Vol. 39

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues
2013-04-18

Compact Wide Stopband Quasi-Elliptic Function Lowpass Filter Using Quasi-Lumped Elements

By Chen Miao, Xin Xu, and Wen Wu
Progress In Electromagnetics Research Letters, Vol. 39, 151-159, 2013
doi:10.2528/PIERL13032202

Abstract

This paper presents a novel quasi-elliptic function lowpass filter (LPF) by using quasi-lumped elements. The proposed LPF is firstly based on a seven-order Chebyshev response lowpass prototype. Then, a series branches of shunt resonant LC circuit is introduced in the filter design to provide a transmission zero close to the transition band, which can improve the roll-off rate of proposed LPF significantly. To implement the lumped elements of lowpass prototype, the high-impedance meander lines are employed to realized the inductors while inter-digital microstrip lines and the microstrip parallel-plate structures are used to realize the capacitors. To validate the proposed method, a LPF with 3 dB cutoff frequency fc at 1.9 GHz is designed and fabricated. The measured results show that the fabricated LPF has a sharp roll-off rate up to -142 dB/octave and -15 dB harmonic suppression from 1.1fc to 9.7fc. Moreover, the fabricated LPF also has a compact size of 0.1λgc × 0.11λgc. Good agreement can observed between the simulation and measurement.

Citation


Chen Miao, Xin Xu, and Wen Wu, "Compact Wide Stopband Quasi-Elliptic Function Lowpass Filter Using Quasi-Lumped Elements," Progress In Electromagnetics Research Letters, Vol. 39, 151-159, 2013.
doi:10.2528/PIERL13032202
http://www.jpier.org/PIERL/pier.php?paper=13032202

References


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

    2. Li, L., Z.-F. Li, and Q.-F. Wei, "Compact and selective lowpass filter with very wide stopband using tapered compact microstrip resonant cells," Elecron. Lett., Vol. 45, No. 5, 267-268, 2009.

    3. Li, J.-L., S.-W. Qu, and Q. Xue, "Compact microstrip lowpass filter with sharp roll-off and wide stop-band," Elecron. Lett., Vol. 45, No. 2, 110-111, 2009.

    4. Li, K., M. Zhao, Y. Fan, Z. Zhu, and W. Cui, "Compact lowpass filter with wide stopband using novel double-folded SCMRC structure with parallel open-ended stub," Progress In Electromagnetics Research Letters, Vol. 36, 77-86, 2013.

    5. Ka, 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, 2011.

    6. Cao, H., W. Guan, S. He, and L. Yang, "Compact lowpass filter with high selectivity using G-shaped defected microstrip structure ," Progress In Electromagnetics Research Letters, Vol. 33, 55-62, 2012.

    7. Chen, Q. and J. Xu, "DGS resonator with two transmission zeros and its application to lowpass filter design," Elecron. Lett., Vol. 46, No. 21, 1447-1449, 2010.

    8. Al Sharkawy, M. H., D. Abd El-Aziz, and E. Galal, "A miniaturized lowpass/bandpass filter using double arrow head defected ground structure with centered etched ellipse," Progress In Electromagnetics Research Letters, Vol. 24, 99-107, 2011.

    9. Wang, C. J. and T. H. Lin, "A multi-band meandered slotted-ground-plane resonator and its application of lowpass filter," Progress In Electromagnetics Research, Vol. 120, 249-262, 2011.

    10. Hayati, M., H. A.-D. Memari, and H. Abbasi, "Compact microstrip lowpass filter with sharp roll-off and wide stopband using semicircle stub resonator," Progress In Electromagnetics Research Letters, Vol. 35, 73-81, 2012.

    11. Hayati, M. , H. Asadbeigi, and A. Sheikhi, "Microstrip lowpass filter with high and wide rejection band," Elecron. Lett., Vol. 48, No. 19, 1217-1219, 2012.

    12. Wang, J. P., H. Cui, and G. Zhang, "Design of compact microstrip lowpass filter with ultra-wide stopband," Elecron. Lett., Vol. 48, No. 14, 854-856, 2012.

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