volume | PIER Journals

Abstract

To improve the requirements of stopband rejection in ultra-wideband (UWB) filters, a modified T-shaped resonator is proposed and optimized based on multimode resonator theory. The conventional resonator is enhanced by loading open-circuit branches and introducing circular slots to create transmission zeros, while asymmetric coupling lines and a ``ram's horn'' structure are employed to realize dual trapping at 6.3 GHz and 6.8 GHz. Additionally, a defective ground structure is incorporated to further improve the filter's performance. The proposed filter exhibits a passband range of 4.1 GHz to 10.7 GHz, with a minimum insertion loss of -0.2 dB and a return loss greater than 10 dB. The filter demonstrates excellent out-of-band rejection, with trap depths of -28.4 dB and -50 dB at the trapped frequencies of 6.3 GHz and 6.8 GHz, respectively.

1. Zaki, Amira Ibrahim, Ehab F. Badran, and Said E. El-Khamy, "Two novel space-time coding techniques designed for UWB MISO systems based on wavelet transform," PLoS ONE, Vol. 11, No. 12, e0167990, 2016.

2. Federal Communications Commission "Revision of part 15 of the commission's rules regarding ultra-wideband transmission systems," First Report and Order, FCC 02-48, Washington, DC, 2002.
doi:The server didn't respond in time.

3. Alqaisy, Mushtaq A., C. Chakrabraty, J. Ali, A. R. H. Alhawari, and Tale Saeidi, "Reconfigurable bandwidth and tunable dual-band bandpass filter design for Ultra-Wideband (UWB) applications," Electromagnetics, Vol. 36, No. 6, 366-378, 2016.

4. Ghazali, Abu Nasar and Avantika Singh, "Broadside coupled UWB filter with dual notched band and extended upper stopband," 2014 International Conference on Devices, Circuits and Communications (ICDCCom), 1-5, Ranchi, India, 2014.

5. Ghazali, Abu Nasar, Mohd Sazid, and Srikanta Pal, "A miniaturized microstrip‐to‐CPW transition based UWB‐BPF with sharp roll‐off and minimum insertion loss," Microwave and Optical Technology Letters, Vol. 58, No. 2, 289-293, 2016.

6. Ishida, H. and K. Araki, "A design of tunable UWB filters," 2004 International Workshop on Ultra Wideband Systems Joint with Conference on Ultra Wideband Systems and Technologies. Joint UWBST & IWUWBS 2004 (IEEE Cat. No.04EX812), 424-428, Kyoto, Japan, 2004.

7. Sangam, Ramanand Sagar and Rakhesh Singh Kshetrimayum, "Notched UWB filter using exponential tapered impedance line stub loaded microstrip resonator," The Journal of Engineering, Vol. 2018, No. 9, 768-772, 2018.

8. El Bakali, Hamza El Omari, Hanae Elftouh, Abdelkrim Farkhsi, and Alia Zakriti, "A compact UWB bandpass filter with WLAN band rejection using hybrid technique," Procedia Manufacturing, Vol. 46, 922-926, 2020.

9. Zhang, Ting, Fei Xiao, Jingfu Bao, and Xiaohong Tang, "A compact UWB bandpass filter with a notched band using a multistubs loaded resonator," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 27, No. 1, e21054, 2016.

10. Zhu, Lei, Sheng Sun, and W. Menzel, "Ultra-wideband (UWB) bandpass filters using multiple-mode resonator," IEEE Microwave and Wireless Components Letters, Vol. 15, No. 11, 796-798, 2005.

11. Udhayanan, Senathipathi and Krishnan Shambavi, "Compact single notch UWB bandpass filter with metamaterial and SIW technique," Progress In Electromagnetics Research Letters, Vol. 117, 41-46, 2024.
doi:10.2528/PIERL23113004

12. Yang, Shuhui, Fanglu Tong, Yinchao Chen, Hongxing Chen, and Jiajie Chu, "Highly compact UWB-BPF with a wide notch-band using a rectangular ring structure and two Y-shaped open stub resonators," AEU --- International Journal of Electronics and Communications, Vol. 161, 154556, 2023.

13. Peng, Huaxia, Yufeng Luo, and Junding Zhao, "Compact microstrip UWB bandpass filter with two band-notches for UWB applications," Progress In Electromagnetics Research Letters, Vol. 45, 25-30, 2014.

14. Zhu, Lei, Huizheng Bu, and Ke Wu, "Aperture compensation technique for innovative design of ultra-broadband microstrip bandpass filter," 2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017), Vol. 1, 315-318, Boston, MA, USA, Jun. 2000.

15. Li, Rui and Lei Zhu, "Compact UWB bandpass filter using stub-loaded multiple-mode resonator," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 1, 40-42, 2007.

16. Chen, Hui and Yu-Xing Zhang, "A novel and compact UWB bandpass filter using microstrip fork-form resonators," Progress In Electromagnetics Research, Vol. 77, 273-280, 2007.

17. Park, Jong-Im, Chul-Soo Kim, Juno Kim, Jun-Seok Park, Yongxi Qian, Dal Ahn, and T. Itoh, "Modeling of a photonic bandgap and its application for the low-pass filter design," 1999 Asia Pacific Microwave Conference. APMC'99. Microwaves Enter the 21st Century. Conference Proceedings (Cat. No.99TH8473), Vol. 2, 331-334, Singapore, Nov. 1999.

Dr. Mingming Gao

Dr. Hanci Jiang

Ms. Yunshu Yang

Dr. Xinyue Zhang

Dr. Ya He