volume | PIER Journals

Abstract

In this letter, a novel compact UWB bandpass filter (BPF) with sharp rejection skirt is realized using quintuple-mode stub-loaded resonator. The resonator can generate three odd-modes and two even-modes in the desired band. By simply adjusting the lengths of open stubs in shunt and shortcircuited stubs, the first five resonant modes of the resonator can be roughly allocated within the 3.1-10.6 GHz UWB band meanwhile the sixth resonant mode in the upper-stopband can be suppressed. The pair of short stubs can generate two transmission zeros near the lower and upper cut-off frequencies, leading to a sharp rejection skirt. A quintuple-mode UWB BPF is designed and fabricated and the measured results demonstrate the feasibility of the design process.

1. 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/PIER07082302 Google Scholar

2. Naghshvarian-Jahromi, M. and M. Tayarani, "Miniature planar UWB bandpass filters with circular slots in ground," Progress In Electromagnetics Research Letters, Vol. 3, 87-93, 2008.
doi:10.2528/PIERL08020902 Google Scholar

3. An, J., G.-M. Wang, W.-D. Zeng, and L.-X. Ma, "UWB filter using defected ground structure of von koch fractal shape slot," Progress In Electromagnetics Research Letters, Vol. 6, 61-66, 2009.
doi:10.2528/PIERL08121309 Google Scholar

4. Hsiao, P.-Y. and R.-M. Weng, "Compact open-loop UWB filter with notched band," Progress In Electromagnetics Research Letters, Vol. 7, 149-159, 2009.
doi:10.2528/PIERL09022501 Google Scholar

5. Liu, J.-C., C.-H. Li, B.-H. Zeng, and D.-C. Chang, "DMSLR-based bandpass filter with Hilbert-curve perturbation for multiple resonances and wideband applications," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 4, 194-196, 2009.
doi:10.1109/LMWC.2009.2015486 Google Scholar

6. Baik, U.-W., S.-M. Han, C. D. Jeong, J. C. Jeong, and Y.-S. Kim, "Compact ultra-wideband bandpass filter with EBG structure," IEEE Microw. Wireless Compon. Lett., Vol. 18, No. 11, 671-673, 2008.
doi:10.1109/LMWC.2008.2003456 Google Scholar

7. Zhu, L., S. Sun, and W. Menzel, "Ultra-wideband (UWB) bandpass filters using multiple-mode resonator," IEEE Microw. Wireless Compon. Lett., Vol. 15, No. 11, 796-798, 2005.
doi:10.1109/LMWC.2005.859011 Google Scholar

8. Lei, R. and L. Zhu, "Compact UWB bandpass filter using stub-loaded multiple-mode resonator," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 1, 40-42, 2007.
doi:10.1109/LMWC.2006.887251 Google Scholar

9. Wong, S. W. and L. Zhu, "EBG-embedded multiple-mode resonator for UWB bandpass filter with improved upper-stopband performance," IEEE Microw. Wireless Compon. Lett., Vol. 17, No. 6, 421-423, 2007.
doi:10.1109/LMWC.2007.897788 Google Scholar

10. Han, L., K. Wu, and X. P. Chen, "Compact ultra-wideband bandpass filter using stub-loaded resonator," Electronics Letter, Vol. 45, No. 10, 504-506, 2009.
doi:10.1049/el.2009.0510 Google Scholar

11. Wong, S. W. and L. Zhu, "Quadruple-mode UWB bandpass filter with improved out-of-band rejection," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 3, 152-154, 2009.
doi:10.1109/LMWC.2009.2013735 Google Scholar

12. Yao, B. Y., Y. G. Zhou, and Q. S. Cao, "Compact UWB bandpass ¯lter using ring open stub loaded multiple-mode resonator," Electronics Letters, Vol. 45, No. 11, 554-556, 2009.
doi:10.1049/el.2009.1043 Google Scholar

Dr. Hong-Wei Deng

Dr. Yong-Jiu Zhao

Dr. Lu Zhang

Dr. Xue-Shun Zhang

Dr. Wei Zhao