volume | PIER Journals

Abstract

A very compact ultra-wideband (UWB) multiple-input-multiple-output (MIMO) ground linearly tapered slot Antenna (LTSA) is presented in this paper. On a cost-effective FR4 substrate, it consists of a ground plane and two microstrip feedlines. Its overall dimension is only 22×26 mm². To miniaturize the dimension of the antenna, two linearly tapered slots on the ground plane act as the main radiator. Then it does not need extra large radiation patch. In particular, a simple embedded three-level stepped slot on the central ground, brings high isolation in the whole UWB band. In addition, two rectangular slots cut in the feedlines widen the impedance bandwidth. Simulated and measured results verify S₁₁<-10 dB and S₁₂<-18 dB at 3.1 GHz-12 GHz and good diversity performance. Therefore, the proposed MIMO antenna has potential for portable devices applications.

1. Gibson, P. J., "The Vivaldi aerial," 1979 Ninth European Microwave Conference, 101-105, IEEE, 1979.
doi:10.1109/EUMA.1979.332681

2. Yngvesson, K. S., T. L. Korzeniowski, Y. S. Kim, E. L. Kollberg, and J. F. Johansson, "The tapered slot antenna — A new integrated element for millimeter-wave applications," IEEE Trans. Microwave Theory Tech., Vol. 37, No. 2, 365-374, 1989.
doi:10.1109/22.20062

3. Wu, C., L. Shen, G. Y. Deng, Y. Shen, and J. Litva, "Experimental study of a wide band LTSA which is fed by an inverted microstrip line (IML)," 1998 Antennas and Propagation Society (AP-S) International Symposium, Vol. 4, 2328-2331, IEEE, 1998.

4. Zhao, N. and W.-P. Tian, "CPW-fed dual-band MIMO antenna with common radiating element," Progress In Electromagnetics Research Letters, Vol. 62, 71-75, 2016.

5. Lim, E. G., Z. Wang, C. U. Lei, Y. Wang, and K. Man, "Ultra wideband antennas — Past and present," Iaeng International Journal of Computer Science, Vol. 37, No. 3, 304-314, 2010.

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

7. Li, Q., A. P. Feresidis, M. Mavridou, and P. S. Hall, "Miniaturized double-layer EBG structures for broadband mutual coupling reduction between UWB monopoles," IEEE Trans. Antennas Propag., Vol. 63, No. 3, 1168-1171, 2015.
doi:10.1109/TAP.2014.2387871

8. Zhu, J. F., S. F. Li, B. T. Feng, L. Deng, and S. X. Yin, "Compact dual-polarized UWB quasi-selfcomplementary MIMO/diversity antenna with band-rejection capability," IEEE Antennas Wireless Propag. Lett., Vol. 15, 905-908, 2016.
doi:10.1109/LAWP.2015.2479622

9. Huang, H., Y. Liu, S. S. Zhang, and S. X. Gong, "Compact polarization diversity ultrawideband MIMO antenna with triple band-notched characteristics," Microwave Opt. Technol. Lett., Vol. 57, 946-953, 2015.
doi:10.1002/mop.28957

10. Roshna, T. K., U. Deepak, V. R. Sajitha, K. Vasudevan, and P. Mohanan, "A compact UWB MIMO antenna with reflector to enhance isolation," IEEE Trans. Antennas Propag., Vol. 63, No. 4, 1873-1877, 2015.
doi:10.1109/TAP.2015.2398455

11. Liu, L., S. W. Cheung, and T. I. Yuk, "Compact MIMO antenna for portable UWB applications with band-notched characteristic," IEEE Trans. Antennas Propag., Vol. 63, No. 5, 1917-1924, 2015.
doi:10.1109/TAP.2015.2406892

12. Qin, H. and Y. F. Liu, "Compact UWB MIMO antenna with ACS-fed structure," Progress In Electromagnetics Research C, Vol. 50, 29-37, 2014.
doi:10.2528/PIERC14033105

13. Deng, J. Y., L. X. Guo, and X. L. Liu, "An ultrawideband MIMO antenna with a high isolation," IEEE Antennas Wireless Propag. Lett., Vol. 15, 182-185, 2016.
doi:10.1109/LAWP.2015.2437713

14. Zhang, S. and G. F. Pedersen, "Mutual coupling reduction for UWB MIMO antennas with a wideband neutralization line," IEEE Antennas Wireless Propag. Lett., Vol. 15, 166-169, 2016.
doi:10.1109/LAWP.2015.2435992

15., http://www.ansoft.com/products/hf/hfss/.

16. Chiu, C. Y., C. H. Cheng, R. D. Murch, and C. R. Rowell, "Reduction of mutual coupling between closely-packed antenna elements," IEEE Trans. Antennas Propag., Vol. 55, No. 6, 1732-1738, 2007.
doi:10.1109/TAP.2007.898618

17. Addaci, R., et al. "Dual-band WLAN multi-antenna system and diversity/MIMO performance evaluation," IEEE Trans. Antennas Propag., Vol. 62, No. 3, 1409-1415, 2014.
doi:10.1109/TAP.2013.2294955

18. Zhu, F.-G., J.-D. Xu, and Q. Xu, "Reduction of mutual coupling between closely-packed antenna elements using defected ground structure," Electron. Lett., Vol. 45, No. 12, 601-602, 2009.
doi:10.1049/el.2009.0985

19. Vaughan, R. G. and J. B. Andersen, "Antenna diversity in mobile communication," IEEE Trans. Veh. Technol., Vol. 36, No. 4, 149-172, 1987.
doi:10.1109/T-VT.1987.24115

20. Wong, K. L., Planar Antennas for Wireless Communications, Wiley-IEEE Press, 2003.

21., Satimo, [online] Available: http://www.satimo.com/.

Prof. Hui-Fen Huang

Dr. Shu-Guang Xiao