volume | PIER Journals

Abstract

A hexagon-shaped fractal ultra-wideband (UWB) Multiple Input Multiple Output (MIMO) antenna is proposed in this paper for S (2 GHz to 4 GHz) and C (4 GHz to 8 GHz) band applications. The proposed design consists of two microstrip fed radiating elements of dimension 82 × 44 × 1.6 mm³. One rectangular stub and four resistance loaded stubs are introduced in the ground plane to reduce the mutual coupling between the radiators. These decoupling structures reduce the notches and enhance the isolation from -5 dB to -20 dB for the entire frequency range from 2.3 to 7.4 GHz. The performance characteristics and diversity parameters are also investigated which show the values of ECC < 0.004, DG > 9.96, CCL < 0.4 and MEG < 3 dB, and it is concluded that the proposed design is a good candidate for UWB MIMO. The proposed design is fabricated and tested which shows the close agreement between the simulated and measured results.

1. Mark, R., N. Rajak, K. Mandal, and S. Das, "Isolation and gain enhancement using metamaterial-based superstrate for MIMO applications," Radioengineering, Vol. 28, No. 4, 689-695, 2019.
doi:10.13164/re.2019.0689 Google Scholar

2. Bhattacharya, A. and B. Roy, "Investigations on an extremely compact MIMO antenna with enhanced isolation and bandwidth," Microw. Opt. Technol. Lett., 1-7, 2019. Google Scholar

3. Tripathi, S., A. Mohan, and S. K. Yadav, "A compact MIMO/diversity antenna with WLAN band- notch characteristics for portable UWB applications," Progress In Electromagnetics Research C, Vol. 77, 29-38, 2017.
doi:10.2528/PIERC17042002 Google Scholar

4., FCC Online Table of Frequency Allocations 47 C.F.R. 2.106 Revised on July 1, 2022.

5. Kumar, A., A. Q. Ansari, B. Kanaujia, J. Kishor, and N. Tewari, "Design of triple-band MIMO antenna with one band-notched characteristic," Progress In Electromagnetics Research C, Vol. 86, 41-53, 2018.
doi:10.2528/PIERC18051902 Google Scholar

6. Sharawi, M. S., "Printed multi-band MIMO antenna systems and their performance metrics [wireless corner]," IEEE Antennas and Propagation Magazine, Vol. 55, No. 5, 218-232, Oct. 2013.
doi:10.1109/MAP.2013.6735522 Google Scholar

7. Sree, G. N. J. and S. Nelaturi, "Design and experimental verification of fractal based MIMO antenna for lower sub 6-GHz 5G applications," AEU --- International Journal of Electronics and Communications, Vol. 137, 153797, 2021, ISSN1434-8411.
doi:10.1016/j.aeue.2021.153797 Google Scholar

8. Tripathi, S., A. Mohan, and S. Yadav, "A compact octagonal fractal UWB MIMO antenna with WLAN band-rejection," Microw. Opt. Technol. Lett., Vol. 57, 1919-1925, 2015.
doi:10.1002/mop.29220 Google Scholar

9. Khan, S. B., S. Ghafoor, and K. K. Qureshi, "Mutual coupling reduction using ground stub and EBG in a compact wideband MIMO-antenna," IEEE Access, Vol. 9, 40972-40979, 2021.
doi:10.1109/ACCESS.2021.3065441 Google Scholar

10. Sakli, H., C. Abdelhamid, C. Essid, and N. Sakli, "Metamaterial-based antenna performance enhancement for MIMO system applications," IEEE Access, Vol. 9, 38546-38556, 2021.
doi:10.1109/ACCESS.2021.3063630 Google Scholar

11. Liu, R., X. An, H. Zheng, M. Wang, Z. Gao, and E. Li, "Neutralization line decoupling tri-band Multiple-Input Multiple-Output antenna design," IEEE Access, Vol. 8, 27018-27026, 2020.
doi:10.1109/ACCESS.2020.2971038 Google Scholar

12. Vasu Babu, K. and B. Anuradha, "Design of Wang shape neutralization line antenna toreduce the mutual coupling in MIMO antennas," Analog. Integr. Circ. Sig. Process., Vol. 101, 67-76, 2019.
doi:10.1007/s10470-019-01397-y Google Scholar

