volume | PIER Journals

Abstract

Due to recent developments in wireless communications, frequency reconfigurable antennas have increased in popularity. This paper presents an integrated design for MIMO antennas that uses octagonal ring-shaped with a frequency-tunable dual-band reconfigurable for wireless communication applications. On the ground plane, the designed antenna has four octagonal ring-shaped radiators with a total size 50 x 50 x 1.6 mm³. In the center of each radiator, a varactor diode is employed to control the capacitive reactance of the slot to provide frequency reconfigurability. Between orthogonally positioned antennas, rectangular defective ground gaps are used for isolation purposes as well. Dual-band operation is achieved by linking the varactor to a slot line of radiating rings. The antenna's lower-frequency band resonates at 4.2 GHz, and its upper-frequency band can be tuned from 4.55 to 5.56 GHz (with isolation > 25 dB in the operating bands). The simulated results are found to be highly consistent with the experimental data. As a result, frequency agility, large tuning range, compactness, and planar structure make it appropriate for a wide range of existing and future wireless communication applications.

1. Hussain, R., A. Raza, M. U. Khan, A. Shammim, and M. S. Sharawi, "Miniaturized frequency reconfigurable pentagonal MIMO slot antenna for interweave CR applications," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 29, No. 5, 1-12, 2019.

2. Christodoulou, C. G., "Cognitive radio: The new frontier for antenna design?," IEEE Antennas and Propagation Society, 2009.

3. Valenta, V., R. Marlek, G. Baudoin, M. Villegas, M. Suarez, and F. Robert, "Survey on spectrum utilization in Europe: Measurements, analyses and observations," Proceedings of the 5th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, Vol. 92, 15, 2010.

4. Mitola, J., "Cognitive radio architecture evolution," Proceedings of the IEEE, Vol. 97, No. 4, 626-641, 2009.
doi:10.1109/JPROC.2009.2013012

5. Yang, S.-L. S., A. A. Kishk, and K.-F. Lee, "Frequency reconfigurable U-slot microstrip patch antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 7, 127-129, 2008.
doi:10.1109/LAWP.2008.921330

6. Majid, H. A., M. K. A. Rahim, M. R. Hamid, N. A. Murad, and M. F. Ismail, "Frequency-reconfigurable microstrip patch-slot antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 218-220, 2013.
doi:10.1109/LAWP.2013.2245293

7. Majid, H. A., M. K. A. Rahim, M. R. Hamid, and M. F. Ismail, "Frequency reconfigurable microstrip patch-slot antenna with directional radiation pattern," Progress In Electromagnetic Research, Vol. 144, 319-328, 2014.
doi:10.2528/PIER13102901

8. Rajagopalan, H., J. M. Kovitz, and Y. Rahmat-Samii, "MEMS reconfigurable optimized E-shaped patch antenna design for cognitive radio," IEEE Transactions on Antennas and Propagation, Vol. 62, No. 3, 1056-1064, 2014.
doi:10.1109/TAP.2013.2292531

9. Khidre, A., F. Yang, and A. Z. Elsherbeni, "A patch antenna with a varactor-loaded slot for reconfigurable dual-band operation," IEEE Transactions on Antennas and Propagation, Vol. 63, No. 2, 755-760, 2015.
doi:10.1109/TAP.2014.2376524

10. Ge, L., M. Li, J. Wang, and H. Gu, "Unidirectional dual-band stacked patch antenna with independent frequency reconfiguration," IEEE Antennas and Wireless Propagation Letters, Vol. 16, 113-116, 2017.
doi:10.1109/LAWP.2016.2558658

11. Khan, M. S., A. Iftikhar, A.-D. Capobianco, R. M. Shubair, and B. Ijaz, "Pattern and frequency reconfiguration of patch antenna using PIN diodes," Microwave and Optical Technology Letters, Vol. 59, No. 9, 2180-2185, 2017.
doi:10.1002/mop.30709

12. Lim, J., Z. Jin, C. Song, and T. Yun, "Simultaneous frequency and isolation reconfigurable MIMO PIFA using PIN diodes," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 12, 5939-5946, 2012.
doi:10.1109/TAP.2012.2211552

