volume | PIER Journals

Abstract

A substrate-integrated waveguide (SIW) miniaturization filter is proposed, which features high attenuation characteristics, effectively reduces filter loss and size, and improves frequency selectivity. The filter is miniaturized using the evanescent-mode theory and embeds a nested U-shaped resonator in the upper metal surface of the SIW. The proposed filter's equivalent circuit structure incorporates two LC parallel resonant loops with resistance characteristics that can, in turn, create two transmission zeros in the filter's stopband to enhance its selectivity. The filter has an effective size of only 0.39λ_g×0.23λ_g with a center frequency of 2.5 GHz. The -3 dB bandwidth measures 120 MHz, while the relative bandwidth is 4.8%. The insertion loss is -0.6 dB in the passband, and the return loss is more than 25 dB. Out-of-band rejection exceeds 40 dB in the range of 2.9~4.4 GHz. The measured and simulated results agree well. The filter offers benefits in terms of high rejection, miniaturization, and low insertion loss. It can be implemented in 5G (sub-6 GHz) wireless communication systems.

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, Jun. 2011.
doi:10.1049/iet-map.2010.0463

2. Chen, Xiao-Ping and Ke Wu, "Substrate integrated waveguide filter: Basic design rules and fundamental structure features," IEEE Microwave Magazine, Vol. 15, No. 5, 108-116, 2014.

3. Moscato, Stefano, Cristiano Tomassoni, Maurizio Bozzi, and Luca Perregrini, "Quarter-mode cavity filters in substrate integrated waveguide technology," IEEE Transactions on Microwave Theory and Techniques, Vol. 64, No. 8, 2538-2547, Aug. 2016.
doi:10.1109/TMTT.2016.2577690

4. Jones, Thomas R. and Mojgan Daneshmand, "Miniaturized folded ridged half-mode and quarter-mode substrate integrated waveguides for filter design," IEEE Transactions on Microwave Theory and Techniques, Vol. 67, No. 8, 3414-3426, Aug. 2019.
doi:10.1109/TMTT.2019.2918519

5. Qin, Runlian, Dan Zhang, Zhendong Ding, and Mengrou Wang, "Duel-band filter with high out-of-band rejection using ACSRR-SIW technology," IEICE Electronics Express, Vol. 17, No. 12, 20190743, Jun. 2020.
doi:10.1587/elex.17.20190743

6. Liu, Qing, Dongfang Zhou, Jian Shi, and Tao Hu, "High-selective triple-mode SIW bandpass filter using higher-order resonant modes," Electronics Letters, Vol. 56, No. 1, 37-39, 2019.
doi:10.1049/el.2019.3234

7. Zhang, Xiangou and Mengxia Yu, "A SIW filter with square complementary split-ring resonators (CSRRs)," 2017 USNC-URSI Radio Science Meeting, 45-46, IEEE, NY, USA, Jul. 2017.

8. Shen, Wei and Hao-Ran Zhu, "Vertically stacked trisection SIW filter with controllable transmission zeros," IEEE Microwave and Wireless Components Letters, Vol. 30, No. 3, 237-240, 2020.

9. Delmonte, Nicoló, Maurizio Bozzi, Luca Perregrini, and Cristiano Tomassoni, "Miniaturized SIW filters based on shielded quarter-mode cavities," 2019 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO), 1-3, IEEE, NY, USA, May 2019.

10. Guo, Hui, Xiang An, and Zhi-Qing Lv, "Dual-mode bandpass substrate integrated waveguide filter with a complementary split ring resonator," Microwave and Optical Technology Letters, Vol. 60, No. 3, 735-741, Mar. 2018.
doi:10.1002/mop.31039

11. Liu, Jun-Ping, Zhi-Qing Lv, and Xiang An, "Compact substrate integrated waveguide filter using dual-plane resonant cells," Microwave and Optical Technology Letters, Vol. 58, No. 1, 111-114, Jan. 2016.
doi:10.1002/mop.29501

12. Danaeian, Mostafa, Ali-Reza Moznebi, and Kambiz Afrooz, "Super compact dual-band substrate integrated waveguide filters and filtering power dividers based on evanescent-mode technique," AEU-International Journal of Electronics and Communications, Vol. 125, 153348, Oct. 2020.
doi:10.1016/j.aeue.2020.153348

Prof. Xiaohei Yan

Professor Wenjing Mu

Professor Minjie Guo

Dr. Xiumei Huang

Dr. Haiyan Zeng