Vol. 74

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues
2017-05-15

Compact Microstrip Lowpass Filter with an Ultra-Wide Stopband and Sharp Transition Band Using T-Shaped and Polygon Resonators

By Arash Abdipour and Ashkan Abdipour
Progress In Electromagnetics Research C, Vol. 74, 51-61, 2017
doi:10.2528/PIERC16121904

Abstract

In this paper, a lowpass filter with -3 dB cutoff frequency of 5.3 GHz using T-shaped and polygon resonators is presented. The applied resonators create a sharp transition band of 0.2 GHz from -3 dB to -40 dB. To obtain an ultra-wide stopband about 54 GHz (10.18fc) with a suppressing level of -21 dB, two different suppressing cells are employed. The overall circuit size is 59.16 mm2, which indicates a small occupied area. To clarify the performance of each resonator and describe the location of the transition zeros, exact equations based on the equivalent LC circuits have been calculated.

Citation


Arash Abdipour and Ashkan Abdipour, "Compact Microstrip Lowpass Filter with an Ultra-Wide Stopband and Sharp Transition Band Using T-Shaped and Polygon Resonators," Progress In Electromagnetics Research C, Vol. 74, 51-61, 2017.
doi:10.2528/PIERC16121904
http://jpier.org/PIERC/pier.php?paper=16121904

References


    1. Wei, X. B., P. Wang, M. Q. Liu, and Y. Shi, "Compact wide-stopband lowpass filter using stepped impedance hairpin resonator with radial stubs," IEE Electron. Lett., Vol. 47, No. 15, 862-863, Jul. 2011.
    doi:10.1049/el.2011.1414

    2. Wei, F., L. Chen, X.-W. Shi, Q.-L. Huang, and X.-H. Wang, "Compact lowpass filter with wide stop-band using coupled-line hairpin unit," Electron. Lett., Vol. 46, No. 1, 88-90, 2010.
    doi:10.1049/el.2010.2411

    3. Ma, K. and K. S. Yeo, "New ultra-wide stopband low-pass filter using transformed radial stubs," IEEE Trans. Microw. Theory. Tech., Vol. 59, No. 3, 604-611, Mar. 2011.
    doi:10.1109/TMTT.2010.2095031

    4. Cui, H., J. Wang, and G. Zhang, "Design of microstrip lowpass filter with compact size and ultra-wide stopband," IEE Electron. Lett., Vol. 48, No. 14, 856-857, Jul. 2012.
    doi:10.1049/el.2012.1097

    5. Wang, J., H. Cui, and G. Zhang, "Design of compact microstrip lowpass filter with ultra-wide stopband," IEE Electron. Lett., Vol. 48, No. 14, 854-856, Jul. 2012.
    doi:10.1049/el.2012.1362

    6. Wang, J., L.-J. Xu, S. Zhao, Y.-X. Guo, and W. Wu, "Compact quasi-elliptic microstrip lowpass filter with wide stopband," IEE Electron. Lett., Vol. 46, No. 20, 1384-1385, 2010.
    doi:10.1049/el.2010.1569

    7. Luo, S., L. Zhu, and S. Sun, "Stopband-expanded low-pass filters using microstrip coupled-line hairpin units," IEEE Microw. Wireless Compon. Lett., Vol. 18, No. 8, 506-508, Aug. 2008.
    doi:10.1109/LMWC.2008.2001004

    8. Velidi, V. K. and S. Sanyal, "Sharp roll-off lowpass filter with wide stopband using stub-loaded coupled-line hairpin unit," IEEE Microw. Wireless Compon. Lett., Vol. 21, No. 6, 301-303, Jun. 2011.
    doi:10.1109/LMWC.2011.2132120

    9. Mandal, M. K., P. Mondal, S. Sanyal, and A. Chakrabarty, "Low insertion-loss, sharp rejection and compact microstrip lowpass filter," IEEE Microw. Wirel. Compon. Lett., Vol. 16, No. 11, 600-602, 2006.
    doi:10.1109/LMWC.2006.884777

    10. Gomez-Garcia, R., M. A. Sanchez-Soriano, M. Sanchez Renedo, G. Torregrosa-Penalva, and E. Bronchalo, "Extended-stopband microstrip lowpass filter using rat-race directional couplers," Electron. Lett., Vol. 49, No. 4, 272-274, 2013.
    doi:10.1049/el.2012.4245

    11. Abdipour, A., A. Abdipour, and S. Lotfi, "A lowpass filter with sharp roll-off and high relative stopband bandwidth using asymmetric high-low impedance patches," Radioengineering, Vol. 24, No. 3, 712-716, 2015.
    doi:10.13164/re.2015.0712

    12. Hong, J.-S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, John Wiley & Sons, Inc., 2001.
    doi:10.1002/0471221619

    13. Boutejdar, A., "Design of a very compact U-HI-LO low-pass filter using meander technique and quasi horn inductors for L-band and C-band applications," Microwave and Optical Technology Letters, Vol. 58, No. 12, 2897-2901, 2016.
    doi:10.1002/mop.30173

    14. Boutejdar, A., et al., "A simple transformation from lowpass to bandpass filter using a new quasi-arrow head defected ground structure resonator and gap-J-inverter," Microwave and Optical Technology Letters, Vol. 58, No. 4, 947-953, 2016.
    doi:10.1002/mop.29705

    15. Boutejdar, A., et al., "DGS resonators form compact filters," Microwaves and RF, Vol. 54, No. 3, 52-60, 2015.

    16. Boutejdar, A., "Design of broad-stop band low pass filter using a novel quasi-Yagi-DGS-resonators and metal box-technique," Microwave and Optical Technology Letters, Vol. 56, No. 3, 523-528, 2015.
    doi:10.1002/mop.28190