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Progress In Electromagnetics Research
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A COMPACT BANDSTOP FILTER BASED ON TWO MEANDERED PARALLEL-COUPLED LINES

By D. Cui, Y. Liu, Y. Wu, S. Li, and C. Yu

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Abstract:
In this paper, a compact wideband high-rejection microstrip bandstop filter using two meandered parallel-coupled lines of different electrical lengths and characteristic impedances in shunt is presented. The transmission and reflection zeros of the filter can be controlled through analytical equations and rulers given. Using this signal interferences technology, this filter obtains a low insertion loss and sharp rejection. Bandwidth and rejection level of the filters of this bandstop filter can be designed by choosing different even- and odd-mode characteristic impedances values of the coupled lines. According to the transmission zeros number, two types of filters are shown in the paper. To validated this topology, a wideband bandstop filter with a 3 dB cutoff frequency bandwidth of 92% centered at 2.6 GHz with sharp rejection characteristics is built to verify the theoretical prediction. The measured frequency response of the filter agrees excellently with the predicted result.

Citation:
D. Cui, 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.
doi:10.2528/PIER11061902
http://www.jpier.org/pier/pier.php?paper=11061902

References:
1. Yu, W.-H., J.-C. Mou, X. Li, and X. Lv, "A compact filter with sharp-transition and wideband-rejection using the novel defected ground structure," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 2-3, 329-340, 2009.

2. Wang, J.-P., L. Wang, Y.-X. Guo, Y. X. Wang, and D.-G. Fang, "Miniaturized dual-mode bandpass filter with controllable harmonic response for dual-band applications," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 11-12, 1525-1533, 2009.

3. Yang, M. H., J. Xu, Q. Zhao, and X. Sun, "Wide-stopband and miniaturized lowpass filters using SIRs-loaded hairpin resonators," Journal of Electromagnetic Waves and Applications, Vol. 23, No. 17-18, 2385-2396, 2009.

4. Dai, G.-L. and M.-Y. Xia, "An investigation of quarterwavelength square-spiral resonator and its applications to miniaturized bandpass filters," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 10, 1303-1313, 2010.

5. Lin, H.-J., X.-Q. Chen, X.-W. Shi, L. Chen, and C.-L. Li, "A dual passband filter using hybrid microstrip open loop resonators and coplanar waveguide slotline resonators," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 1, 141-149, 2010.

6. Chen, H., Y.-H. Wu, Y.-M. Yang, and Y.-X. Zhang, "A novel and compact bandstop filter with folded microstrip/CPW hybrid structure," Journal of Electromagnetic Waves and Applications, Vol. 24, No. 1, 103-112, 2010.

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

8. Matthaei, G. L., L. Oung, and E. M. T. Jones, Microwave Filters, Impedance Matching Networks and Coupling Structures, McGraw Hill, New York, 1964.

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

10. Tu, W.-H. and K. Chang, "Compact microstrip bandstop filter using open stub and spurline," IEEE Microw. Wirel. Compon. Lett., Vol. 15, No. 4, 268-270, 2005.

11. Woo, D.-J., et al., "Novel U-slot and V-slot DGSs for bandstop filter with Improved Q factor," IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 6, 2840-2847, 2006.

12. Hsieh, M.-Y. S. and M.Wang, "Compact and wideband microstrip bandstop filter," IEEE Microw. Wirel. Compon. Lett., Vol. 15, No. 7, 472-474, 2005.

13. Mandal, M. K., et al., "Compact, wideband bandstop filters with sharp rejection characteristic," IEEE Microw. Wirel. Compon. Lett., Vol. 18, No. 10, 665-667, 2008.

14. Sánchez-Soriano, M. Á., et al., "Compact UWB bandpass filter based on signal interference techniques," IEEE Transactions on Microwave Theory and Techniques, Vol. 19, No. 11, 92-694, 2009.

15. Mandal, M. K., et al., "Design of ultra-wideband bandstop filter with three transmission zeros," Microw. Opt. Technol. Lett., Vol. 50, No. 11, 2955-2957, 2008.

16. Zysman, G. I. and A. Kent Johnson, "Coupled transmission line networks in an Inhomogeneous dielectric medium," IEEE Transactions on Microwave Theory and Techniques, Vol. 17, No. 10, 753-758, 1969.

17. Pozar, D. M., Microwave Engineering, 2nd Ed., Wily, New York, 1998.


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