volume | PIER Journals

Abstract

In this paper, design of a novel dual-band microstrip bandstop filter is presented. The designed filter is constructed by loading two stepped impedance hairpin resonators to a simple straight transmission line, which also connects to the input and output ports. By virtue of the proposed resonator, the ratio of the first and second resonance frequencies can be obtained as approximately 4.4. Two stopbands centered at 2.34 GHz and 7.81 GHz with the fractional bandwidths of 33.2% and 7.9% can be obtained, respectively. Rejection levels inside the stopbands are obtained as better than 20 dB. Total electrical length of the proposed filter is 0.317λ_gx0.136λ_g, where λ_g is the guided wavelength at the lowest resonance frequency. The designed filter was also fabricated and tested for experimental verifications. The measured results are in an excellent agreement with the simulated ones.

1. Ma, Z., K. Kikuchi, Y. Kobayashi, T. Anada, and G. Hagiwara, "Novel microstrip dual-band bandstop filter with controllable dual-stopband response," 2006 Asia-Pacific Microwave Conference, 1174-1177, Yokohama, 2006. Google Scholar

2. Karpuz, C., A. K. Gorur, and M. Emur, "Quad-band microstrip bandstop filter design using dual-mode open loop resonators having thin film capacitors," IEEE Microwave and Wireless Components Letters, Vol. 26, No. 11, 873-875, Nov. 2016.
doi:10.1109/LMWC.2016.2615092 Google Scholar

3. Karpuz, C., A. Gorur, E. Gunturkun, and A. K. Gorur, "Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology," 2009 Asia Pacific Microwave Conference, 925-928, Singapore, 2009. Google Scholar

4. Gao, L., S.W. Cai, X. Y. Zhang, and Q. Xue, "Dual-band bandstop filter using open and short stub-loaded resonators," 2012 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 1-3, Shenzhen, 2012. Google Scholar

5. Hsieh, L.-H. and K. Chang, "Compact lowpass filter using stepped impedance hairpin resonator," Electronics Letters, Vol. 37, No. 14, 899-900, Jul. 5, 2001.
doi:10.1049/el:20010600 Google Scholar

6. Hsieh, L.-H. and K. Chang, "Compact elliptic-function low-pass filters using microstrip stepped-impedance hairpin resonators," IEEE Transactions on Microwave Theory and Techniques, Vol. 51, No. 1, 193-199, Jan. 2003.
doi:10.1109/TMTT.2002.806901 Google Scholar

7. Sagawa, M., K. Takahashi, and M. Makimoto, "Miniaturized hairpin resonator filters and their application to receiver front-end MICs," IEEE Transactions on Microwave Theory and Techniques, Vol. 37, No. 12, 1991-1997, Dec. 1989.
doi:10.1109/22.44113 Google Scholar

8. Wang, H. and Q. Chu, "A narrow-band hairpin-comb two-pole filter with source-load coupling," IEEE Microwave and Wireless Components Letters, Vol. 20, No. 7, 372-374, Jul. 2010.
doi:10.1109/LMWC.2010.2049426 Google Scholar

9. Zhu, J. and Z. Feng, "Microstrip interdigital hairpin resonator with an optimal physical length," IEEE Microwave and Wireless Components Letters, Vol. 16, No. 12, 672-674, Dec. 2006.
doi:10.1109/LMWC.2006.885622 Google Scholar

10. Quevedo-Teruel, O., L. Inclán-Sánchez, J. Vazquez-Roy, and E. Rajo-Iglesias, "Compact reconfigurable planar EBGs based on short-circuited hairpin resonators," IEEE Microwave and Wireless Components Letters, Vol. 23, No. 9, 462-464, Sept. 2013.
doi:10.1109/LMWC.2013.2274039 Google Scholar

11. Oraizi, H. and N. Azadi-Tinat, "Optimum design of novel UWB multilayer microstrip hairpin filters with harmonic suppression and impedance matching," International Journal of Antennas and Propagation, Vol. 2012, Article ID 762790, 7 pages, 2012. Google Scholar

12. Zhu, Y. Z., X. J. Zhang, and G. Y. Fang, "General design of compact T-shaped line filter with ultra-wide stopband," PIERS Proceedings, 1555-1558, Moscow, Russia, Aug. 18-21, 2009. Google Scholar

13. Kim, C.-S., T.-H. Lee, B. Shrestha, and K.-C. Son, "Stepped impedance resonator bandstop filter based on hairpin coupling configurations," International Journal of Information Communication Technology and Digital Convergence, Vol. 1, No. 1, 20-23, 2016. Google Scholar

14. Zhang, Y. H. and X. H. Tang, "Compact bandstop filter using novel coupled-line hairpin unit," 2015 IEEE International Conference on Communication Problem-Solving (ICCP), 66-68, Guilin, 2015. Google Scholar

15. Majidifar, S., S. V. A. Makki, S. Alirezaee, and A. Ahmadi, "Dual-band bandstop filter using modified stepped-impedance hairpin resonators," 2013 5th International Conference and Computational Intelligence and Communication Networks, 61-63, Mathura, 2013. Google Scholar

16. Sonnet User’s Manual, Version 16, Sonnet Software, 2016.

Dr. Jangirkhan Dzhumamuhambetov

Dr. Bakytgul Abykanova

Prof. Adnan Gorur