volume | PIER Journals

Abstract

In this article, a compact ultra-wideband (UWB) band-pass filter (BPF) with wide upper stopband is presented. The filter is designed with a UWB response from 3.2 GHz to 10.8 GHz with low insertion loss of 0.9 dB and less than 0.19 dB at the center frequency (6.67 GHz). The filter is also designed with a broad upper stopband with high rejection level of 20 dB. The group delay is flat with maximum of 0.4 ns. The proposed UWB filter is constructed by using a pair of parallel coupled lines and two ring resonators. In this design, the ring resonators provide two new excited modes to widen the desired UWB passband and also create two tunable transmission zeros to achieve a wide stopband. Good agreement is observed between simulated and measured performances of the UWB filter.

1. Federal Communications Commission (FCC) "Revision of Part 15 of the Commission’s Rules Regarding Ultra-Wideband Transmission Systems,", First Report and Order, FCC02. V48, 2002.
doi:10.2528/PIER07082302 Google Scholar

2. Chen, H. and Y. X. Zhang, "A novel and compact UWB bandpass filter using microstrip fork-form resonators," Progress In Electromagnetics Research, Vol. 77, 273-280, 2007.
doi:10.2528/PIER13120409 Google Scholar

3. Peng, H., J. D. Zhao, and B. Wang, "Compact microstrip UWB bandpass filter with triple-notched bands and wide upper stopband," Progress In Electromagnetics Research, Vol. 144, 185-191, 2014.
doi:10.2528/PIER13053007 Google Scholar

4. Khalid, S., W. P. Wen, and L. Y. Cheong, "A novel synthesis procedure for ultrawideband (UWB) bandpass filters," Progress In Electromagnetics Research, Vol. 141, 249-266, 2013.
doi:10.1109/LMWC.2009.2013735 Google Scholar

5. Wong, S. W. and L. Zhu, "Quadruple-mode UWB band-pass filter with improved out-of-band rejection," IEEE Microwave and Wireless Components Letters, Vol. 19, No. 3, 152-154, 2009.
doi:10.1109/LMWC.2005.859011 Google Scholar

6. Zhu, L., S. Sun, and W. Menzel, "Ultra-wideband (UWB) band-pass filters using multiple-mode resonator," IEEE Microwave and Wireless Components Letters, Vol. 15, No. 11, 796-798, 2005.
doi:10.1109/LMWC.2013.2287231 Google Scholar

7. Li, X. P. and X. Ji, "Novel compact UWB band-pass filters design with cross-coupling between short-circuited stubs," IEEE Microwave and Wireless Components Letters, Vol. 24, No. 1, 2325, 2014.
doi:10.1109/LMWC.2013.2287231 Google Scholar

8. Liu, Y., C. H. Liang, and Y. J. Wang, "Ultra-wideband band-pass filter using hybrid quasi-lumped elements and defected ground structure," IET Electronics Letters, Vol. 45, No. 17, 899-900, 2009.
doi:10.1109/TMTT.2007.908671 Google Scholar

9. Tang, C. W. and M. G. Chen, "A microstrip ultra-wideband band-pass filter with cascaded broadband band-pass and band-stop filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 55, No. 11, 2412-2418, 2007.
doi:10.1109/LMWC.2010.2047469 Google Scholar

10. Lee, J. K. and Y. S. Kim, "Ultra-wideband band-pass filter with improved upper stopband performance using defected ground structure," IEEE Microwave and Wireless Components Letters, Vol. 20, No. 6, 316-318, 2010.
doi:10.2528/PIER10070403 Google Scholar

11. Huang, J.-Q. and Q.-X. Chu, "Compact UWB band-pass filter utilizing modified composite right/left-handed structure with cross coupling," Progress In Electromagnetics Research, Vol. 107, 179-186, 2010.
doi:10.1109/LMWC.2007.899312 Google Scholar

12. Hung, C. Y., M. H. Weng, R. Y. Yang, and Y. K. Su, "Design of the compact parallel coupled wideband bandpass filter with very high selectivity and wide stopband," IEEE Microwave and Wireless Components Letters, Vol. 17, No. 7, 510-512, July 2007.
doi:10.1109/LMWC.2016.2558039 Google Scholar

13. Lan, S.-W., M.-H. Weng, C.-Y. Hung, and S.-J. Chang, "Design of a compact ultra-wideband bandpass filter with an extremely broad stopband region," IEEE Microwave and Wireless Components Letters, Vol. 26, No. 6, 894-896, June 2016. Google Scholar

14. Zhu, L., S. Sun, and R. Li, Microwave Bandpass Filters for Wideband Communications, Wiley, 2001.
doi:10.1049/el.2011.2658

15. Feng, W. J., W. Q. Che, and T. F. Eibert, "Ultra-wideband bandpass filter based on transversal signal-interaction concepts," IET Electronics Letters, Vol. 47, No. 24, 1330-1331, 2011. Google Scholar

Professor Xiuping Li

Mr. Qi Xia

Dr. Junjie Zeng