Vol. 42
Latest Volume
All Volumes
PIERC 142 [2024] PIERC 141 [2024] PIERC 140 [2024] PIERC 139 [2024] PIERC 138 [2023] PIERC 137 [2023] PIERC 136 [2023] PIERC 135 [2023] PIERC 134 [2023] PIERC 133 [2023] PIERC 132 [2023] PIERC 131 [2023] PIERC 130 [2023] PIERC 129 [2023] PIERC 128 [2023] PIERC 127 [2022] PIERC 126 [2022] PIERC 125 [2022] PIERC 124 [2022] PIERC 123 [2022] PIERC 122 [2022] PIERC 121 [2022] PIERC 120 [2022] PIERC 119 [2022] PIERC 118 [2022] PIERC 117 [2021] PIERC 116 [2021] PIERC 115 [2021] PIERC 114 [2021] PIERC 113 [2021] PIERC 112 [2021] PIERC 111 [2021] PIERC 110 [2021] PIERC 109 [2021] PIERC 108 [2021] PIERC 107 [2021] PIERC 106 [2020] PIERC 105 [2020] PIERC 104 [2020] PIERC 103 [2020] PIERC 102 [2020] PIERC 101 [2020] PIERC 100 [2020] PIERC 99 [2020] PIERC 98 [2020] PIERC 97 [2019] PIERC 96 [2019] PIERC 95 [2019] PIERC 94 [2019] PIERC 93 [2019] PIERC 92 [2019] PIERC 91 [2019] PIERC 90 [2019] PIERC 89 [2019] PIERC 88 [2018] PIERC 87 [2018] PIERC 86 [2018] PIERC 85 [2018] PIERC 84 [2018] PIERC 83 [2018] PIERC 82 [2018] PIERC 81 [2018] PIERC 80 [2018] PIERC 79 [2017] PIERC 78 [2017] PIERC 77 [2017] PIERC 76 [2017] PIERC 75 [2017] PIERC 74 [2017] PIERC 73 [2017] PIERC 72 [2017] PIERC 71 [2017] PIERC 70 [2016] PIERC 69 [2016] PIERC 68 [2016] PIERC 67 [2016] PIERC 66 [2016] PIERC 65 [2016] PIERC 64 [2016] PIERC 63 [2016] PIERC 62 [2016] PIERC 61 [2016] PIERC 60 [2015] PIERC 59 [2015] PIERC 58 [2015] PIERC 57 [2015] PIERC 56 [2015] PIERC 55 [2014] PIERC 54 [2014] PIERC 53 [2014] PIERC 52 [2014] PIERC 51 [2014] PIERC 50 [2014] PIERC 49 [2014] PIERC 48 [2014] PIERC 47 [2014] PIERC 46 [2014] PIERC 45 [2013] PIERC 44 [2013] PIERC 43 [2013] PIERC 42 [2013] PIERC 41 [2013] PIERC 40 [2013] PIERC 39 [2013] PIERC 38 [2013] PIERC 37 [2013] PIERC 36 [2013] PIERC 35 [2013] PIERC 34 [2013] PIERC 33 [2012] PIERC 32 [2012] PIERC 31 [2012] PIERC 30 [2012] PIERC 29 [2012] PIERC 28 [2012] PIERC 27 [2012] PIERC 26 [2012] PIERC 25 [2012] PIERC 24 [2011] PIERC 23 [2011] PIERC 22 [2011] PIERC 21 [2011] PIERC 20 [2011] PIERC 19 [2011] PIERC 18 [2011] PIERC 17 [2010] PIERC 16 [2010] PIERC 15 [2010] PIERC 14 [2010] PIERC 13 [2010] PIERC 12 [2010] PIERC 11 [2009] PIERC 10 [2009] PIERC 9 [2009] PIERC 8 [2009] PIERC 7 [2009] PIERC 6 [2009] PIERC 5 [2008] PIERC 4 [2008] PIERC 3 [2008] PIERC 2 [2008] PIERC 1 [2008]
2013-07-15
Quasi-Elliptic Wideband Bandpass Filters Using Stubs Loaded Anti-Parallel Coupled-Line
By
Progress In Electromagnetics Research C, Vol. 42, 13-28, 2013
Abstract
This paper presents a new type of wideband bandpass filter (BPF) with quasi-elliptic frequency response by using proposed stubs loaded anti-parallel coupled-line. With different loads, the proposed stubs loaded anti-parallel coupled-line has different numbers of transmission zeros (TZs). These TZs are symmetrical along the designing frequency f0. By using a quarter-wavelength parallel coupled-line to connect two proposed stubs loaded anti-parallel coupled-line, three wideband BPFs centered at f0 = 1.575 GHz with quasi-elliptic frequency response are successfully designed. Good agreements between the simulations and measurements can be observed. The measured results also exhibits that the fabricated BPFs have the merits of low in-band insertion loss, good in-band return loss, sharp passband selectivity and high out-of-band rejection.
Citation
Xin Xu, and Wen Wu, "Quasi-Elliptic Wideband Bandpass Filters Using Stubs Loaded Anti-Parallel Coupled-Line," Progress In Electromagnetics Research C, Vol. 42, 13-28, 2013.
doi:10.2528/PIERC13061707
References

