A Simple Method of Designing Dualband and MultiBandpass Filters
Keywords:
Dual-bandpass filter, maximally-flat filter, equal-ripple filter, bandpass filter, Bandstop filter, frequency transformationAbstract
The theme of this paper is to present a simple technique to design dual-bandpass filters. This technique is based on the frequency transformations of prototype lowpass filter to the desired bandpass and band reject filters and arranging them in series and shunt configurations in a special way to meet the desired specifications. Different possible combinations are considered and presented the best possible configuration to validate this new design. Emphasis is given to dual bandpass filter while this can be extended to multi-bandpass filters as well. The design of dual bandpass with different orders is presented in this paper for maximally flat and equal ripple filters.
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References
Goes T. P., R. N. de Lima, L. Martinez, and F. R. de Sousa, A design technique for distributed dual-band bandpass filters, in Circuits and Systems (LASCAS), IEEE Fourth Latin American Symposium, pp. 1–4, 2013.
J. Lee and K. Sarabandi, A synthesis method for dualpassband microwave filters, IEEE Transactions on Microwave Theory and Techniques, vol. 55, no. 6, pp. 1163–1170, 007.
S. Lee and Y. Lee, A planar dual-band filter based on reducedlength parallel coupled lines, IEEE Microwave and Wireless Components Letters, vol. 20, no. 1, pp. 16–18, 2010.
S.-C. Lin and C.-Y. Yeh, Design of microstrip triplexer with high isolation based on parallel coupled-line filters using tshaped short-circuited resonators, IEEE Microwave and
Wireless Components Letters, vol. 25, no. 10, pp. 648–650, 2015.
Sun, Y.-C. C.-W. Tang, J.-W. Wu, and Y.-C. Lin, Design of a wide stopband bandpass filter with the two-path coupled lines, in 2014 IEEE MTT-S International Microwave Symposium (IMS2014), pp. 1–3, 2014.
Wang, B.-H. C.-W. Tang, High-selectivity dual-passband bandpass filter with dual coupled lines, IEEE MTT-S International Microwave Symposium (IMS2014)., pp. 1–3, 2014.
S. Zhang and L. Zhu, Compact tri-band bandpass filter based on resonators with u-folded coupled-line, IEEE Microwave and Wireless Components Letters, vol. 23, no. 5, pp. 258–260, 2013.
M. A. El-Tanani and G. M. Rebeiz, Corrugated microstrip coupled lines for constant absolute bandwidth tunable filters, IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 4, pp. 956–963, 2010.
H.-M. Lee and C.-M. Tsai, Dual-band filter design with flexible passband frequency and bandwidth selections, IEEE Transactions on Microwave Theory and Techniques, vol. 55, no. 5, pp. 1002–1009, 2007.
D. M. Pozar, Microwave Engineering. John Wiley & Sons, 2009.
J.-S. G. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Applications. John Wiley & Sons, 2004, vol. 167.