13. Raza, A., M. U. Khan, R. Hussain, F. A. Tahir, and M. S. Sharawi, "A 2-element reconfigurable MIMO antenna consisting of miniaturized patch elements," IEEE International Symposium on Antennas and Propagation (APSURSI), 655-656, 2016.
doi:10.1109/APS.2016.7696036

14. Xu, Z., Y. Sun, Q. Zhou, Y. Ban, Y. Li, and S. S. Ang, "Reconfigurable MIMO antenna for integrated-metal-rimmed smartphone applications," IEEE Access, Vol. 5, 21223-21228, 2017.
doi:10.1109/ACCESS.2017.2757949

15. Zhao, X. and S. Riaz, "A dual-band frequency reconfigurable MIMO patch-slot antenna based on reconfigurable microstrip feedline," IEEE Access, Vol. 6, 41450-41457, 2018.
doi:10.1109/ACCESS.2018.2858442

16. Hussain, R. and M. S.Sharawi, "Planar four-element frequency agile mimo antenna system with chassis mode reconfigurability," Microwave and Optical Technology Letters, Vol. 57, No. 8, 1933-1938, 2015.
doi:10.1002/mop.29218

17. Hussain, R. and M. S. Sharawi, "Planar meandered-F-shaped 4-element reconfigurable multiple-input-multiple-output antenna system with isolation enhancement for cognitive radio platforms," IET Microwaves Antennas and Propagation, Vol. 10, No. 1, 45-52, 2016.
doi:10.1049/iet-map.2015.0139

18. Soltani, S., P. Lotfi, and R. D. Murch, "A port and frequency reconfigurable MIMO slot antenna for WLAN applications," IEEE Transactions on Antennas and Propagation, Vol. 64, No. 4, 1209-1217, 2016.
doi:10.1109/TAP.2016.2522470

19. Boukarkar, A. and X. Q. Lin, "Miniaturized frequency-tunable self quadruplexing four-element MIMO antenna system," IET Microwaves Antennas and Propagation, Vol. 14, No. 7, 973-979, 2020.
doi:10.1049/iet-map.2020.0065

20. Biswas, A. K. and U. Chakraborty, "Reconfigurable wideband wearable multiple input multiple output antenna with hanging resonator," Microwave and Optical Technology Letters, Vol. 62, No. 3, 1352-1359, 2020.
doi:10.1002/mop.32151

21. Riaz, S., X. Zhao, and S. Geng, "A frequency reconfigurable MIMO antenna with agile feedline for cognitive radio applications," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 30, No. 3, e22100, 2020.
doi:10.1002/mmce.22100

22. Mathur, R. and S. Dwari, "Frequency and port reconfigurable MIMO antenna for UWB/5G/WLAN band IoT applications," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 31, No. 7, 1-11, 2021.
doi:10.1002/mmce.22692

23. Sharma, N. and S.-S. Bhatia, "Metamaterial inspired fidget spinner shaped antenna based on parasitic split ring resonator for multi-standard wireless applications," Journal of Electromagnetic Waves and Applications, Vol. 34, No. 10, 1-20, 2020.
doi:10.1080/09205071.2019.1654412

24. Mark, R., N. Mishra, K. Mandal, P.-P. Sarkar, and S. Das, "Hexagonal ring fractal antenna with dumb bell shaped defected ground structure for multiband wireless applications," AEU-International Journal of Electronics and Communications, Vol. 94, 42-50, 2018.
doi:10.1016/j.aeue.2018.06.039

25. Cheng, D. K., Fundamentals of Engineering Electromagnetics, Prentice-Hall Inc., New Jersey, 1993.

26. Hayt, W., J. Kemmerly, and S. Durbin, Engineering Circuit Analysis, McGraw-Hill, New York, 2007.

27. SMV1763-079LF: Hyperabrupt Junction Tuning Varactors Datasheet.

28. Kareem, Q. H. and M. J. Farhan, "Design a linear and circular polarization MIMO antennas based on compact size configurations with high isolation and stable gain characteristics for C-band and WLAN/WiMAX applications," International Journal of Intelligent Engineering and Systems, Vol. 14, No. 3, 458-467, 2021.
doi:10.22266/ijies2021.0630.38

Dr. Qasim Hadi Kareem

Dr. Malik Jassim Farhan

Dr. Ali Khalid Jasim