1. Wu, Y., Y. Liu, S. Li, and C. Yu, "A new wide-stopband lowpass filter with generalized coupled-line circuit and analytical theory," Progress In Electromagnetics Research, Vol. 116, 553-567, 2011.

2. Wu, Y. and Y. Liu, "A coupled-line bandstop filter with three-section transmission-line stubs and wide upper passband performance," Progress In Electromagnetics Research, Vol. 119, 407-421, 2011.

3. Cui, D., Y. Liu, Y. Wu, S. Li, and C. Yu, "A compact bandstop filter based on two-meandered parallel-coupled lines," Progress In Electromagnetics Research, Vol. 121, 271-279, 2011.

4. Liu, G. and Y. Wu, "Novel in-line microstrip coupled-line bandstop filter with sharp skirt selectivity," Progress In Electromagnetics Research, Vol. 137, 585-597, 2013.

5. Cheong, P., S.-W. Fok, and K.-W. Tam, "Miniaturized parallel coupled-line bandpass filter with spurious-response suppression," IEEE Trans. Microw. Theory Tech., Vol. 53, No. 5, 1810-1816, 2005.

6. Lee, S. and Y. Lee, "Generalized miniaturization method for coupled-line bandpass filters by reactive loading," IEEE Trans. Microw. Theory Tech., Vol. 58, No. 9, 2383-2391, 2010.

7. Park, J.-H., S. Lee, and Y. Lee, "Extremely miniaturized bandpass filters based on asymmetric coupled lines with equal reactance," IEEE Trans. Microw. Theory Tech., Vol. 60, No. 2, 261-269, 2012.

8. Tiwary, A. K. and N. Gupta, "Design of compact coupled microstrip line bandpass filter with improved stopband characteristics," Progress In Electromagnetics Research C, Vol. 24, 97-109, 2011.

9. Hua, C., C. Chen, C. Miao, and W. Wu, "Microstrip bandpass filters using dual-mode resonators with internal coupled lines," Progress In Electromagnetics Research C, Vol. 21, 99-111, 2011.

10. Wu, C.-H., Y.-S. Lin, C.-H. Wang, and C. H. Chen, "Compact microstrip coupled-line bandpass filter with four transmission zeros," IEEE Microw. Wireless Compon. Lett., Vol. 15, No. 9, 579-581, 2005.

11. Wong, S. W., K. Wang, Z. N. Chen, and Q. X. Chu, "Rotationally symmetric coupled-lines bandpass filter with two transmission zeros," Progress In Electromagnetics Research, Vol. 135, 641-656, 2013.

12. Wang, L. and L. Jin, "A quasi-elliptic microstrip bandpass filter using modified anti-parallel coupled-line," Progress In Electromagnetics Research, Vol. 138, 245-253, 2013.

13. Miller, A. and J.-S. Hong, "Reconfigurable cascaded coupled line filter with four distinct bandwidth states," IET Microw. Antennas Propag., Vol. 5, No. 14, 1730-1737, 2011.

14. Marimuthu, J., A. M. Abbosh, and B. Henin, "Planar microstrip bandpass filter with wide dual bands using parallel-coupled lines and stepped impedance resonators," Progress In Electromagnetics Research C, Vol. 35, 49-61, 2013.

15. Kuo, J. T., C.-Y. Fan, and S.-C. Tang, "Dual-wideband bandpass filters with extended stopband based on coupled-line and coupled three-line resonators," Progress In Electromagnetics Research, Vol. 124, 1-15, 2012.

16. Lee, S. and Y. Lee, "A planar dual-band filter based on reduced-ength parallel coupled lines," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 1, 16-18, 2010.

17. Lee, S. and Y. Lee, "A uniform coupled-line dual-band filter with different bandwidths," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 10, 545-547, 2010.

18. George, I. Z. and A. K. Johnson, "Coupled transmission line networks in an inhomogeneous dielectric medium," IEEE Trans. Microw. Theory Tech., Vol. 17, No. 10, 753-759, 1969.

19. Hong, J. S. and M. J. Lancaster, Microstrip Filter for RF/Microwave Applications, Wiley, New York, 2001.