A reconfigurable antenna with on-demand single-band or dual-band rejection capability for ultra-wideband (UWB) applications is presented. A modified monopole structure is integrated with a U-shaped slot and an open-ended slot to realize band-rejection. The antenna operates in four modes: a full UWB (3.1-10.6 GHz) coverage antenna, a UWB antenna with a single-band WiMax or wide local area network (WLAN) rejection, and a UWB antenna with dual-band WiMax/WLAN rejection. On-demand single and dual-band rejections are implemented by controlling two slots using two PIN diodes. Thus, the adopted control technique is quite easy and requires low operating power. Details of the design process and reconfiguration mechanism are presented. The band-rejection performance is explained by return loss and surface current distribution at single-band mode. A prototype is built on a Rogers substrate and tested to validate the performances. The antenna exhibits stable radiation characteristics and almost flat gain responses across the whole band, while significantly gain reduction is achieved at the rejected bands. Therefore, this antenna is suitable for high-performance UWB systems in WiMax/WLAN dense environments with the aim to improve signal quality, system capacity, and communication efficiency.
2. Fontana, R. J., "Recent system applications of short-pulse Ultra-Wideband (UWB) technology," IEEE Transactions on Microwave Theory and Techniques, Vol. 52, No. 9, 2087-2104, 2004.
doi:10.1109/TMTT.2004.834186
3. Ojaroudi, M. and N. Ojaroudi, "Ultra-wideband small rectangular slot antenna with variable band-stop function," IEEE Transactions on Antennas and Propagation, Vol. 62, 490-494, 2014.
doi:10.1109/TAP.2013.2287703
4. Ibrahim, A. A., M. A. Abdalla, and A. Boutejdar, "Resonator switching techniques for notched ultra-wideband antenna in wireless applications," IET Microwaves, Antennas and Propagation, Vol. 9, 1468-1477, 2015.
5. Tripathi, S., A. Mohan, and S. Yadav, "A compact fractal UWB antenna with reconfigurable band notch functions," Microwave and Optical Technology Letters, Vol. 5, 509-514, 2016.
doi:10.1002/mop.29609
6. Oraizi, H. and N. V. Shahmirzadi, "Frequency- and time-domain analysis of a novel UWB reconfigurable microstrip slot antenna with switchable notched bands," IET Microwaves Antennas and Propagation, Vol. 11, 1127-1132, 2017.
doi:10.1049/iet-map.2016.0009
7. Alam, M. S. and A. Abbosh, "Reconfigurable band-rejection antenna for ultra-wideband applications," IET Microwaves, Antennas and Propagation, Vol. 12, No. 2, 195-202, 2018.
doi:10.1049/iet-map.2017.0442
8. Abbosh, A., "Ultra-wideband quasi-yagi antenna using dual-resonant driver and integrated balun of stepped impedance coupled structure," IEEE Transactions on Antennas and Propagation, Vol. 61, 3885-3888, 2013.
doi:10.1109/TAP.2013.2257642
9. Tasouji, N., J. Nourinia, C. Ghobadi, and F. Tofigh, "A novel printed UWB slot antenna with reconfigurable band-notch characteristics," IEEE Antennas and Wireless Propagation Letters, Vol. 12, 922-925, 2013.
doi:10.1109/LAWP.2013.2273452
10. Aghdam and S. Abazari, "A novel UWB monopole antenna with tunable notched behavior using varactor diode," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 1243-1246, 2014.
doi:10.1109/LAWP.2014.2332449
11. Li, T., H. Zhai, L. Li, C. Liang, and Y. Han, "Compact UWB antenna with tunable band-notched characteristic based on microstrip open-loop resonator," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 1584-1587, 2012.
doi:10.1109/LAWP.2012.2234718
12. Yang, H., X. Xi, H. Hou, Y. Zhao, and Y. Yuan, "Design of reconfigurable monopole antenna with switchable dual band-notches for UWB applications," International Journal of Microwave and Wireless Technologies, Vol. 10, 1065-1071, 2018.
doi:10.1017/S175907871800096X
13. Nikolaou, S., N. D. Kingsley, G. E. Ponchak, J. Papapolymerou, and M. M. Tentzeris, "UWB elliptical monopoles with a reconfigurable band notch using MEMS switches actuated without bias lines," IEEE Transactions on Antennas and Propagation, Vol. 57, 2242-2251, 2009.
doi:10.1109/TAP.2009.2024450
14. Xu, J., D. Shen, X. Zhang, and K. Wu, "A compact disc Ultrawideband (UWB) antenna with quintuple band rejections," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 1517-1520, 2012.
15. Ojaroudi, S., Y. Ojaroudi, and N. Ojaroudi, "Novel design of reconfigurable microstrip slot antenna with switchable band-notched characteristic," Microwave and Optical Technology Letters, Vol. 57, 849-853, 2015.
doi:10.1002/mop.28980
16. Aboufoul, T. and A. Alomainy, "Reconfiguring UWB monopole antenna for cognitive radio applications using GaAs FET switches," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 392-394, 2012.
doi:10.1109/LAWP.2012.2193551
17. Gao, G., B. Hu, L. He, S.Wang, and C. Yang, "Investigation of a reconfigurable dual notched UWB antenna by conceptual circuit model and time-domain characteristics," Microwave and Optical Technology Letters, Vol. 59, 1326-1332, 2017.
doi:10.1002/mop.30535
18. Srivastava, G., S. Dwari, and B. K. Kanaujia, "A compact UWB antenna with reconfigurable dual notch bands," Microwave and Optical Technology Letters, Vol. 57, 2737-2742, 2015.
doi:10.1002/mop.29424
19. Horestani, A. K., Z. Shaterian, J. Naqui, and F. Martin, "Reconfigurable and tunable s-shaped split-ring resonators and application in band-notched UWB antennas," IEEE Transactions on Antennas and Propagation, Vol. 64, 3766-3776, 2016.
doi:10.1109/TAP.2016.2585183
20. Liu, X. and M. M. Tentzeris, "Optically controlled reconfigurable band-notched UWB antenna for cognitive radio systems," Electronics Letters, Vol. 50, 1502-1504, 2014.
doi:10.1049/el.2013.1835
21. Zhao, D., L. Lan, Y. Han, and F. Liang, "Optically controlled reconfigurable band-notched UWB antenna for cognitive radio applications," IEEE Photonics Technology Letters, Vol. 26, 2173-2176, 2014.
doi:10.1109/LPT.2014.2349961
22. Salim, M. and A. Pourziad, "A novel reconfigurable spiral-shaped monopole antenna for biomedical applications," Progress In Electromagnetics Research, Vol. 57, 79-84, 2015.
doi:10.2528/PIERL15083103
23. 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, 1056-1064, 2014.
doi:10.1109/TAP.2013.2292531
24. Row, J. S. and J. F. Tsai, "Frequency reconfigurable microstrip patch antennas with circular polarization," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 1112-1115, 2014.
25. Thomas, K. G. and M. Sreenivasan, "A simple ultrawideband planar rectangular printed antenna with band dispensation," IEEE Transactions on Antennas and Propagation, Vol. 58, 27-34, 2010.
doi:10.1109/TAP.2009.2036279