In this paper, a novel ultra-wideband (UWB) bandpass filter (BPF) based on multiple-mode resonator (MMR) is presented. The structure of the proposed MMR constructed by a modified triple-mode stepped-impedance resonator (SIR) loaded with a T-shape stub. This stub loaded resonator can generate two more resonate modes and two transmission zeros (TZs) simultaneously. Five resonate modes of the proposed MMR are roughly allocated in the UWB pass band, as well as two TZs at the lower and upper cut-off frequencies of the passband, leading to sharp roll-off. Using aperture-backed interdigital-coupled lines for feeding, passband is realized, first harmonic resonate mode (sixth mode) suppressed by first TZ of the interdigital-coupled lines, and upper stopband extended. Resonant modes and TZs are discussed together. Finally, the proposed filter is fabricated and measured, and predicted results verified in measurement.
2. 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, Nov. 2005.
doi:10.1109/LMWC.2006.887251
3. Li, 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, Jan. 2007.
doi:10.1109/LMWC.2009.2013735
4. 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, Mar. 2009.
doi:10.1002/mop.26992
5. Honarvar, M. A. and R. A. Sadeghzadeh, "Design of coplanar waveguide ultrawideband bandpass filter using stub-loaded resonator with notched band," Microwave Opt. Technol. Lett., Vol. 54, No. 9, 2056-2061, Sep. 2012.
doi:10.2528/PIERL10030912
6. Deng, H.-W., Y.-J. Zhao, X.-S. Zhang, L. Zhang, and S.-P. Gao, "Compact quintuple-mode UWB bandpass filter with good out-of-band rejection," Progress In Electromagnetics Research Letters, Vol. 14, 111-117, 2010.
doi:10.2528/PIERL10040303
7. Deng, H.-W., Y.-J. Zhao, L. Zhang, X.-S. Zhang, and W. Zhao, "Novel UWB BPF using quintuple-mode stub-loaded resonator," Progress In Electromagnetics Research Letters, Vol. 14, 181-187, 2010.
doi:10.1109/LMWC.2011.2170672
8. Wu, X. H., Q. X. Chu, X. K. Tian, and X. Ouyang, "Quintuple-mode UWB bandpass filter with sharp roll-off and super-wide upper stopband," IEEE Microw. Wireless Compon. Lett., Vol. 21, No. 12, 661-663, Dec. 2011.
doi:10.1109/LMWC.2013.2239633
9. Shang, Z., X. Guo, B. Cao, B. Wei, X. Zhang, Y. Heng, G. Suo, and X. Song, "Design of a superconducting ultra-wideband (UWB) bandpass filter with sharp rejection skirts and miniaturized size," IEEE Microw. Wireless Compon. Lett., Vol. 23, No. 2, 72-74, Feb. 2013.
doi:10.1109/LMWC.2012.2218229
10. Zhang, Z. and F. Xiao, "An UWB bandpass filter based on a novel type of multi-mode resonator," IEEE Microw. Wireless Compon. Lett., Vol. 22, No. 10, 506-508, Oct. 2012.
doi:10.2528/PIER09020403
11. Razalli, M. S., A. Ismail, and M. A. Mahdi, "Novel compact via-less ultra-wide band filter utilizing capacitive microstrip patch," Progress In Electromagnetics Research, Vol. 91, 213-227, 2009.
doi:10.2528/PIER10070403
12. 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.
13. Tian, X.-K. and Q.-X. Chu, "A compact UWB bandpass filter with improved out-of-band performance using modified coupling structure," Progress In Electromagnetics Research Letters, Vol. 22, 191-197, 2011.
doi:10.1109/LMWC.2010.2068570
14. Nosrati, M. and M. Mirzaee, "Compact wideband microstrip bandpass filter using quasi-spiral loaded multiple-mode resonator," EEE Microw. Wireless Compon. Lett., Vol. 20, No. 11, 607-609, Nov. 2010.
doi:10.1049/iet-map.2011.0519
15. Nosrati, M. and M. Daneshmand, "Compact microstrip ultra-wideband double/single notch-band band-pass filter based on wave's cancellation theory," IET Microw. Antennas Propag., Vol. 6, No. 8, 862-868, Jun. 2012.
doi:10.1109/TMTT.2012.2227785
16. Feng, W. J., W. Q. Che, Y. M. Chang, S. Y. Shi, and Q. Xue, "High selectivity fifth-order wideband bandpass filters with multiple transmission zeros based on transversal signal-interaction concepts," IEEE Trans. on Microw. and Theory and Tech., Vol. 61, No. 1, 89-97, Jan. 2013.
Submit
