In this paper, a compact UWB antenna with a reconfigurable and sharp dual-band notches filter to cancel the interference with some critical applications (5G WLAN, and X-band satellite downlink) is proposed for underlay cognitive radio (CR) applications. The dual notched bands are produced by coupling a pair of π-shaped resonators on both sides of the feed line and by etching a U-slot inside the feed line of the antenna. The proposed UWB filtenna in this configuration has a surface area of 22×31 mm2 and produces simulated (measured) reconfigurable notched frequencies at 5.466 GHz (5.7 GHz) and 7.578 GHz (7.44 GHz) with an impedance bandwidth of 3.024-10.87 GHz (2.825-10.74 GHz). Three PIN diodes are used to switch the presence of the dual-band notch. Two PIN diodes turn ON-OFF simultaneously (D1A & D1B) are inserted within a pair of π-shaped resonators to control the 5G WLAN band notch, and a single diode (D2) is embedded within a quarter wavelength resonator which is located inside the feed line of the antenna for controlling the X-band band notch. The simulation and measured results reveal that the proposed filtenna effectively covers UWB with controlled cancellation for the interference with the intended bands. The realized gain is 4.5 dBi through the passband except in the notched frequencies, where it is decreased to less than -11 dBi in both notch frequencies. In other words, the proposed filtenna has a very high VSWR of greater than 20 at the notched frequencies.
2. Panda, J. R., P. Kakumanu, and R. S. Kshetrimayum, "A wide-band monopole antenna in combination with a UWB microwave band-pass filter for application in UWB communication system," 2010 Annual IEEE India Conference (INDICON), 1-4, 2010. doi:The server didn't respond in time.
3. Federal Communications Commission, "Revision of part 15 of the commission's rules regarding ultra-wideband transmission systems: First report and order,", FCC-02, 2002. doi:10.2528/PIER08022603
4. Fallahi, R., A. A. Kalteh, and M. Roozbahani, "A novel UWB elliptical slot antenna with band-notched characteristics," Progress In Electromagnetics Research, Vol. 82, 127-136, 2008.
5. Liu, H.-W., C.-H. Ku, T.-S.Wang, and C.-F. Yang, "Compact monopole antenna with band-notched characteristic for uwb applications," IEEE Antennas and Wireless Propagation Letters, Vol. 9, 397-400, 2010.
6. Nguyen, T. D., D. H. Lee, and H. C. Park, "Design and analysis of compact printed triple bandnotched uwb antenna," IEEE Antennas and Wireless Propagation Letters, Vol. 10, 403-406, 2011.
7. Ahmad, W. and D. Budimir, "Reconfigurable UWB ltennas with sharp wlan dual bandnotch," 2015 European Microwave Conference (EuMC), 1228-1231, IEEE, 2015.
8. Li, W. T., Y. Q. Hei, W. Feng, and X. W. Shi, "Planar antenna for 3G/bluetooth/WiMax and UWB applications with dual band-notched characteristics," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 61-64, 2012.
9. Tang, T.-C. and K.-H. Lin, "An ultrawideband mimo antenna with dual band-notched function," IEEE Antennas and Wireless Propagation Letters, Vol. 13, 1076-1079, 2014.
10. Lin, Y.-C. and K.-J. Hung, "Compact ultrawideband rectangular aperture antenna and bandnotched designs," IEEE Transactions on Antennas and Propagation, Vol. 54, No. 11, 3075-3081, 2006.
11. Lui, W., C. Cheng, and H. Zhu, "Compact frequency notched ultra-wideband fractal printed slot antenna," IEEE Microwave and Wireless Components Letters, Vol. 16, No. 4, 224-226, 2006.
12. Tawk, Y., J. Costantine, and C. G. Christodoulou, "Reconfigurable filtennas and MIMO in cognitive radio applications," IEEE Transactions on Antennas and Propagation, Vol. 62, No. 3, 1074-1083, 2013.
13. Lin, C.-C., P. Jin, and R. W. Ziolkowski, "Single, dual and tri-band-notched ultrawideband (UWB) antennas using capacitively loaded loop (CLL) resonators," IEEE Transactions on Antennas and Propagation, Vol. 60, No. 1, 102-109, 2011.
14. Alnahwi, F., A. Abdulhameed, H. Swadi, and A. Abdullah, "A compact wide-slot UWB antenna with recongurable and sharp dual-band notches for underlay cognitive radio applications," Turkish Journal of Electrical Engineering & Computer Sciences, Vol. 27, No. 1, 94-105, 2019.