13. Zhang, Y.-M., S. Zhang, J.-L. Li, and G. F. Pedersen, "A transmission-line-based decoupling method for MIMO antenna arrays," IEEE Transactions on Antennas and Propagation, Vol. 67, No. 5, 3117-3131, May 2019.
doi:10.1109/TAP.2019.2900406 Google Scholar

14. Gorai, A., A. Dasgupta, and R. Ghatak, "A compact quasi-self-complementary dual band notched UWB MIMO antenna with enhanced isolation using Hilbert fractal slot," AEU --- International Journal of Electronics and Communications, Vol. 94, 36-41, 2018, ISSN 1434-8411.
doi:10.1016/j.aeue.2018.06.035 Google Scholar

15. Abdelgwad, A. H. and M. Ali, "Mutual coupling reduction of a two-element MIMO antenna system using defected ground structure," 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 1909-1910, 2020.
doi:10.1109/IEEECONF35879.2020.9330404 Google Scholar

16. Chouhan, S., M. Gupta, and D. K. Panda, "Dual band compact antenna with series of hexagonal cut and coupling structure for isolation enhancement," 2017 7th International Conference on Cloud Computing, Data Science & Engineering-Confluence, 750-753, 2017.
doi:10.1109/CONFLUENCE.2017.7943250 Google Scholar

17. Gurjar, R., D. K. Upadyay, B. Kanaujia, and A. Kumar, "A compact U-shaped UWB-MIMO antenna with novel complementary modified Minkowski fractal for isolation enhancement," Progress In Electromagnetics Research C, Vol. 107, 81-96, 2021.
doi:10.2528/PIERC20091809 Google Scholar

18. Rajkumar, S., K. T. Selvan, and P. H. Rao, "Compact 4 element Sierpinski Knopp fractal UWB MIMO antenna with dualband notch," Microw. Opt. Technol. Lett., Vol. 60, 1023-1030, 2018.
doi:10.1002/mop.31092 Google Scholar

19. Weng, W. C. and C. L. Hung, "H-Fractal antenna for multiband applications," IEEE Antennas Wirel. Propag. Lett., Vol. 13, 1705-1708, 2014.
doi:10.1109/LAWP.2014.2351618 Google Scholar

20. Patra, P. K. and M. K. Das, "Modified ground with 50 Ω step fed WLAN notch 2 x 2 MIMO UWB antenna," Int. JRF Microw. Comput. Aided Eng., 2019. Google Scholar

21. 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, 1677-1684, 2018.
doi:10.1109/TAP.2018.2803134 Google Scholar

22. Banerjee, J., A. Gorai, and R. Ghatak, "Design and analysis of a compact UWB MIMO antenna incorporating fractal inspired isolation improvement and band rejection structures," International Journal of Electronics and Communications, 2020. Google Scholar

23. Chouhan, S., D. K. Panda, V. S. Kushwah, and S. Singhal, "Spider-shaped fractal MIMO antenna for LAN/WiMAX/Wi-Fi/Bluetooth/C-band applications," AEU --- International Journal of Electronics and Communications, Vol. 110, 152871, 2019, ISSN 1434-8411.
doi:10.1016/j.aeue.2019.152871 Google Scholar

24. Rajkumar, S., N. V. Sivaraman, S. Murali, and K. T. Selvan, "Heptaband swastik arm antenna for MIMO applications," IET Microw. Antennas Propag., Vol. 11, No. 9, 1255-1261, 2017.
doi:10.1049/iet-map.2016.1098 Google Scholar

25. Sharma, A. and A. Biswas, "Wideband multiple-input-multiple-output dielectric resonator antenna," IET Microw. Antennas Propag., Vol. 11, No. 4, 496-502, 2017.
doi:10.1049/iet-map.2016.0515 Google Scholar

26. Mei, P., Y.-M. Zhang, and S. Zhang, "Decoupling of a wideband dual-polarized large-scale antenna array with dielectric stubs," IEEE Transactions on Vehicular Technology, Vol. 70, No. 8, 7363-7374, Aug. 2021.
doi:10.1109/TVT.2021.3089832 Google Scholar

