volume | PIER Journals

Abstract

A compact multiple-input-multiple-output (MIMO) antenna that covers the WLAN (2.4 GHz) and UWB (3.1-10.6 GHz) bands for wireless device applications is presented. The proposed antenna consists of two open L-shaped slot (LS) antenna elements and a narrow slot on the ground plane. The antenna elements are placed perpendicularly to each other to obtain a high isolation, and the narrow slot is added to reduce the mutual coupling between antenna elements at the WLAN band (2.4 GHz). The presented MIMO antenna has a small size of 40×40mm², and the prototypes of antenna is fabricated and measured. The measured results show that the antenna has an impedance bandwidth of larger than 2.4-10.6 GHz with the mutual coupling less than 20 dB in WLAN band and 18dB in 3.1-10.6GHz, making the antenna a good candidate for portable applications.

1. Foschini, G. J., "On limits of wireless communications in a fading environment when using multiple antennas," Wireless Pers. Commun., Vol. 6, No. 3, 311-335, 1998.
doi:10.1023/A:1008889222784 Google Scholar

2. Kaiser, T., Z. Feng, and E. Dimitrov, "An overview of ultra-wide-band systems with MIMO," Proc. IEEE, Vol. 97, No. 2, 285-312, Feb. 2009.
doi:10.1109/JPROC.2008.2008784 Google Scholar

3. 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

4. Sharawi, M. S., A. B. Numan, and D. N. Alo, "Isolation improvement in a dual-band dual-element MIMO antenna system using capacitively loaded loops," Progress In Electromagnetics Research, Vol. 134, 247-266, 2013.
doi:10.2528/PIER12090610 Google Scholar

5. Wi, H., B. Kim, W. Jung, and B. Lee, "Multiband handset antenna analysis including LTE band MIMO service," Progress In Electromagnetics Research, Vol. 138, 661-673, 2013.
doi:10.2528/PIER13022408 Google Scholar

6. Zhao, L., L. K. Yeung, and K.-L. Wu, "A coupled resonator decoupling network for two-element compact antenna arrays in mobile terminals," IEEE Transactions on Antennas and Propagation, Vol. 62, No. 5, 2767-2776, May 2014.
doi:10.1109/TAP.2014.2308547 Google Scholar

7. Li, W., W. Lin, and G. Yang, "A compact MIMO antenna system design with low correlation from 1710MHz to 2690 MHz," Progress In Electromagnetics Research, Vol. 144, 59-65, 2014.
doi:10.2528/PIER13111305 Google Scholar

8. Zhang, S., K. Zhao, B. Zhu, Z. Ying, and S. He, "MIMO reference antennas with controllable correlations and total efficiencies," Progress In Electromagnetics Research, Vol. 145, 115-121, 2014.
doi:10.2528/PIER14010507 Google Scholar

9. Coetzee, J. C and Y. Yu, "Port decoupling for small arrays by means of an eigenmode feed network," IEEE Transactions on Antennas and Propagation,, Vol. 56, No. 6, 1587-1593, Jun. 2008.
doi:10.1109/TAP.2008.923301 Google Scholar

10. Zuo, S., Y.-Z. Yin, Z.-Y. Zhang, W.-J. Wu, and J.-J. Xie, "Eigenmode decoupling for MIMO loop-antenna based on 180^o coupler," Progress In Electromagnetics Research Letters, Vol. 26, 11-20, 2011.
doi:10.2528/PIERL11071109 Google Scholar

11. Andersen, J. B. and H. H. Rasmussen, "Decoupling and descattering networks for antennas," IEEE Transactions on Antennas and Propagation, Vol. 24, No. 6, 841-846, Nov. 1976.
doi:10.1109/TAP.1976.1141437 Google Scholar

12. Chang, S., Y.-S. Wang, and S.-J. Chung, "A decoupling technique for increasing the port isolation between strongly coupled antennas," IEEE Transactions on Antennas and Propagation, Vol. 56, No. 12, 3650-3658, Dec. 2008.
doi:10.1109/TAP.2008.2007279 Google Scholar

13. Lui, C.-Y., Y.-S. Wang, and S.-J. Chung, "Two nearby dual-band antennas with high port isolation," IEEE International Symposium on Antennas and Propagation, San Diego, USA, Jul. 5-11, 2008. Google Scholar

14. Yang, F. and Y. R. Samii, "Microstrip antennas integrated with electromagnetic band-gap EBG structures: A low mutual coupling design for array applications," IEEE Transactions on Antennas and Propagation, Vol. 51, No. 10, 2936-2946, Oct. 2003.
doi:10.1109/TAP.2003.817983 Google Scholar

15. Chiu, C. Y., C. H. Cheng, R. D. Murch, and C. R. Rowell, "Reduction of mutual coupling between closely-packed antenna element," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 6, 1732-1738, Jun. 2007.
doi:10.1109/TAP.2007.898618 Google Scholar

16. Zhang, S., B. K. Lau, A. Sunesson, and S. He, "Closely-packed UWB MIMO/diversity antenna with diggerent patterns and polarizations for USB dongle applications," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 9, 4372-4380, Sep. 2012.
doi:10.1109/TAP.2012.2207049 Google Scholar

17. Yoon, H. K., Y. J. Yoon, H. Kim, and C.-H. Lee, "Flexible ultra-wideband polarisation diversity antenna with band-notch function," IET Microwaves, Antennas & Propagation, Vol. 5, No. 12, 1463-1470, Sep. 2011.
doi:10.1049/iet-map.2010.0126 Google Scholar

18. Mohammad, S., A. Nezhad, H. R. Hassani, and A. Foudaz, "A dual-band WLAN/UWB printed wide slot antenna for MIMO/diversity applications," Microwave and Optical Technology Letters, Vol. 55, No. 3, 461-465, 2013.
doi:10.1002/mop.27391 Google Scholar

19. Li, L., S. W. Cheung, and T. I. Yuk, "Compact MIMO antenna for portable devices in UWB applications," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 8, 4257-4264, Aug. 2013.
doi:10.1109/TAP.2013.2263277 Google Scholar

20. Zhang, S., Z. Ying, J. Xiong, and S. He, "Ultrawideband MIMO/diversity antennas with a tree-ike structure to enhance wideband isolation," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 1279{-1282, 2009.
doi:10.1109/LAWP.2009.2037027 Google Scholar

21. Gao, P., S. He, X. Wei, Z. Xu, N. Wang, and Y. Zheng, "Compact printed UWB diversity slot antenna with 5.5-GHz band-notched characteristics," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 376-379, 2014.
doi:10.1109/LAWP.2014.2305772 Google Scholar

22. Pllo, M., E. Antonino-Daviu, M. Ferrando-Bataller, M. Bozzetti, J. M. Molina-Garcia-Pardo, and L. Juan-Llacer, "A broadband pattern diversity annular slot antenna," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 3, 1596-1600, Mar. 2012.
doi:10.1109/TAP.2011.2180314 Google Scholar

23. Song, K., Y.-Z. Yin, X.-B. Wu, and L. Zhang, "Bandwidth enhancement of open slot antenna with a T-shaped stub," Microwave and Optical Technology Letters, Vol. 52, No. 2, 149-151, Feb. 2010.
doi:10.1002/mop.24929 Google Scholar

24. Blanch, S., J. Romeu, and I. Corbella, "Exact representation of antenna system diversity performance from input parameter description," Electronics Letters, Vol. 39, No. 9, 705-707, May 2003.
doi:10.1049/el:20030495 Google Scholar

Mr. Jian Ren

Dr. Dawei Mi

Professor Ying-Zeng Yin