1. Divyabramham, K., M.-K. Mandal, and S. Sanyal, "Sharp-rejection wideband bandstop filters," IEEE Microw. Wireless Compon. Lett., Vol. 18, No. 10, 2008.
doi:10.1109/LMWC.2008.2003452        Google Scholar

2. Velidi, V.-K., A.-B. Guntupalli, and S. Sanyal, "Sharp-rejection ultra-wide bandstop filters," IEEE Microw. Wireless Compon. Lett., Vol. 19, Aug. 2009.        Google Scholar

3. Sanchez-Soriano, M. A., G. Torregrosa-Penalva, and E. Bronchalo, "Compact wideband bandstop filter with four transmission zeros," IEEE Microw. Wireless Compon. Lett., Vol. 20, No. 6, Jun. 2010.
doi:10.1109/LMWC.2010.2047468        Google Scholar

4. Xia, J.-K. and W.-J. Zhu, "New defected microstrip structure bandstop filter," PIERS Proceedings, 1471-1474, Suzhou, China, Sep. 12-16, 2011.        Google Scholar

5. Cheng, D., H.-C. Yin, and H.-X. Zheng, "A compact dual-band bandstop filter with defected microstrip slot," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 10, 1374-1380, Jul. 2012.
doi:10.1080/09205071.2012.700262        Google Scholar

6. Xiang, Q.-Y., Q.-Y. Feng, and X.-G. Huang, "A novel microstrip bandstop filter and its application to reconfigurable filter," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 8-9, 1039-1047, 2012.
doi:10.1080/09205071.2012.710365        Google Scholar

7. Won, Y.-S., K. U. Bae, and N. H. Myung, "Design method for bandpass filter with enhanced stopband rejection using spiral SIRs," Electronics Letters, Vol. 48, No. 17, 1067-1068, The Institution of Engineering and Technology, May 11, 2012.
doi:10.1049/el.2011.0676        Google Scholar

8. Lim, H., J.-H. Lee, S.-H. Lim, D.-H. Shin, and N.-H. Myung, "A novel compact microstrip bandstop filter based on spiral resonators," Proceedings of Asia-Pacific Microwave Conference, 2007.        Google Scholar

9. Lin, S.-C., C.-H. Wang, and C.-H. Chen, "Novel patch-via-spiral resonators for the development of miniaturized bandpass filters with transmission zeros ," IEEE Trans. on Microw. Theory and Tech., Vol. 55, No. 1, Jan. 2007.        Google Scholar

10. Wei, X.-B., Y.-Shi, P.-Wang, J. X. Liao, Z. Q. Xu, and B. C. Yang, "Design of compact, wide stopband bandpass filter using stepped impedance resonator," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 8-9, 1095-1104, 2012.
doi:10.1080/09205071.2012.710534        Google Scholar

11. 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.
doi:10.1163/156939310790322163        Google Scholar

12. Jiang, H., B. Lacroix, and J. Papapolymerou, "Compact tunable UHF bandstop resonator filter using varactor-loaded CPW bottom-side meander line," Proceedings of the 6th European Microwave Integrated Circuits Conference, 502-505, 2011.        Google Scholar

13. Kim, , J.-Y. and H.-Y. Lee, "Wideband and compact bandstop filter structure using double-plane superposition," IEEE Microw. Wireless Compon. Lett., Vol. 13, No. 7, Jul. 2003.        Google Scholar

14. Yang, J.-P. and W. Wu, "Compact bandstop filter with enhanced stopband performances using defected ground structure," Proceedings of Asia-Pacific Microwave Conference, 2007.        Google Scholar

15. Rehman, S.-U., A.-F. Sheta, and M. Alkanhal, "Compact band-stop filter using defected ground structure (DGS)," Saudi International Electronics, Communications and Photonics Conference (SIECPC), 2011.        Google Scholar

16. Hong, J. S. and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications, Wiley, 2001.
doi:10.1002/0471221619