27. Hakim, M. L., M. J. Uddin, and M. J. Hoque, "28/38 GHz dual-band microstrip patch antenna with DGS and stub-slot configurations and its 2 x 2 MIMO antenna design for 5G wireless communication," 2020 IEEE Region 10 Symposium (TENSYMP), 56-59, 2020.
doi:10.1109/TENSYMP50017.2020.9230601 Google Scholar

28. Yamna, M. B. and H. Sakli, "UWB-MIMO antenna with high isolation using stub dedicated to connected objects," 2020 20th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 297-300, 2020. Google Scholar

29. Mu, W., H. Lin, Z. Wang, C. Li, M. Yang, W. Nie, and J. Wu, "A flower-shaped miniaturized UWB-MIMO antenna with high isolation," Electronics, Vol. 11, No. 14, 2190, 2022.
doi:10.3390/electronics11142190 Google Scholar

30. Tang, M.-C., Z. Chen, H. Wang, M. Li, B. Luo, J. Wang, Z. Shi, and R. W. Ziolkowski, "Mutual coupling reduction using meta-structures for wideband, dual-polarized, and high-density patch arrays," IEEE Transactions on Antennas and Propagation, Vol. 65, No. 8, 3986-3998, 2017.
doi:10.1109/TAP.2017.2710214 Google Scholar

31. Park, J.-D., M. Rahman, and H. N. Chen, "Isolation enhancement of wide-band MIMO array antennas utilizing resistive loading," IEEE Access, Vol. 7, 81020-81026, 2019.
doi:10.1109/ACCESS.2019.2923330 Google Scholar

32. Sharawi, M. S., "Printed multiband MIMO antenna systems and their performance metrics," IEEE Antennas and Propagation Magazine, Vol. 55, No. 5, 219-232, 2013.
doi:10.1109/MAP.2013.6735522 Google Scholar

33. Yadav, D., M. Abegaonkar, S. Koul, V. Tiwari, and D. Bhatnagar, "Two element band-notched UWB MIMO antenna with high and uniform isolation," Progress In Electromagnetics Research M, Vol. 63, 119-129, 2017. Google Scholar

34. Zhao, X., S. P. Yeo, and L. C. Ong, "Planar UWB MIMO antenna with pattern diversity and isolation improvement for mobile platform based on the theory of characteristic modes," IEEE Transactions on Antennas and Propagation, Vol. 66, No. 1, 420-425, 2018.
doi:10.1109/TAP.2017.2768083 Google Scholar

35. Singh, H. V. and S. Tripathi, "Compact UWB MIMO antenna with crossshaped unconnected ground stub using characteristic mode analysis," Microw. Opt. Technol. Lett., Vol. 61, No. 7, 1874-1881, Jul. 2019.
doi:10.1002/mop.31792 Google Scholar

36. Sohi, A. K. and A. Kaur, "A complementary Sierpinski gasket fractal antenna array integrated with a complementary Archimedean defected ground structure for portable 4G/5G UWB MIMO communication devices," Microw. Opt. Technol. Lett., 1-11, 2020. Google Scholar

37. Bakale, R. S., A. Nandgaonkar, S. Deosarkar, and M. Munde, "Design of ultra-wideband MIMO antenna with dual band elimination characteristics and low mutual coupling," Progress In Electromagnetics Research C, Vol. 123, 237-251, 2022.
doi:10.2528/PIERC22062202 Google Scholar

38. Sharma, M., P. C. Vashist, I. Alsukayti, N. Goyal, D. Anand, and A. H. Mosavi, "A wider impedance bandwidth dual filter symmetrical MIMO antenna for high-speed wideband wireless applications," Symmetry, Vol. 14, 29, 2022. Google Scholar

39. Sharma, M., S. Singh, and R. Varma, "Computational design, analysis and characterization of beetle shaped high isolation multiple-input-multiple-output reconfigurable monopole-antenna with dual band filters for wireless applications," Wireless Pers. Commun., Vol. 119, 1029-1049, 2021.
doi:10.1007/s11277-021-08248-y Google Scholar

Ms. Aditi Sharma

Mr. Sumit Kumar Gupta

Dr. Robert Mark

Dr. Bhawna Shukla

Dr. Soma Das