In this paper, we present a new synthesis method for a generalized symmetric multiple band bandpass filter. By using frequency transformations on the low pass prototype, the poles and zeros of the single/dual band filtering function are obtained. These poles and zeros are combined and re-arranged to get the multiband filtering function. The coupling matrix is obtained from this multiband filtering function. A variety of filters are synthesized in order to validate the proposed theory. A triple band and quadruple band filters have been designed, fabricated and measured. The measured results have good agreement with the simulated results.
2. Lee, J., M. S. Uhm, and I.-B. Yom, "A dual-passband filter of canonical structure for satellite applications," IEEE Microwave and Wireless Components Letters, Vol. 14, 271-273, 2004.
doi:10.1109/LMWC.2004.828026
3. Jachowski, D. R., "Folded multiple bandpass filter with various couplings ,", US Patent 5410284, 1995.
4. Wu, M. S., Y. Z. Chueh, J. C. Yeh, and S. G. Mao, "Synthesis of triple-band and quad-band bandpass filters using lumped-element coplanar waveguide resonators," Progress In Electromagnetics Research B, 433-451, 2009.
doi:10.2528/PIERB09021302
5. Mokhtaari, M., J. Bornemann, K. Rambabu, and S. Amari, "Coupling-matrix design of dual and triple passband filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 54, 3940-3946, 2006.
doi:10.1109/TMTT.2006.884687
6. Chiou, Y. C. and J. T. Kuo, "Planar multiband bandpass filter with multimode stepped-impedance resonators," Progress In Electromagnetics Research, Vol. 114, 129-144, 2011.
7. Yunchi, Z., K. A. Zaki, J. A. Ruiz-Cruz, and A. E. Atia, "Analytical synthesis of generalized multi-band microwave filters," 2007 IEEE/MTT-S International Microwave Symposium, 1273-1276, 2007.
8. Lunot, V., F. Seyfert, S. Bila, and A. Nasser, "Certified computation of optimal multiband filtering functions," IEEE Transactions on Microwave Theory and Techniques, Vol. 56, 105-112, 2008.
doi:10.1109/TMTT.2007.912234
9. Macchiarella, G. and S. Tamiazzo, "Design techniques for dual-passband filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 53, 3265-3271, 2005.
doi:10.1109/TMTT.2005.855749
10. Juseop, L. and K. Sarabandi, "A synthesis method for dual-passband microwave filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 55, 1163-1170, 2007.
doi:10.1109/TMTT.2007.897712
11. Juseop, L. and K. Sarabandi, "Design of triple-passband microwave filters using frequency transformations," IEEE Transacions on Microwave Theory and Techniques, Vol. 56, 187-193, 2008.
doi:10.1109/TMTT.2007.912206
12. Kuo, Y.-T., J.-C. Lu, C.-K. Liao, and C.-Y. Chang, "New multiband coupling matrix synthesis technique and its microstrip implementation," IEEE Transactions on Microwave Theory and Techniques, Vol. 58, 1840-1850, 2010.
doi:10.1109/TMTT.2010.2050240
13. Garcia-Lamperez, A. and M. Salazar-Palma, "Single-band to multiband frequency transformation for multiband filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 59, 3048-3058, 2011.
doi:10.1109/TMTT.2011.2170579
14. Cameron, R. J., "Advanced coupling matrix synthesis techniques for microwave filters," IEEE Transactions on Microwave Theory and Techniques , Vol. 51, 1-10, 2003.
doi:10.1109/TMTT.2002.806937
15. Bell, Jr., H. C., "Canonical asymmetric coupled-resonator filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 30, 1335-1340, 1982.
doi:10.1109/TMTT.1982.1131257
16. Juseop, L. and K. Sarabandi, "Synthesizing microwave resonator filters," IEEE Microwave Magazine, Vol. 10, 57-65, 2009.
doi:10.1109/MMM.2008.930679
17. Tamiazzo, S. and G. Macchiarella, "An analytical technique for the synthesis of cascaded N-tuplets cross-coupled resonators microwave filters using matrix rotations," IEEE Transactions on Microwave Theory and Techniques, Vol. 53, 1693-1698, 2005.
doi:10.1109/TMTT.2005.847065
18. Cameron, R. J., "General coupling matrix synthesis methods for Chebyshev filtering functions," IEEE Transactions on Microwave Theory and Techniques, Vol. 47, 433-442, 1999.
doi:10.1109/22.754877
19. Ness, J. B., "A unified approach to the design, measurement, and tuning of coupled-resonator filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 56, 343-351, 1998.
doi:10.1109/22.664135
20. Hong, J.-S. and M. J. Lancaster, "Couplings of microstrip square open-loop resonators for cross-coupled planar microwave filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 44, 2099-2109, 1996.
doi:10.1109/22.543968
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