A New Microstrip Diplexer Using Coupled Stepped Impedance Resonators
This paper presents a new structure of microstrip band
pass filter (BPF) based on coupled stepped impedance resonators.
Each filter consists of two coupled stepped impedance resonators
connected to microstrip feed lines. The coupled junction is utilized to
connect the two BPFs to the antenna. This two band pass filters are
designed and simulated to operate for the digital communication
system (DCS) and Industrial Scientific and Medical (ISM) bands at
1.8 GHz and 2.45 GHz respectively. The proposed circuit presents
good performances with an insertion loss lower than 2.3 dB and
isolation between the two channels greater than 21 dB. The prototype
of the optimized diplexer have been investigated numerically by
using ADS Agilent and verified with CST microwave software.
[1] D. M. Pozar, Microwave Engineering, John Wiley & Sons 1998.
[2] E. Goron, J.P. Coupez, C. Person, Y. Toutain, H. Lattard, and F. Perrot,
Accessing to UMTS filtering specifications using new microstrip
miniaturized loop-filters, IEEE MTT-S Int Microwave Symp Dig
Philadelphia, PA (2003), 1599–1602.
[3] Strassner, B. and K. Chang, “Wide-band low-loss high isolation
microstrip periodic-stub diplexer for multiple-frequency applications”,
IEEE Trans. Microw. Theory Tech., Vol. 49, 1818-1820, 2001.
[4] Ye, C. S., Y. K. Su, M. H. Weng, and C. Y. Hung, “A microstrip ringlike
diplexer for bluetooth and ultra wide band (UWB) application, ”
Microwave & Opt. Tech. Lett., Vol. 51, 1518-1520, 2009.
[5] Weng, M. H., C. Y. Hung, and Y. K. Su, “A hairpin line diplexer for
direct sequence ultra-wideband wireless communications,” IEEE
Microw. Wireless Compon. Lett., Vol. 17, 519-521, 2007.
[6] Chen, C. F., T. Y. Huang, C. P. Chou, and R. B. Wu, “Microstrip
diplexers design with common resonator sections for compact size, but high isolation,” IEEE Trans. Microw. Theory Tech., Vol. 54, 1945-1952,
2006.
[7] F. Sheta, J. P. Coupez, G. Tanné, S. Toutain, and J. P. Bolt, “Miniature
microstrip stepped impedance resonator band pass filters and diplexers
for mobile communications,” 1996 IEEE MTT-S Digest, WE2C-2, pp.
607-610.
[8] W. W. Choi, and K. W. Tam, “A microstrip SIR dual-mode bandpass
filter with simultaneous size reduction and spurious responses
suppression, ” IEEE MTT-S International Microwave Workshop Series
on Art of Miniaturizing RF and Microwave Passive Components,
Chengdu, China, 2008.
[9] Tang, C. W. and H. H. Liang, “Parallel-coupled stacked SIRs bandpass
filters with open-loop resonators for suppression of spurious responses,”
IEEE Microw. Wireless Compon. Lett., Vol. 15, 802-804, 2005.
[10] Makimoto, M. and S. Yamashita, “Bandpass filters using parallelcoupled
stripline stepped-impedance resonators,” IEEE Trans. Microw.
Theory Tech., Vol. 28, 1413-1417, 1980.
[11] C. Quendo, E. Rius, C. Person, “ Narrow bandpass filters using dual
behavior resonators (DBRs) based on stepped impedance stubs and
differents-length stubs,” IEEE Trans. Microwave Theory & Tech, vol.
52, n°3, March 2004.
[12] Sugchai, Tantiviwat “A Design of Wide-Stopband Microstrip Diplexers
with Multiorder Spurious-Mode Suppression Using Stepped-Impedance
Resonators,” presented in IEEE Engineering and Technology (S-CET),
2012 Spring Congress, 27-30 May 2012.
[13] Puttadilok, Duangporn, “A microstrip diplexer filter using steppedimpedance
resonators,” presented in IEEE SICE Annual Conference,
20-22 Aug 2008.
[14] S.-C. Lin, P.-H. Deng, Y.-S. Lin, C.-H. Wang and C. H. Chen, “Widestopband
microstrip bandpass filters using dissimilar quarter-wavelength
stepped-impedance resonators”, IEEE Trans. Microwave Theory Tech.,
Vol. 54, pp. 1011-1018, Mar. 2006.
[15] C.-W. Tang and H.-H. Liang, “Parallel-coupled stacked SIRs bandpass
filters with open-loop resonators for suppression of spurious responses”,
IEEE Microwave Wireless Comp. Lett., Vol. 15, pp. 802-804, Nov.
2005.
[16] H. Wang and L. Zhu, “Microstrip bandpass filters with ultra-broad
rejection band using stepped impedance resonator and high-impedance
transformer”, in IEEE MTT-S Int. Microwave Symp. Dig., pp. 683-686,
Long Beach, USA, June 2005.
[1] D. M. Pozar, Microwave Engineering, John Wiley & Sons 1998.
