volume | PIER Journals

Abstract

An asymmetrical cross-shaped microstrip resonator is proposed. It is analyzed on its characteristic impedance and resonant conditions. A first order triband bandstop filter (BSF) and a second order triband BSF are designed using this resonator. Both filters are simulated on Sonnet Suite software. Simulation results show that both filters generate three stopbands at 2.0, 3.0, and 4.5 GHz. The second order BSF is also fabricated and measured using a microwave network analyzer. Simulation and measurement results on the second order BSF agree well.

1. Hong, J. S., Microstrip Filters for RF/Microwave Applications, John Wiley and Sons Inc., 2001.
doi:10.1002/0471221619

2. Singh, K., K. Ngachenchaiah, D. Bhatnagar, and S. Pal, "Wideband, compact microstrip bandstop filter for triband operations," Proceedings of International Conference on Microwave, 96-98, 2008. Google Scholar

3. Xiao, J. K. and W. J. Zhu, "New defected Microstrip structure bandstop filter," Progress In Electromagnetics Research Symposium, Suzhou, China, September 12-16, 2011. Google Scholar

4. Xiao, J. K. and H. F. Huang, "Square patch resonator bandstop filter," IEEE International Conference on Communication Technology, 104-107, 2010. Google Scholar

5. Wang, Z., F. Nasri, and C. W. Park, "Compact tri-band notched UWB bandpass filter based on interdigital hairpin finger structure," WAMICON 2011 Proceedings, 1-4, 2011. Google Scholar

6. Jankovic, N., R. Geschke, and V. Crnojevic-Benjin, "Compact tri-band bandpass and bandstop filters based on Hilbert-Fork resonators," Microwave and Wireless Components Letters, Vol. 23, No. 6, 282-284, 2013.
doi:10.1109/LMWC.2013.2258005 Google Scholar

7. Liu, L., R. Jin, X. Bai, Y. Li, X. Liang, J. Geng, and C. He, "A tri-band bandstop filter with sharp rejection and controllable bandstop frequencies," Proceedings of IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2543-2544, 2015.
doi:10.1109/APS.2015.7305660 Google Scholar

8. Ahmed, H. A., J. K. Ali, A. J. Salim, and N. Hussain, "A compact triple band BSF design based on Minkowski fractal Geometry," 18th Mediterranean Electro-technical Conference (MELECON), 1-5, 2016. Google Scholar

9. Ning, H., J. Wang, Q. Xiong, and L. Mao, "Design of planar and dual and triple narrowband bandstop filters with independently controlled stopbands and improved spurious response," Progress In Electromagnetics Research, Vol. 131, 259-274, 2012.
doi:10.2528/PIER12072109 Google Scholar

10. Boutejdar, A. and S. D. Bennani, "Design and fabrication of tri-stopband bandstop filters using cascaded and multi-armed method," Advanced Electromagnetics, Vol. 6, No. 3, 2017. Google Scholar

11. Adhikari, K. K. and N. Y. Kim, "Microstrip triband bandstop filter with sharp stop band skirts and independently controllable second stop band response," The Scientific World Journal, Vol. 2014, Article ID 760838, 9 pages, http://dx.doi.org/10.1155/2014/760838, 2014. Google Scholar

12. Pozar, D. M., Microwave Engineering, 2nd Ed., 65-68, John Wiley & Sons Inc., 1998.

Dr. Shujun Yang

Dr. Zhigang Xiao

Dr. Satilmis Budak