Vol. 98

Latest Volume
All Volumes
All Issues
2021-06-02

Synthesis of in-Line Fully Canonical Response Filters with Frequency-Variant Couplings

By Angel Triano and Pedro de Paco
Progress In Electromagnetics Research Letters, Vol. 98, 49-54, 2021
doi:10.2528/PIERL21031303

Abstract

A direct synthesis approach is presented to realize in-line topology filters with adjacent frequency-variant couplings implementing a transmission response with the same number of finite transmission zeros as poles. The proposed method starts with an N-order fully canonical filter response definition. A non-resonant node (NRN) is incorporated into the transversal network to make room for an extra coupling, and as a consequence of the extended similarity transformation applied, the NRN is transformed into a resonant node. The result is a network with N poles and N transmission zeros implemented with N+1 resonant nodes and N FVC, being able to describe a fully canonical response with an inline network without cross couplings.

Citation


Angel Triano and Pedro de Paco, "Synthesis of in-Line Fully Canonical Response Filters with Frequency-Variant Couplings," Progress In Electromagnetics Research Letters, Vol. 98, 49-54, 2021.
doi:10.2528/PIERL21031303
http://jpier.org/PIERL/pier.php?paper=21031303

References


    1. Szydlowski, L., A. Lamecki, and M. Mrozowski, "Coupled-resonator filters with frequency-dependent couplings: coupling matrix synthesis," IEEE Microwave and Wireless Components Letters, Vol. 22, No. 6, 312-314, 2012.
    doi:10.1109/LMWC.2012.2197386

    2. Tamiazzo, S. and G. Macchiarella, "Synthesis of cross-coupled filters with frequency-dependent couplings," IEEE Transactions on Microwave Theory and Techniques, Vol. 65, No. 3, 775-782, 2017.
    doi:10.1109/TMTT.2016.2633258

    3. Zhao, P. and K. Wu, "Cascading fundamental building blocks with frequency-dependent couplings in microwave filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 4, 1432-1440, 2019.
    doi:10.1109/TMTT.2019.2895532

    4. Zhu, F., W. Hong, J. Chen, and K. Wu, "Quarter-wavelength stepped-impedance resonator filter with mixed electric and magnetic coupling," IEEE Microwave and Wireless Components Letters, Vol. 24, No. 2, 90-92, 2014.
    doi:10.1109/LMWC.2013.2290225

    5. Zhang, S., L. Zhu, and R. Weerasekera, "Synthesis of inline mixed coupled quasi-elliptic bandpass filters based on λ/4 resonators," IEEE Transactions on Microwave Theory and Techniques, Vol. 63, No. 10, 3487-3493, 2015.
    doi:10.1109/TMTT.2015.2467380

    6. Wang, H. and Q. Chu, "An inline coaxial quasi-elliptic filter with controllable mixed electric and magnetic coupling," IEEE Transactions on Microwave Theory and Techniques, Vol. 57, No. 3, 667-673, 2009.
    doi:10.1109/TMTT.2009.2013290

    7. He, Y., G. Wang, L. Sun, L. Wang, R. Zhang, and G. Rushingabigwi, "Direct matrix synthesis for in-line filters with transmission zeros generated by frequency-variant couplings," 2017 IEEE MTT-S International Microwave Symposium (IMS), 356-359, 2017.
    doi:10.1109/MWSYM.2017.8059119

    8. He, Y., G. Macchiarella, G. Wang, W. Wu, L. Sun, L. Wang, and R. Zhang, "A direct matrix synthesis for in-line filters with transmission zeros generated by frequency-variant couplings," IEEE Transactions on Microwave Theory and Techniques, Vol. 66, No. 4, 1780-1789, 2018.
    doi:10.1109/TMTT.2018.2791940

    9. Zhang, Y.-L., "Direct matrix synthesis for in-line diplexers with transmission zeros generated by Frequency Variant Couplings," Progress In Electromagnetics Research M, Vol. 78, 45-52, 2018.
    doi:10.2528/PIERL18062502

    10. Zhang, Y.-L., "Improved matrix synthesis for inline filters with transmission zeros generated by FVC," Progress In Electromagnetics Research M, Vol. 76, 9-17, 2018.
    doi:10.2528/PIERM18101502

    11. Li, G., "Coupling matrix optimization synthesis for filters with constant and Frequency-Variant Couplings," Progress In Electromagnetics Research Letters, Vol. 82, 73-80, 2019.
    doi:10.2528/PIERL19011103

    12. He, Y., G. Macchiarella, Z. Ma, L. Sun, and N. Yoshikawa, "Advanced direct synthesis approach for high selectivity in-line topology filters comprising N − 1 adjacent Frequency-Variant Couplings," IEEE Access, Vol. 7, 41 659-41 668, 2019.
    doi:10.1109/ACCESS.2019.2907531

    13. Cameron, R., C. Kudsia, and R. Mansour, Microwave Filters for Communication Systems: Fundamentals, Design, and Applications, Wiley, 2018.
    doi:10.1002/9781119292371

    14. He, Y., G. Wang, X. Song, and L. Sun, "A coupling matrix and admittance function synthesis for mixed topology filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 64, No. 12, 4444-4454, Dec. 2016.
    doi:10.1109/TMTT.2016.2614666