volume | PIER Journals

Abstract

An inline quarter-mode substrate integrated waveguide (QMSIW) filter with controllable finite transmission zeros (FTZs) is presented based on a novel frequency-dependent coupling structure, which is constructed by a microstrip line with a pair of symmetric metallized via/buried holes and a magnetic coupling iris between two resonant cavities. FTZ can be independently introduced and controlled on both sides of passband to achieve high selectivity while keeping the filter compact configuration unchanged. For demonstration, the proposed structure is analyzed in detail. An inline fourth-order QMSIW bandpass filter (BPF) with two upper FTZs is designed, fabricated, and measured. The synthesis results, EM results, and measured results are in accordance with each other, which confirms the effectiveness of the proposed method.

1. He, Y. X., M. Giuseppe, G. Wang, W. T. Wu, L. G. Sun, L. Wang, and R. Zhang, "A direct matrix synthesis for in-line filters with transmission zeros generated by frequency-variant couplings," IEEE Trans. Microw. Theory Tech., Vol. 66, No. 4, 1780-1789, 2018.
doi:10.1109/TMTT.2018.2791940 Google Scholar

2. He, Y. X., M. Giuseppe, Z. W. Ma, L. G. Sun, and Y. Nobuyuki, "Advanced direct synthesis approach for high selectivity in-line topology filters comprising N-1 adjacent frequency-variant couplings," IEEE Access, Vol. 7, 41659-41668, 2019.
doi:10.1109/ACCESS.2019.2907531 Google Scholar

3. Lukasz, S., L. Natalia, and M. Michal, "A linear phase filter in quadruplet topology with frequencydependent couplings," IEEE Microw. Wirel. Compon. Lett., Vol. 24, No. 1, 32-34, 2014.
doi:10.1109/LMWC.2013.2288178 Google Scholar

4. Liu, Q., D. F. Zhou, D. W. Zhang, and D. L. Lv, "A novel frequency-dependent coupling with flexibly controllable slope and its applications on substrate-integrated waveguide filters," IEEE Microw. Wirel. Compon. Lett., Vol. 28, No. 11, 993-995, 2018.
doi:10.1109/LMWC.2018.2872325 Google Scholar

5. Liu, Q., D. F. Zhou, D. W. Zhang, and D. L. Lv, "SIW bandpass filters in modified box-section scheme with bypass/constant/frequency-dependent coupling in diagonal cross-coupling path," IET Microw. Antennas Propag., Vol. 13, No. 5, 559-566, 2019.
doi:10.1049/iet-map.2018.5361 Google Scholar

6. Leszczynska, N., S. Lukasz, and M. Micha, "A novel synthesis technique for microwave bandpass filters with frequency-dependent couplings," Progress In Electromagnetics Research, Vol. 137, 35-50, 2013.
doi:10.2528/PIER13011007 Google Scholar

7. Gong, K., W. Hong, Y. Zhang, P. Chen, and C. J. You, "Substrate integrated waveguide quasielliptic filters with controllable electric and magnetic mixed coupling," IEEE Trans. Microw. Theory Tech., Vol. 60, No. 10, 3071-3078, 2012.
doi:10.1109/TMTT.2012.2209437 Google Scholar

8. Lukasz, S., J. Andrzej, and M. Michal, "A trisection filter design with negative slope of frequencydependent cross coupling implemented in substrate integrated waveguide (SIW)," IEEE Microw. Wirel. Compon. Lett., Vol. 23, No. 9, 456-458, 2013.
doi:10.1109/LMWC.2013.2272611 Google Scholar

9. Lukasz, S., L. Adam, and M. Michal, "Coupled-resonator waveguide filter in quadruplet topology with frequency-dependent coupling — A design based on coupling matrix," IEEE Microw. Wirel. Compon. Lett., Vol. 22, No. 11, 553-555, 2012.
doi:10.1109/LMWC.2012.2225604 Google Scholar

10. Lukasz, S., L. Natalia, and M. Michal, "Generalized Chebyshev bandpass filters with frequencydependent couplings based on stubs," IEEE Trans. Microw. Theory. Tech., Vol. 61, No. 10, 3601-3612, 2013.
doi:10.1109/TMTT.2013.2279777 Google Scholar

11. Zhu, F., W. Hong, J. X. Chen, and K. Wu, "Quarter-wavelength stepped-impedance resonator filter with mixed electric and magnetic coupling," IEEE Microw. Wirel. Compon. Lett., Vol. 24, No. 2, 90-92, 2014.
doi:10.1109/LMWC.2013.2290225 Google Scholar

12. Amari, S., F. Seyfert, and M. Bekheit, "Theory of coupled resonator microwave bandpass filters of arbitrary bandwidth," IEEE Trans. Microw. Theory Tech., Vol. 58, No. 8, 2188-2203, 2010.
doi:10.1109/TMTT.2010.2052874 Google Scholar

13. Lukasz, S., L. Adam, and M. Michal, "Coupled-resonator filters with frequency-dependent couplings: coupling matrix synthesis," IEEE Microw. Wirel. Compon. Lett., Vol. 22, No. 6, 312-314, 2012.
doi:10.1109/LMWC.2012.2197386 Google Scholar

14. Stefano, M., T. Cristiano, B. Maurizio, and P. Luca, "Quarter-mode cavity filters in substrate integrated waveguide technology," IEEE Trans. Microw. Theory Tech., Vol. 64, No. 8, 2538-2547, 2016.
doi:10.1109/TMTT.2016.2577690 Google Scholar

15. Zhang S., X. D. Fu, J. J. Cheng, D. Q. Cheng, H. T. Wang, F. L. Liu, and L. C. Bao, "Compact balanced bandpass filter with the fractal defected structures," IEICE Electron. Expr., Vol. 15, No. 15, 1-6, 2018. Google Scholar

16. Li, P., H. Chu, and R. S. Chen, "Design of compact bandpass filters using quarter-mode and eighthmode SIW cavities," IEEE Trans. Compon. Packaging Manuf. Technol., Vol. 7, No. 6, 956-963, 2017.
doi:10.1109/TCPMT.2017.2677958 Google Scholar

17. Phirun, K. and J. Yongchae, "Compact and wide stopband substrate integrated waveguide bandpass filter using mixed quarter- and one-Eighth modes cavities," IEEE Microw. Wirel. Compon. Lett., Vol. 30, No. 1, 16-19, 2020.
doi:10.1109/LMWC.2019.2954603 Google Scholar

18. Wang, X., X. W. Zhu, Z. H. Jiang, Z. C. Hao, Y. W. Wu, and W. Hong, "Analysis of eighth-mode substrate-integrated waveguide cavity and flexible filter design," IEEE Trans. Microw. Theory Tech., Vol. 67, No. 7, 1-12, 2019.
doi:10.1109/TMTT.2019.2913646 Google Scholar

19. Liu, Q., D. F. Zhou, D. Zhang, S. Wang, and D. Lv, "Compact cross-coupled quarter-mode SIW bandpass filters with different locations of input and output ports," 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 1-3, Guangzhou, China, 2019. Google Scholar

Dr. Zhiwei Shi

Dr. Guo Hui Li

Dr. Yulu Song

Dr. Binbin Cheng