volume | PIER Journals

2023-11-07

DGS Loaded Substrate Integrated Waveguide Dual Mode Cavity Filter

Xiaohei Yan,

Prof. Xiaohei Yan

School of Mathematics and Electronic Information Engineering

Guangxi Minzu Normal University

China

Homepage

Wenjing Mu,

Professor Wenjing Mu

School of Mathematics, Physics, and Electronic Information Engineering

Guangxi Minzu Normal University

China

Homepage

Minjie Guo

Professor Minjie Guo

School of Mathematics and Electronic Information Engineering

Guangxi Minzu Normal University

China

Homepage

Progress In Electromagnetics Research M, Vol. 120, 155-165, 2023

doi:10.2528/PIERM23082403

Abstract

A novel substrate-integrated waveguide (SIW) dual-mode cavity bandpass filter with loaded defected ground structure (DGS) is proposed. The SIW dual-mode cavity operates in two modes, TE₁₁₀ and TE₁₂₀, and the field distribution of the TE₁₁₀ mode is altered by installing a metal perturbation aperture in the middle of the cavity to bring its resonance frequency close to that of the TE₁₂₀ mode, thus forming a bandpass filter with two resonance points in the passband. A DGS structure is embedded at the ground level of the SIW to introduce a transmission zero in the high-frequency rejection band, thus improving the rejection performance of the filter for the high-frequency rejection band. The simulated and measured results show that the center frequency of the filter is 3.75 GHz; the 3 dB bandwidth is 0.3 GHz; the relative bandwidth is 8%; the return loss is less than -15 dB; and the insertion loss in the passband obtained from the simulation is about -0.35 dB, while that obtained from the measurement is 0.4 dB lower than that of the simulation, and the filter has a transmission zero near the high-frequency stopband of 6 GHz, which enables the high-frequency parasitic passband to move away from the passband of the filter. Except for the passband, all other signals in the Sub-6 GHz band can be effectively suppressed by the filter. This design combines the SIW dual-mode cavity with the DGS structure to design the filter, which can realize the flexible adjustment of bandwidth and transmission zero point, and the design method is simple and innovative. The filter can be applied to the 5G n77 frequency band, which has certain application value.

Citation

Copy Export

Xiaohei Yan, Wenjing Mu, and Minjie Guo, "DGS Loaded Substrate Integrated Waveguide Dual Mode Cavity Filter," Progress In Electromagnetics Research M, Vol. 120, 155-165, 2023.
doi:10.2528/PIERM23082403

References

1. Bozzi, M., A. Georgiadis, and K. Wu, "Review of substrate-integrated waveguide circuits and antennas," IET Microwaves, Antennas & Propagation, Vol. 5, No. 8, 909-920, 2011.
doi:10.1049/iet-map.2010.0463

2. Chen, X.-P. and K. Wu, "Substrate integrated waveguide filter: Basic design rules and fundamental structure features," IEEE Microwaves Magazine, Vol. 15, No. 5, 108-116, 2014.
doi:10.1109/MMM.2014.2321263

3. Saghati, A. P., A. P. Saghati, and K. Entesari, "Ultra-miniature SIW cavity resonators and filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 63, No. 12, 4329-4340, 2015.
doi:10.1109/TMTT.2015.2494023

4. Schorer, J., J. Bornemann, and U. Rosenberg, "Mode-matching design of substrate mounted waveguide (SMW) components," IEEE Transactions on Microwave Theory and Techniques, Vol. 64, No. 8, 2401-2408, 2016.

5. Xu, S., K. Ma, F. Meng, and K. S. Yeo, "Novel defected ground structure and two-side loading scheme for miniaturized dual-band SIW bandpass filter designs," IEEE Microwave and Wireless Components Letters, Vol. 25, No. 4, 217-219, 2015.
doi:10.1109/LMWC.2015.2400916

6. Khandelwal, M. K., B. K. Kanaujia, and S. Kumar, "Defected ground structure: Fundamentals, analysis, and applications in modern wireless trends," Int. J. Antennas Propag., Vol. 2017, 2018527, 2017.

7. Kumar, C. and D. Guha, "Reduction in cross-polarized radiation of microstrip patches using geometry-independent resonant-type defected ground structure (DGS)," IEEE Trans. Antennas Propag., Vol. 63, No. 6, 2767-2772, 2015.
doi:10.1109/TAP.2015.2414480

8. Kumar, C. and D. Guha, "Asymmetric geometry of defected ground structure for rectangular microstrip: A new approach to reduce its cross-polarized fields," IEEE Trans. Antennas Propag., Vol. 64, No. 6, 2503-2506, 2016.
doi:10.1109/TAP.2016.2537360

9. Wei, K., J. Y. Li, L. Wang, R. Xu, and Z. J. Xing, "A new technique to design circularly polarized microstrip antenna by fractal defected ground structure," IEEE Trans. Antennas Propag., Vol. 65, No. 7, 3721-3725, 2017.
doi:10.1109/TAP.2017.2700226

10. Wei, K., J. Y. Li, L. Wang, Z. J. Xing, and R. Xu, "Mutual coupling reduction by novel fractal defected ground structure bandgap filter," IEEE Trans. Antennas Propag., Vol. 64, No. 10, 4328-4335, 2016.
doi:10.1109/TAP.2016.2591058

11. Sahu, S. K., S. Sahu, and G. Palai, "Experimentally validated of defected microstrip structure to realize band stop filter based on capacitively loaded loop resonators," Optik, Vol. 158, 610-616, 2018.
doi:10.1016/j.ijleo.2017.12.118

12. Chu, P., W. Hong, M. Tuo, et al. "In-line ports dual mode substrate integrated waveguide filter with flexible responses," IEEE Microwave and Wireless Components Letters, Vol. 28, No. 10, 882-884, 2018.
doi:10.1109/LMWC.2018.2861086

13. Tomassoni, C., L. Silvestri, A. Ghiotto, et al. "Substrate-integrated waveguide filters based on dual-mode air-filled resonant cavities," IEEE Transactions on Microwave Theory and Techniques, Vol. 66, No. 2, 726-736, 2018.
doi:10.1109/TMTT.2017.2786212

14. Li, J., W. Zheng, X. Wei, et al. "Millimeter-wave substrate integrated waveguide bandpass filters based on stepped-impedance E-shaped defected ground structures," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 32, No. 11, 126-138, 2022.

15. Shen, W., W. Y. Yin, and X. W. Sun, "Compact substrate integrated waveguide (SIW) filter with defected ground structure," IEEE Microwave and Wireless Components Letters, Vol. 21, 83-85, 2011.
doi:10.1109/LMWC.2010.2091402