1. Federal Communications Commission (FCC) "Revision of part 15 of the commission's rules regarding ultra-wideband transmission systems first report and order,", ET Docket 98-153 FCC 02-48, adopted February 2002; released April 2002.
doi:10.1109/TAP.2009.2019908        Google Scholar

2. See, T. S. P. and Z. N. Chen, "An ultrawideband diversity antenna," IEEE Transactions on Antennas and Propagation, Vol. 57, No. 6, 1597-1605, 2009.
doi:10.1049/el:20061564        Google Scholar

3. Tran, V. P. and A. Sibille, "Spatial multiplexing in UWB MIMO communications," Electronics Letters, Vol. 42, No. 16, 931-932, 2006.
doi:10.1109/LAWP.2015.2422571        Google Scholar

4. Kang, L., H. Li, X. Wang, et al. "Compact offset microstrip-fed MIMO antenna for band-notched UWB applications," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 1754-1757, 2015.        Google Scholar

5. Mohanty, A. and S. Sahu, "High isolation two-port compact MIMO fractal antenna with Wi-Max and X-band suppression characteristics," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 30, No. 1, 1096-110, 2019.
doi:10.1002/mop.31092        Google Scholar

6. Rajkumar, S., K. T. Selvan, and P. H. Rao, "Compact 4 element Sierpinski Knopp fractal UWB MIMO antenna with dual band notch," Microwave and Optical Technology Letters, Vol. 60, No. 4, 1023-1030, 2018.
doi:10.1109/LAWP.2015.2412659        Google Scholar

7. Tripathi, S., A. Mohan, and S. Yadav, "A compact Koch fractal UWB MIMO antenna with WLAN band-rejection," IEEE Antennas and Wireless Propagation Letters, Vol. 14, 1565-1568, 2015.
doi:10.1109/LAWP.2016.2604843        Google Scholar

8. Khan, M. S., A. Capobianco, S. M. Asif, et al. "A compact CSRR-enabled UWB diversity antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 16, 808-812, 2017.
doi:10.1109/TAP.2018.2803134        Google Scholar

9. Chandel, R., A. K. Gautam, and K. Rambabu, "Tapered fed compact UWB MIMO-diversity antenna with dual band-notched characteristics," IEEE Transactions on Antennas and Propagation, Vol. 66, No. 4, 1677-1684, 2018.
doi:10.1049/el.2019.2871        Google Scholar

10. Kumar Saurabh, A., P. Singh Rathore, and M. Kumar Meshram, "Compact wideband four-element MIMO antenna with high isolation," Electronics Letters, Vol. 56, No. 3, 117-119, 2020.
doi:10.1109/TAP.2011.2180314        Google Scholar

11. Gallo, M., E. Antonino-Daviu, M. Ferrando-Bataller, et al. "A broadband pattern diversity annular slot antenna," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 3, 1596-1600, 2012.
doi:10.1109/LAWP.2014.2305772        Google Scholar

12. Gao, P., S. He, X. Wei, et al. "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/TAP.2013.2263277        Google Scholar

13. Liu, 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. 3, 4257-4264, 2013.        Google Scholar

14. Ren, J., W. Hu, Y. Yin, et al. "Compact printed MIMO antenna for UWB applications," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 1517-1520, 2014.
doi:10.1109/LAWP.2009.2037027        Google Scholar

15. Zhang, S., Z. Ying, J. Xiong, et al. "Ultrawideband MIMO/diversity antennas with a tree-like structure to enhance wideband isolation," IEEE Antennas and Wireless Propagation Letters, Vol. 8, 1279-1282, 2009.
doi:10.1109/TAP.2011.2173444        Google Scholar

16. Yun, J. X. and R. G. Vaughan, "Multiple element antenna efficiency and its impact on diversity and capacity," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 2, 529-539, 2012.
doi:10.1109/TAP.1969.1139526        Google Scholar

17. Kahn, W., "Active re ection coefficient and element efficiency in arbitrary antenna arrays," IEEE Transactions on Antennas and Propagation, Vol. 17, No. 5, 653-654, 1969.
doi:10.3390/fractalfract4010003        Google Scholar

18. Anguera, J., A. Andújar, J. Jayasinghe, V. V. S. S. S. Chakravarthy, P. S. R. Chowdary, J. L. Pijoan, T. Ali, and C. Cattani, "Fractal antennas: An historical perspective," Fractal and Fractional, Vol. 4, No. 1, 3, 2020.
doi:10.1109/LAWP.2011.2109030        Google Scholar

19. Oraizi, H. and S. Hedayati, "Miniaturized UWB monopole microstrip antenna design by the combination of Giusepe Peano and Sierpinski Carpet fractals," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 67-70, 2011.
doi:10.1109/TAP.2011.2128294        Google Scholar

20. Azari, A., "A new super wideband fractal microstrip antenna," IEEE Transactions on Antennas and Propagation, Vol. 59, No. 5, 1724-1727, May 2011.
doi:10.1109/LAWP.2012.2189749        Google Scholar

21. Zheng, S., Y. Yin, J. Fan, X. Yang, B. Li, and W. Liu, "Analysis of miniature frequency selective surfaces based on fractal antenna-filter-antenna arrays," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 240-243, 2012.
doi:10.1109/LAWP.2010.2053834        Google Scholar

22. Hong, T., S. Gong, Y. Liu, and W. Jiang, "Monopole antenna with quasi-fractal slotted ground plane for dual-band applications," IEEE Antennas and Wireless Propagation Letters, Vol. 9, 595-598, 2010.        Google Scholar