volume | PIER Journals

Abstract

This paper presents a planar, compact 8-element frequency-reconfigurable multiple-input-multiple-output (MIMO) antenna system. The proposed design can be utilized as a communication antenna for cognitive radio (CR) front-end applications. The proposed antenna design contains 8 elements on a single substrate board. Frequency reconfigurablility is achieved using varactor diode in the middle of each antenna element by varying the capacitive reactance of the slot. The proposed antenna system provides very wide frequency tunable characteristics from 1.6 to 2.48 GHz. The proposed design covers several well-known frequency bands like LTE, GSM-1800, PCS-1900, WLAN along with several others. Moreover, rectangular defected ground slots are used between vertically placed antenna elements to enhance the isolation. The complete antenna system is realized on single FR-4 substrate of dimensions 120×60×1.56 mm³. The performance of proposed design is demonstrated by presenting both the simulated and measured results with close agreement achieved between the two which validates the proposed design.

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

2. Christodoulou, C. G., "Cognitive radio: The new frontier for antenna design?," IEEE Antennas Propag. Soc. Feature Art., [Online] Available: www.ieeeaps.org.

3. Hung, C. and T. Chiu, "Dual-band reconfigurable antenna design using slot-line with branch edge," IEEE Trans. Antennas Propag., Vol. 63, No. 2, 508-516, Feb. 2015.
doi:10.1109/TAP.2014.2382121

4. Sharma, S. and C. C. Tripathi, "Frequency reconfigurable U-slot antenna for SDR application," Progress In Electromagnetics Research Letters, Vol. 55, 129-136, 2015.
doi:10.2528/PIERL15071304

5. Han, L., C.Wang, W. Zhang, R. Ma, and Q. Zeng, "Design of frequency- and pattern-reconfigurable wideband slot antenna," Int. J. Antennas Propag., Vol. 2018, Art. ID: 3678018, 1-7, 2018.

6. Majid, H. A., M. K. A. Rahim, M. R. Hamid, and M. F. Ismail, "Frequency and pattern reconfigurable slot antenna," IEEE Trans. Antennas Propag., Vol. 62, No. 10, 5339-5343, Oct. 2014.
doi:10.1109/TAP.2014.2342237

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 Electromagnetics Research, Vol. 144, 319-328, 2014.
doi:10.2528/PIER13102901

8. Gholamrezaei, M., F. Geran, and R. A. Sadeghzadeh, "Completely independent multi-ultrawideband and multi-dual-band frequency reconfigurable annular sector slot antenna (FRASSA)," IEEE Trans. Antennas Propag., Vol. 65, No. 2, 893-898, Feb. 2017.
doi:10.1109/TAP.2016.2632726

9. Sharma, S. and C. C. Tripathi, "A novel reconfigurable antenna with spectrum sensing mechanism for CR system," Progress In Electromagnetics Research C, Vol. 72, 187-196, 2017.
doi:10.2528/PIERC17010901

10. Tawk, Y., J. Costantine, and C. Christodoulou, "Reconfigurable filtennas and MIMO in cognitive radio applications," IEEE Trans. Antennas Propag., Vol. 62, No. 3, 1074-1084, Mar. 2014.
doi:10.1109/TAP.2013.2280299

11. Lim, J.-H., Z.-J. Jin, C.-W. Song, and T.-Y. Yun, "Simultaneous frequency and isolation reconfigurable MIMO PIFA using pin diodes," IEEE Trans. Antennas Propag., Vol. 60, No. 12, 5939-5946, Dec. 2012.
doi:10.1109/TAP.2012.2211552

12. Cao, Y., S. W. Cheung, and T. I. Yuk, "Frequency-reconfigurable multiple-input-multiple-output monopole antenna with wide-continuous tuning range," IET Microw. Antennas Propag., Vol. 10, No. 12, 1322-1331, May 2016.
doi:10.1049/iet-map.2015.0295

13. Hussain, R. and M. S. Sharawi, "A cognitive radio reconfigurable MIMO and sensing antenna system," IEEE Antennas Wireless Propag. Lett., Vol. 14, 257-260, 2015.
doi:10.1109/LAWP.2014.2361450

14. 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 Microw. Antennas Propag., Vol. 10, No. 1, 45-52, Sep. 2015.
doi:10.1049/iet-map.2015.0139

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

16. Xu, Z. Q., Y. T. Sun, Q. Q. Zhou, Y. L. Ban, Y. X. 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

17. Sharawi, M. S., "A 5-GHz 4/8-element MIMO antenna system for IEEE 802.11ac devices," Microw. Opt. Technol. Lett., Vol. 55, No. 7, 1589-1594, Jul. 2013.
doi:10.1002/mop.27611

18. Qin, Z., W. Geyi, M. Zhang, and J. Wang, "Printed eight-element MIMO system for compact and thin 5G mobile handset," Electron. Lett., Vol. 52, No. 6, 416-418, Mar. 2016.
doi:10.1049/el.2015.3960

19. Sharawi, M. S., Printed MIMO Antenna Engineering, Artech House, 2014.

Dr. Sharjeel Riaz

Dr. Xiongwen Zhao