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2017-02-19
A 70 MHz ~270 MHz Electrical Tunable LC Bandpass Filter Based on Mixed Coupling and Cross-Coupling
By
Progress In Electromagnetics Research Letters, Vol. 66, 45-51, 2017
Abstract
This paper presents an electrical tunable bandpass filter based on tunable LC resonators loaded with semiconductor varactors. Magnetic dominated mixed coupling between the tunable resonators is utilized to compensate the bandwidth of the tunable filter. Cross coupling is created by using magnetic dominated mixed coupling between the resonators and source to load electrical coupling, and two transmission zeros are generated beside the pass band. The tunable mechanism of the proposed filter is studied. The tunable filter is analyzed, designed, fabricated and measured. The measurement shows that the filter can be tuned from 70 MHz to 270 MHz with a fractional bandwidth from 27% to 21%.
Citation
Linzhi Liu, Qian-Yin Xiang, Xiangrong Hu, Zongliang Zheng, Zhixiong Di, and Quanyuan Feng, "A 70 MHz ~270 MHz Electrical Tunable LC Bandpass Filter Based on Mixed Coupling and Cross-Coupling," Progress In Electromagnetics Research Letters, Vol. 66, 45-51, 2017.
doi:10.2528/PIERL16120104
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