[1] [1] NOURI L, NKENYEREYE L, HAFEZ A M, et al. A simplified and efficient approach for designing microstrip bandpass filters: Applications in satellite and 5G communications [J]. AEUE International Journal of Electronics and Communications, 2024, 177：155189.

[2] [2] MAKIMOTO M, YAMASHITA S. Compact bandpass filters using stepped impedance resonators [J]. Proceedings of the IEEE, 1979, 67(1):16-19.

[3] [3] MAKIMOTO M, ENDOH H, YAMASHITA S, et al. Compact duplexer for 400 MHz band land mobile radio equipment [C]∥Canada:33rd IEEE Veh Technol Conf Dig, 1983:201-204.

[4] [4] QI Shishan, GUO Yue, WU Wen. Wideband filtering waveguide antenna based on the stepped impedance resonator [J]. IET Microwaves, Antennas Propagation, 2022, 17(3):183-189.

[5] [5] XI Shangjing, GUO Jianying, JIANG Yannan, et al. Compact dual-band narrowband bandpass filter with small frequency ratio [J]. Frequenz,2023,77(9/10):519-524.

[7] [7] WANG Yunxiu, CHEN Yuanli, ZHOU Wenhui, et al. Dual-band bandpass filter design using stub-loaded hairpin resonator and meandering uniform impedance resonator [J]. Progress In Electromagnetics Research Letters, 2021,95:147-153.

[8] [8] FANG Ruihong, GUAN Xuehui, REN Baoping, et al. Compact dual-band bandpass filter based on EMSICC and CPW resonator with excellent design flexibility [J]. Microwave and Optical Technology Letters,2024,66(1): e33973.

[9] [9] LI Daotong, WANG Ju’an, LIU Ying, et al. Miniaturized dual-band bandpass filter with sharp roll-off using ring-loaded resonator [J]. IEEE Access, 2020, 8:25588-25595.

[10] [10] YUE Juan, ZHANG Guanmao, CHE Zonge, et al. Compact dual-band bandpass filter based on SSL-SIR with sharp roll-off [J]. The Applied Computational Electromagnetics Society Journal (ACES),2021,36(12):1623-1629.