and Wireless Propagation Letters, Vol. 16, 1273-1276, May 2017.
doi:10.1109/LAWP.2016.2632299 Google Scholar
26. Chu, H. B. and H. Shirai, "Analysis and design of E-CRLH TL characteristics with new closed-form solutions," Progress In Electromagnetics Research C, Vol. 68, 163-178, 2016.
doi:10.2528/PIERC16080103 Google Scholar
27. Pozar, D. M., Microwave Engineering, John Wiley & Sons, 2012.
28. Booket, M. R., M. Veysi, Z. Atlasbaf, and A. Jafargholi, "Ungrounded composite right-/left-handed metamaterials: Design, synthesis and applications," IET Microwaves, Antennas and Propagation, Vol. 6, No. 11, 1259-1268, May 2012.
doi:10.1049/iet-map.2011.0436 Google Scholar
29. Shu, P. L. and Q. I. Feng, "Design of a compact quad-band hybrid antenna for COMPASS/WiMAX/WLAN applications," Progress In Electromagnetics Research, Vol. 138, 585-598, 2013.
doi:10.2528/PIER13022708 Google Scholar