[2] E. Goron, J.P. Coupez, C. Person, Y. Toutain, H. Lattard, and F. Perrot,
Accessing to UMTS filtering specifications using new microstrip
miniaturized loop-filters, IEEE MTT-S Int Microwave Symp Dig
Philadelphia, PA (2003), 1599–1602.
[3] Strassner, B. and K. Chang, “Wide-band low-loss high isolation
microstrip periodic-stub diplexer for multiple-frequency applications”,
IEEE Trans. Microw. Theory Tech., Vol. 49, 1818-1820, 2001.
[4] Ye, C. S., Y. K. Su, M. H. Weng, and C. Y. Hung, “A microstrip ringlike
diplexer for bluetooth and ultra wide band (UWB) application, ”
Microwave & Opt. Tech. Lett., Vol. 51, 1518-1520, 2009.
[5] Weng, M. H., C. Y. Hung, and Y. K. Su, “A hairpin line diplexer for
direct sequence ultra-wideband wireless communications,” IEEE
Microw. Wireless Compon. Lett., Vol. 17, 519-521, 2007.
[6] Chen, C. F., T. Y. Huang, C. P. Chou, and R. B. Wu, “Microstrip
diplexers design with common resonator sections for compact size, but high isolation,” IEEE Trans. Microw. Theory Tech., Vol. 54, 1945-1952,
2006.
[7] F. Sheta, J. P. Coupez, G. Tanné, S. Toutain, and J. P. Bolt, “Miniature
microstrip stepped impedance resonator band pass filters and diplexers
for mobile communications,” 1996 IEEE MTT-S Digest, WE2C-2, pp.
607-610.
[8] W. W. Choi, and K. W. Tam, “A microstrip SIR dual-mode bandpass
filter with simultaneous size reduction and spurious responses
suppression, ” IEEE MTT-S International Microwave Workshop Series
on Art of Miniaturizing RF and Microwave Passive Components,
Chengdu, China, 2008.
[9] Tang, C. W. and H. H. Liang, “Parallel-coupled stacked SIRs bandpass
filters with open-loop resonators for suppression of spurious responses,”
IEEE Microw. Wireless Compon. Lett., Vol. 15, 802-804, 2005.
[10] Makimoto, M. and S. Yamashita, “Bandpass filters using parallelcoupled
stripline stepped-impedance resonators,” IEEE Trans. Microw.
Theory Tech., Vol. 28, 1413-1417, 1980.
[11] C. Quendo, E. Rius, C. Person, “ Narrow bandpass filters using dual
behavior resonators (DBRs) based on stepped impedance stubs and
differents-length stubs,” IEEE Trans. Microwave Theory & Tech, vol.
52, n°3, March 2004.
[12] Sugchai, Tantiviwat “A Design of Wide-Stopband Microstrip Diplexers
with Multiorder Spurious-Mode Suppression Using Stepped-Impedance
Resonators,” presented in IEEE Engineering and Technology (S-CET),
2012 Spring Congress, 27-30 May 2012.
[13] Puttadilok, Duangporn, “A microstrip diplexer filter using steppedimpedance
resonators,” presented in IEEE SICE Annual Conference,
20-22 Aug 2008.
[14] S.-C. Lin, P.-H. Deng, Y.-S. Lin, C.-H. Wang and C. H. Chen, “Widestopband
microstrip bandpass filters using dissimilar quarter-wavelength
stepped-impedance resonators”, IEEE Trans. Microwave Theory Tech.,
Vol. 54, pp. 1011-1018, Mar. 2006.
[15] C.-W. Tang and H.-H. Liang, “Parallel-coupled stacked SIRs bandpass
filters with open-loop resonators for suppression of spurious responses”,
IEEE Microwave Wireless Comp. Lett., Vol. 15, pp. 802-804, Nov.
2005.
[16] H. Wang and L. Zhu, “Microstrip bandpass filters with ultra-broad
rejection band using stepped impedance resonator and high-impedance
transformer”, in IEEE MTT-S Int. Microwave Symp. Dig., pp. 683-686,
Long Beach, USA, June 2005.
@article{"International Journal of Electrical, Electronic and Communication Sciences:68834", author = "A. Chinig and J. Zbitou and A. Errkik and L. Elabdellaoui and A. Tajmouati and A. Tribak and M. Latrach", title = "A New Microstrip Diplexer Using Coupled Stepped Impedance Resonators", abstract = "This paper presents a new structure of microstrip band
pass filter (BPF) based on coupled stepped impedance resonators.
Each filter consists of two coupled stepped impedance resonators
connected to microstrip feed lines. The coupled junction is utilized to
connect the two BPFs to the antenna. This two band pass filters are
designed and simulated to operate for the digital communication
system (DCS) and Industrial Scientific and Medical (ISM) bands at
1.8 GHz and 2.45 GHz respectively. The proposed circuit presents
good performances with an insertion loss lower than 2.3 dB and
isolation between the two channels greater than 21 dB. The prototype
of the optimized diplexer have been investigated numerically by
using ADS Agilent and verified with CST microwave software.
", keywords = "Band Pass Filter, coupled junction, coupled stepped
impedance resonators, diplexer, insertion loss, isolation.", volume = "9", number = "1", pages = "41-4", }
