DUAL BAND FILTER DESIGN USING REAL FREQUENCY TECHNIQUE AND FREQUENCY TRANSFORMATION

Öz

In this work, we present a frequency transformation based dual-band filter design approach using scattering
based real frequency technique. In the design process, conventional low-pass to band-pass frequency transformation is
integrated with the simplified real frequency technique to construct double pass-band filters. The approach is
particularly advantageous for designing matching filters between different termination resistances. As an alternative to
a direct low-pass to dual-band frequency transformation, the use of dual-band mapping on a normalized band-pass
prototype is investigated for efficient control of the passbands. Application of the proposed approaches for dual-band
filters is presented by comparative design examples.

Anahtar Kelimeler

• Dual-band filters,frequency transformation,real frequency technique,band-pass prototype

Kaynakça

1. V. Crnojevic´-Bengin, "Advances in Multi-Band Microstrip Filters", Cambridge University Press, Cambridge, United Kingdom, 2015.
2. A. Johannes, G. Malherbe, A. Swiatko, "Modified Chebyshev band-stop filter with transmission zeros at real frequencies", Microwave and Optical Technology Letters, vol. 53, no. 1, pp. 177–180, January 2011.
3. H. Fujimoto, K. Murakami, S. Kitazawa, "Equivalent circuits and transmission zeros of the coupled squareloop resonator", IEICE Electronics Express, vol. 4, no. 18, pp. 575-581, 2007.
4. M. Weng, S. Wu, S. Jhong, Y. Chang, and M. Lee, "A novel compact dual-mode filter using cross-slotted patch resonator for dual-band applications," Proceedings of International Microwave Symposium, Honolulu, Hawaii, pp. 921–924, 2007.
5. X. Zhang, Q. Xue, and B. Hu, "Planar tri-band bandpass filter with compact size, "IEEE Microwave and Wireless Components Letters, vol. 20, no. 5, pp. 262–264, May 2010.
6. H. Wu, Y. Chen, and Y. Chen, "Multi-layered dual-band bandpass filter using stub-loaded stepped-impedance and uniform-impedance resonators," IEEE Microwave and Wireless Components Letters, vol. 22, no. 3, pp. 114– 116, March 2012.
7. R. J. Cameron, R. Mansour, and C. M. Kudsia, "Microwave Filters for Communication Systems: Fundamentals, Design and Applications," WileyInterscience, New Jersey, 2007.
8. A. García-Lampérez, and M. Salazar-Palma, "SingleBand to Multiband Frequency Transformation for Multiband Filters," IEEE Transactions on Microwave

9. J. Lee, and K. Sarabandi, "A Synthesis Method for DualPassband Microwave Filters," IEEE Trans. Microw. Theory Techn, vol. 55, no. 6, pp. 1163-1170, June 2007.
10. T. G. Brand, P. Meyer, R. H. Geschke, "Designing multiband coupled resonator filters using reactance transformations," Int. J. of RF and Microwave
11. S. Yıldız, A. Aksen, S. B. Yarman, "Multiband Matching Network Design via Transformation based Real Frequency Approach", ISFEE, Romania, 29 June -1 July 2016.
12. N. Nallam and S. Chatterjee, "Design of concurrent multiband matching networks," International Symposium on Circuits and Systems, Rio de Janeiro, Brazil, 2011, pp. 201-204, May 15-19 2011.
13. S. B. Yarman, "Design of Ultra Wideband Power Transfer Networks", 1st ed., John Wiley & Sons Ltd., UK, 2010.
14. B. S. Yarman, H. J. Carlin, "A Simplified Real Frequency Technique Applied to Broadband Multistage Microwave Amplifiers", IEEE Transactions on Microwave Theory and Techniques, vol. 30, no. 12, pp. 2216-2222, 1982.
15. B. S. Yarman, (2013, June 25). High Precision Synthesis of a Richards Immittance via Parametric Approach, [Software], Available: www.siddikyarman.com.
16. B. S. Yarman, A. Aksen, et al. "Computer Aided Darlington Synthesis of an All Purpose Immittance Function," IU-JEEE vol. 16 no. 1, pp. 2027-2037, 2016.
17. N. Yıldırım, "Filpro Manual: A textbook-like manual for the filter design software Filpro", Middle East Technical University, Ankara, Turkey, 1997.