Synthesis of Multiband Filters by Linear Optimization

In this article, a new synthesis method for the generation of multiband generalized Chebyshev polynomials with prescribed transmission zeros is presented. The proposed linear optimization technique is applicable to symmetric and asymmetric filter responses. To demonstrate its general application, the technique has been applied to the direct synthesis of dual-and triple-bandpass filters. A 7th degree dual-band prototype and a 10th degree triple-band prototype, synthesized using the proposed technique, have been fabricated and tested to validate the practicality of the method.

[1]  T. Anada,et al.  Synthesis of dual-band bandpass filters using successive frequency transformations and circuit conversions , 2006, IEEE Microwave and Wireless Components Letters.

[2]  K. Sarabandi,et al.  Design of Triple-Passband Microwave Filters Using Frequency Transformations , 2008, IEEE Transactions on Microwave Theory and Techniques.

[3]  Fei Xiao.  Direct Synthesis Technique for Dual-Passband Filters: Superposition Approach , 2013, IEEE Transactions on Circuits and Systems II: Express Briefs.

[4]  K. Sarabandi,et al.  A Synthesis Method for Dual-Passband Microwave Filters , 2007, IEEE Transactions on Microwave Theory and Techniques.

[5]  F. Seyfert,et al.  Optimal Synthesis for Multi-Band Microwave Filters , 2007, 2007 IEEE/MTT-S International Microwave Symposium.

[6]  Ian Hunter,et al.  Synthesis of general Chebyshev characteristic function for dual (single) bandpass filters , 2015, 2015 IEEE MTT-S International Microwave Symposium.

[7]  C. Hsue,et al.  Dual-band bandpass filters using equal-length coupled-serial-shunted lines and Z-transform technique , 2004 .

[8]  Jiasheng Hong.  Couplings of asynchronously tuned coupled microwave resonators , 2000 .

[9]  P. Lenoir,et al.  Chebyshev Synthesis for Multi-Band Microwave Filters , 2006, 2006 IEEE MTT-S International Microwave Symposium Digest.

[10]  Raafat R. Mansour,et al.  Microwave Filters for Communication Systems: Fundamentals, Design and Applications , 2007 .

[11]  G. Macchiarella,et al.  Design techniques for dual-passband filters , 2005, IEEE Transactions on Microwave Theory and Techniques.

[12]  J. Bornemann,et al.  Coupling-Matrix Design of Dual and Triple Passband Filters , 2006, IEEE Transactions on Microwave Theory and Techniques.

[13]  F. Seyfert,et al.  Certified Computation of Optimal Multiband Filtering Functions , 2008, IEEE Transactions on Microwave Theory and Techniques.