volume | PIER Journals

Abstract

A dual-band dual-element multiple-input-multiple-output (MIMO) antenna system with enhanced isolation is proposed. The MIMO antenna system is based on printed 4-shaped antenna elements. Dual band isolation is achieved by using an array of printed capacitively loaded loops (CLLs) on the top side of the board for high band isolation improvement and a complementary CLL structure on the GND plane of the antenna for lower band isolation improvement. The lower band of operation covers 827-853 MHz and the higher band covers 2.3-2.98 GHz. Two prototypes were investigated to access the effect of the isolation mechanism. Measured isolation improvement of 10 dBs was observed in the lower operating band while the improvement in the higher band was approximately 2.5 dBs. The isolation improvement was at the expense of 5% reduction in efficiency. The measured gain patterns as well MIMO figures of merits such as the correlation factor, TARC and MEG were investigated as well.

1. Song, L. and J. Shen, Evolved Cellular Network Planning and Optimization for UMTS and LTE, CRC Press, 2011.
doi:10.1201/9781439806500

2. 3GPP TS 36.101, V8.3.0, , "EUTRA User Equipment Radio Transmission and Reception,", Septembe 2008. Google Scholar

3. Gesbert, D., S. Mansoor, S. Da-shan, P. J. Smith, and A. Naguib, "From theory to practice: An overview of MIMO space-time coded wireless systems," IEEE J. Sel. Areas Commun., Vol. 21, No. 3, 281-302, Apr. 2003.
doi:10.1109/JSAC.2003.809458 Google Scholar

4. Yoo, S. and S. Kahng, "A compact MIMO antenna using ZOR split ring resonator radiators with a decoupling structure," Microwave Journal, Vol. 54, No. 11, S26-S31, November 2011. Google Scholar

5. Li, H., J. Xiong, Z. Ying, and S. He, "High isolation compact four-port MIMO antenna systems with built-in filters as isolation structure," Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP), 1-4, 2010. Google Scholar

6. Chou, H. T., H. C. Cheng, H. T. Hsu, and L. R. Kuo, "Investigations of isolation improvement techniques for Multiple Input Multiple Output (MIMO) WLAN portable terminal applications," Progress In Electromagnetics Research, Vol. 85, 349-366, 2008.
doi:10.2528/PIER08090905 Google Scholar

7. Zhu, F., J. Xu, and Q. Xu, "Reduction of mutual coupling between closely-packed antenna elements using defected ground structure," Electronics Letters, Vol. 45, No. 12, 601-602, 2009.
doi:10.1049/el.2009.0985 Google Scholar

8. Han, M. and J. Choi, "Multiband MIMO antenna with a band stop filter for high isolation characteristics," Antennas and Propagation Society International Symposium, 1-4, 2009. Google Scholar

9. Yeom, I., J. Kim, and C. Jung, "Compact dual-band MIMO antenna with high isolation performance," Asia-Pacific Microwave Conference Proceedings (APMC), 766-769, 2010. Google Scholar

10. Li, Z., M. Han, X. Zhao, and J. Choi, "MIMO antenna with isolation enhancement for wireless USB dongle application at WLAN band," Antennas and Propagation Society International Symposium, 758-761, 2010. Google Scholar

11. Lee, C., S. Chen, and P. Hsu, "Integrated dual planar inverted-F antenna with enhanced isolation," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 963-965, 2009. Google Scholar

12. Min, K., D. Kim, and Y. Moon, "Improved MIMO antenna by mutual coupling suppression between elements," The European Conference on Wireless Technology, 125-128, 2005. Google Scholar

13. Karaboikis, M., C. Soras, G. Tsachtsiris, and V. Makios, "Compact dual-printed inverted-F antenna diversity systems for portable wireless devices," IEEE Antennas and Wireless Propagation Letters, Vol. 3, No. 1, 9-14, 2004.
doi:10.1109/LAWP.2004.825106 Google Scholar

14. Hsu, C., K. Lin, H. Su, H. Lin, and C. Wu, "Design of MIMO antennas with strong isolation for portable applications," IEEE Antennas and Propagation Society International Symposium, 1-4, 2009.
doi:10.1109/APS.2009.5171635 Google Scholar

15. Lee, Y., H. Chung, J. Ha, and L. Choi, "Design of a MIMO antenna with improved isolation using meta-material," International Workshop on Antenna Technology (iWAT'11), 231-234, 2011.
doi:10.1109/IWAT.2011.5752307 Google Scholar

16. Sarabandi, K. and Y. J. Song, "Subwavelength radio repeater system utilizing miniaturized antennas and metamaterial channel isolator," IEEE Transactions on Antennas and Propagation, Vol. 59, No. 7, 2683-2690, 2011.
doi:10.1109/TAP.2011.2152320 Google Scholar

17. Marques, R., F. Martin, and M. Sorolla, Metamaterials with Negative Parameters: Theory, Design and Microwave Applications, John Wiley and Sons, 2011.