15. Yoon, I.-J., H. Kim, H. Yoon, Y. Yoon, and Y.-H. Kim, "Ultra-wideband tapered slot antenna with band cutoff characteristic," Electronics Letters, Vol. 41, No. 11, 629-630, 2005.
16. Zhu, F., S. Gao, A. T. Ho, R. A. Abd-Alhameed, C. H. See, T. W. Brown, J. Li, G. Wei, and J. Xu, "Multiple band-notched UWB antenna with band-rejected elements integrated in the feed line," IEEE Transactions on Antennas and Propagation, Vol. 61, No. 8, 3952-3960, 2013.
17. Jaglan, N., B. Kanaujia, S. D. Gupta, and S. Srivastava, "Triple band notched UWB antenna design using electromagnetic band gap structures," Progress In Electromagnetics Research C, Vol. 66, 139-147, 2016.
18. Kollipara, V., S. Peddakrishna, and J. Kumar, "Planar EBG loaded UWB monopole antenna with triple notch characteristics," International Journal of Engineering and Technology Innovation, Vol. 11, No. 4, 294, 2021.
19. Chen, H., Y. Ding, and D. S. Cai, "A CPW-fed UWB antenna with WiMAX/WLAN band-notched characteristics," Progress In Electromagnetics Research Letters, Vol. 25, 163-173, 2011.
20. Abbas, A., N. Hussain, J. Lee, S. G. Park, and N. Kim, "Triple rectangular notch UWB antenna using EBG and SRR," IEEE Access, Vol. 9, 2508-2515, 2020.
21. Rekha, V. S. D., P. Pardhasaradhi, B. T. P. Madhav, and Y. U. Devi, "Dual band notched orthogonal 4-element mimo antenna with isolation for UWB applications," IEEE Access, Vol. 8, 145 871-145 880, 2020.
22. Tawk, Y., J. Costantine, and C. Christodoulou, "A varactor-based reconfigurable filtenna," IEEE Antennas and Wireless Propagation Letters, Vol. 11, 716-719, 2012.
23. Kataria, T. K., M. Bastida, J. R. Reyes-Ayona, J. L. O. Cervantes, and A. Corona-Chavez, "Planar differential filtenna for communications," Progress In Electromagnetics Research Letters, Vol. 79, 33-38, 2018.
24. Hu, K.-Z., M.-C. Tang, D. Li, Y. Wang, and M. Li, "Design of compact, single-layered substrate integrated waveguide ltenna with parasitic patch," IEEE Transactions on Antennas and Propagation, Vol. 68, No. 2, 1134-1139, 2019.
25. Hosain, M. M., S. Kumari, and A. K. Tiwary, "Compact filtenna for wlan applications," Journal of Microwaves, Optoelectronics and Electromagnetic Applications, Vol. 18, 70-79, 2019.
26. Ahmad, W., "Integrated filter antennas for wireless transceivers,", Ph.D. Dissertation, University of Westminster, 2017.
27. Haraz, O. and A.-R. Sebak, "UWB antennas for wireless applications," Advancement in Microstrip Antennas with Recent Applications, 125-152, 2013.
28. Azenui, N. C. and H. Yang, "A printed crescent patch antenna for ultrawideband applications," IEEE Antennas and Wireless Propagation Letters, Vol. 6, 113-116, 2007.
29. Balanis, C. A., Antenna Theory: Analysis and Design, John Wiley & Sons, 2015.
30. Hong, J.-S. G. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, 2004.
31. ADS, "Advanced design system,", 2021.
32. CST, "Computer simulation technology based on t method,", 2017.
33., , Skyworks Solutions, Available online at: https://www.skyworksinc.com/-/media/938aa8a86545442389dadffbee0e2741.ashx.
34. Alhegazi, A., Z. Zakaria, N. A. Shairi, M. I. Ibrahim, and S. Ahmed, "A novel reconfigurable UWB filtering-antenna with dual sharp band notches using double split ring resonators," Progress In Electromagnetics Research C, Vol. 79, 185-198, 2017.
35. Oraizi, H. and N. V. Shahmirzadi, "Frequency-and time-domain analysis of a novel UWB recongurable microstrip slot antenna with switchable notched bands," IET Microwaves, Antennas & Propagation, Vol. 11, No. 8, 1127-1132, 2017.