A compact wideband bandpass filter (BPF) based on half-mode substrate integrated waveguide (HMSIW) is proposed in this paper. The proposed BPF is achieved by etching a couple of S-shaped complementary spiral resonators (S-CSRs) on the top layer of HMSIW cavity to achieve a wide passband as well as generate two transmission zeros in the vicinity of the passband respectively to improve the selectivity. In addition, compared with a conventional CSRs-loaded HMSIW structure, the proposed S-CSRs-loaded HMSIW makes the overall size of the filter largely reduced with the same electrical length. Among the HMSIW structures ever reported, the proposed S-CSRs are the first time to be introduced into HMSIW. To validate its practicability, a compact wideband HMSIW BPF loaded with S-SCRs has been designed and implemented through the PCB process. The measured and simulated S-parameters of the filter are presented to show the proposed filter's predicted performance, and good agreements is obtained between them. This result demonstrates that the newly proposed HMSIW structure loaded with S-CSRs is an excellent candidate for compact filters.
2. Deslandes, D. and K. Wu, "Single-substrate integration technique for planar circuits and waveguide filters," IEEE Trans. Microw. Theory Tech., Vol. 51, 593-596, 2003.
doi:10.1109/TMTT.2002.807820
3. Zhang, Q.-L., et al., "Compact substrate integrated waveguide (SIW) bandpass filter with complementary split-ring resonators (CSRRs)," IEEE Microw. Wireless Compon. Lett., Vol. 20, 426-428, 2010.
doi:10.1109/LMWC.2010.2049258
4. Chen, X.-P. and K. Wu, "Substrate integrated waveguide cross-coupled filter with negative coupling structure," IEEE Trans. Microw. Theory Tech., Vol. 56, 142-149, 2008.
doi:10.1109/TMTT.2007.912222
5. Huang, L. W. and H. Cha, "Novel half-mode substrate integrated waveguide filters with modified broadside-coupled split ring resonators," IEEE 16th International Conference on Communication Technology (ICCT), 548-552, 2015.
doi:10.1109/ICCT.2015.7399898
6. Cross, L. W., M. J. Almalkawi, and V. K. Devabhaktuni, "Half mode substrate-integrated waveguide-loaded evanescent-mode bandpass filter," International Journal of Rf & Microwave Computer-aided Engineering, Vol. 23, No. 2, 172-177, 2013.
7. Dong, Y. D., T. Yang, and T. Itoh, "Substrate integrated waveguide loaded by complementary split-ring resonators and its applications to miniaturized waveguide filters," IEEE Trans. Microw. Theory Tech., Vol. 57, 2211-2223, 2009.
doi:10.1109/TMTT.2009.2027156
8. Huang, Y. M., Z. H. Shao, W. Jiang, T. Huang, and G. A. Wang, "Half-mode substrate integrated waveguide bandpass filter loaded with horizontal-asymmetrical stepped-impedance complementary split-ring resonators," Electron. Lett., Vol. 52, 1034-1036, 2016.
doi:10.1049/el.2016.0372
9. Camdoo, R., S. M. Lau, and H. T. Su, "Compact cross-coupled half-mode substrate integrated waveguide bandpass filter," IEEE Asia Pacific Microwave Conference, 706-709, IEEE, 2017.
10. Horestani, A. K., M. Duran-Sindreu, J. Naqui, C. Fumeaux, and F. Martin, "Coplanar waveguides loaded with S-shaped split-ring resonators: Modeling and application to compact microwave filters," IEEE Antennas Wireless Propag. Lett., Vol. 13, 1349-1352, 2014.
doi:10.1109/LAWP.2014.2337913
Submit