18. Guo, Y. and R. Xu, "Planar metamaterials supporting multiple left-handed modes," Progress In Electromagnetics Research, Vol. 66, 239-251, 2006.
doi:10.2528/PIER06113001 Google Scholar

19. Hrabar, S., Z. Eres, and J. Bartolic, "Capacitively loaded loop as basic element of negative permeability meta-material," 32nd European Microwave Conference, 1-4, 2002. Google Scholar

20. Goussetis, G., A. P. Feresidis, S.Wang, Y. Guo, and J. C. Vardaxoglou, "Uniplanar left-handed artificial metamaterials," J. Opt. A: Pure Appl. Opt., Vol. 7, No. 2, S44, 2005.
doi:10.1088/1464-4258/7/2/006 Google Scholar

21. Guo, Y., G. Goussetis, A. P. Feresidis, and J. C. Vardaxoglou, "Efficient modeling of novel uniplanar left-handed metamaterials," IEEE Transactions on Microwave Theory and Techniques, Vol. 53, No. 4, 1462-1468, 2005.
doi:10.1109/TMTT.2005.845204 Google Scholar

22. Jan, M. A., D. N. Aloi, and M. S. Sharawi, "A 2 x 1 compact dual band MIMO antenna system for wireless handheld terminals," IEEE Radio and Wireless Symposium (RWS 2012), Santa Clara, California, January 2012. Google Scholar

23. Sharawi, M. S., M. A. Jan, and D. N. Aloi, "A 4-shaped 2 x 2 multi-standard compact MIMO antenna system for LTE mobile handsets," IET Microwaves, Ant. and Prop., Vol. 6, 685-696, June 2012.
doi:10.1049/iet-map.2011.0528 Google Scholar

24. Sonkki, M., E. Antonino-Daviu, M. Cabedo-Fabres, M. Ferrando-Bataller, and E. T. Salonen, "Improved planar wideband antenna element and its usage in a mobile MIMO system," IEEE Antennas and Wireless Propagation Letters, 1, 2012. Google Scholar

25. Lee, C. J., W. Huang, A. Gummalla, and M. Achour, "Small antennas based on CRLH structures: Concept, design, and applications," IEEE Antennas and Propagation Magazine, Vol. 53, No. 2, 10-25, 2011.
doi:10.1109/MAP.2011.5949321 Google Scholar

26. Han, M.-S. and J. Choi, "MIMO antenna using a decoupling network for next generation mobile application," 9th International Symposium on Communications and Information Technology (ISCIT'09), Icheon, South Korea, September 2009. Google Scholar

27. Lopez, N., C. Lee, A. Gummala, and M. Achour, "Compact metamaterial antenna array for Long Term Evolution (LTE) handset application," IEEE International Workshop on Antenna Techcnology (iWAT'09), Santa Monica, California, March 2009. Google Scholar

28. Lee, S. and J. Lee, "Electrically small MNG ZOR antenna with multilayered conductor," IEEE Antennas and Wireless Propagation Letters, Vol. 9, 724-727, 2010. Google Scholar

29. Yoo, S. and S. Kahng, "Negative permeability metamaterial structure based electrically small loop antenna," International Conference on Advanced Communication Technology (ICACT), 769-773, 2008. Google Scholar

30. Paul, H., "The significance of radiation efficiencies when using S-parameterss to calculate the received signal correlation from two antennas," IEEE Antennas and Wireless Propagation Letters, Vol. 4, No. 1, 97-99, June 2005.
doi:10.1109/LAWP.2005.845913 Google Scholar

31. Chae, S. H., S. K. Oh, and S. O. Park, "Analysis ofmutual coupling, correlations, and TARC in WiBro MIMO array antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 6, 122-125, 2007.
doi:10.1109/LAWP.2007.893109 Google Scholar

32. Browne, D. W., M. Manteghi, M. P. Fitz, and Y. Rahmat-Samii, "Experiments with compact antenna arrays for MIMO radio communications," IEEE Transactions on Antennas and Propagation, Vol. 54, No. 11, 3239-3250, 2006.
doi:10.1109/TAP.2006.883973 Google Scholar

33. Ding, Y., Z. Du, K. Gong, and Z. Feng, "A novel dual-band printed diversity antenna for mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 7, 2088-2096, July 2007.
doi:10.1109/TAP.2007.900249 Google Scholar

34. Ko, S. C. K. and R. D. Murch, "Compact integrated diversity antenna for wireless communications," IEEE Transactions on Antennas and Propagation, Vol. 49, 954-960, June 2001.
doi:10.1109/8.931154 Google Scholar

Prof. Mohammad S. Sharawi

Dr. Ahmed B. Numan

Dr. Daniel N. Aloi