A novel dual-band filter power divider (DB-FPD) with controllable transmission zeros (TZs) is designed using a slotline multimode resonator (SLMR) in this letter. Using the stub loading technology, each resonator mode of the SLMR can be easily controlled. Accordingly, a dual-band bandpass filter is realized. Four TZs are generated due to the loaded stubs on the SLMR and feeding network, which can improve the out-of-band selectivity. Finally, without introducing additional circuits, a DB-FPD with good performance is realized. For verification, a prototype operating at 2.01 and 4.79 GHz is fabricated and measured. The measured results are basically consistent with simulated ones. The 3-dB fractional bandwidths are 29.7% (1.72~2.32 GHz) and 7.99% (4.58~4.96 GHz), respectively, and the isolation in each band is better than 14 dB.
2. Wang, Y., et al., "Compact dual-band filtering power divider based on SIW triangular cavities," Electronics Letters, Vol. 54, No. 18, 1072-1074, 2018.
3. Chen, C. J., "A coupled-line isolation network for the design of filtering power dividers with improved isolation," IEEE Transactions on Components, Packaging and Manufacturing Technology, Vol. 8, No. 10, 1830-1837, 2018.
4. Deng, P. H. and L. C. Dai, "Unequal Wilkinson power dividers with favorable selectivity and high-isolation using coupled-line filter transformers," IEEE Transactions on Microwave Theory and Techniques, Vol. 60, No. 6, 1520-1529, 2012.
5. Zhang, G., et al., "Multilayer packaging SIW three-way filtering power divider with adjustable power division," IEEE Transactions on Circuits and Systems II: Express Briefs, Vol. 67, No. 12, 3003-3007, 2020.
6. Li, Y. C., Q. Xue, and X. Y. Zhang, "Single-and dual-band power dividers integrated with bandpass filters," IEEE Transactions on Microwave Theory and Techniques, Vol. 61, No. 1, 69-76, 2012.
7. Li, Q., Y. Zhang, and Y. Fan, "Dual-band in-phase filtering power dividers integrated with stub-loaded resonators," IET Microwaves, Antennas & Propagation, Vol. 7, 695-699, 2015.
8. Zhang, G., X. Wang, and J. Yang, "Dual-band microstrip filtering power divider based on one single multimode resonator," IEEE Microwave And Wireless Components Letters, Vol. 28, No. 10, 891-893, 2018.
9. Li, Q., Y. Zhang, and C. T. M. Wu, "High-selectivity and miniaturized filtering Wilkinson power dividers integrated with multimode resonators," IEEE Transactions on Components, Packaging and Manufacturing Technology, Vol. 7, No. 12, 1990-1997, 2017.
10. Jia, X., S.-J. Fang, H. Liu, and Z. Wang, "Compact dual-band Wilkinson power divider terminated with frequency-dependent complex impedances," Progress In Electromagnetics Research Letters, Vol. 91, 85-91, 2020.
11. Wu, L., S. Wang, L. Li, and C. Tang, "Compact microstrip UWB power divider with dual notched bands using dual-mode resonator," Progress In Electromagnetics Research Letters, Vol. 75, 39-45, 2018.
12. Ren, B., et al., "Compact dual-band bandpass filter and diplexer using hybrid resonant structure with independently controllable dual passbands," International Journal of RF and Microwave Computer-Aided Engineering, Vol. 29, No. 1, e21435, 2019.