Vol. 135

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues
2013-01-04

Rotationally Symmetric Coupled-Lines Bandpass Filter with Two Transmission Zeros

By Sai Wai Wong, Kai Wang, Zhi-Ning Chen, and Qing-Xin Chu
Progress In Electromagnetics Research, Vol. 135, 641-656, 2013
doi:10.2528/PIER12112405

Abstract

A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. as design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. the measured results show that the filter without any interdigital coupled-lines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-of-band rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.

Citation


Sai Wai Wong, Kai Wang, Zhi-Ning Chen, and Qing-Xin Chu, "Rotationally Symmetric Coupled-Lines Bandpass Filter with Two Transmission Zeros," Progress In Electromagnetics Research, Vol. 135, 641-656, 2013.
doi:10.2528/PIER12112405
http://jpier.org/PIER/pier.php?paper=12112405

References


    1. Zhu, L. , W. Menzel, and , "Compact microstrip bandpass filter with two transmission zeros using a stub-trapped half-wavelength line two transmission zeros using a stub-trapped half-wavelength line," IEEE Microwave Wireless Compon. Lett., Vol. 13, No. 1, 16-18, 2003..
    doi:10.1109/LMWC.2002.807705

    2. Gan, , H., , D. Lou, and D. Yang, , "Compact microstrip bandpass filter with sharp transition bands," IEEE Microwave Wireless Compon. Lett., Vol. 16, No. 3, 107-109, 2006.
    doi:10.1109/LMWC.2006.869869

    3. Choi, , S.-U., , M.-S. Chung, and S.-W. Yun, , "Hairpin tunable bandpass filter with improved selectivity and tunability," Asia-Pacific Conf. Proceedings,, Vol. 10, 1-4, 2007.

    4. Hsieh, L.-H. , K. Chang, and , "Tunable microstrip bandpass filters with two transmission zeros," IEEE Trans. Microwave Theory Tech., Vol. 51, No. 2, 520-525, 2003.
    doi:10.1109/TMTT.2002.807830

    5. Yang, , M. H., , J. Xu, Q. Zhao, L. Peng, and G. P. Li, , "Compact broad-stopband lowpass filter using SIRs-loaded circular hairpin resonators," Progress In Electromagnetics Research, Vol. 102, 95-106, 2010.
    doi:10.2528/PIER09120901

    6. Kuo, J.-T., , C.-L. Hsu, and E. Shih, , "Compact planar quasic-elliptic function filter with inline stepped-impedance resonators," IEEE Trans. Microwave Theory Tech., Vol. 55, No. 8, 1747-1755, 2007.
    doi:10.1109/TMTT.2007.901604

    7. Djaiz, , A. , T. A. Denidni, and , "A new compact microstrip two-layer bandpass ¯lter using aperture-coupled SIR-hairpin resonators with transmission zeros," IEEE Trans. Microwave Theory Tech.,, Vol. 54, No. 5, 1929-1936, 2006.
    doi:10.1109/TMTT.2006.872797

    8. Zhang, , J., , J.-Z. Gu, B. Cui, and X. W. Sun, , "Compact and harmonic suppression open-loop resonator bandpass filter with tri-section SIR," Progress In Electromagnetics Research,, Vol. 69, 93-100, 2007.
    doi:10.2528/PIER06120702

    9. Ma, D.-C., , Z.-Y. Xiao, L.-L. Xiang, X.-H. Wu, C.-Y. Huang, and X. Kou, "Compact dual-band bandpass filter using folded SIR with two stubs for WLAN," Progress In Electromagnetics Research,, Vol. 117, 357-364, 2011.

    10. Deng, , P.-H., , Y.-S. Lin, C.-H. Wang, and C. H. Chen, , "Compact microstrip bandpass fiters with good selectivity and stopband rejection," IEEE Trans. Microwave Theory Tech., Vol. 54, No. 2, 533-539, 2006.
    doi:10.1109/TMTT.2005.862709

    11. Gomez-Garcia, , R, J. I. Alonso, and , "Design of sharp-rejection and low-loss wide-band planar filters using signal-interference techniques," IEEE Microwave Wireless Compon. Lett., Vol. 15, No. 8, 530-532, 2005..
    doi:10.1109/LMWC.2005.852797

    12. Zhu, Y.-Z., , Y.-J. Xie, and H. Feng, , "Novel microstrip bandpass filters with transmission zeros," Progress In Electromagnetics Research, Vol. 77, 29-41, , 2007.
    doi:10.2528/PIER07072301