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2015-08-23
High Selectivity Balanced Bandpass Filter with Tunable Bandwidth Using Stub-Loaded Resonator
By
Progress In Electromagnetics Research Letters, Vol. 55, 89-95, 2015
Abstract
A new balanced bandpass filter (BPF) with tunable bandwidth using tri-mode stub-loaded resonators is proposed. To tune the differential-mode bandwidth, the two even-mode resonance frequencies and two transmission zeros (TZs) are tuned while the odd-mode resonance frequency keeps unchanged. To realize high selectivity for differential mode, another two TZs are created by the source-load coupling and coupling sections. Furthermore, wideband common-mode (CM) suppression is achieved. The fabricated filter has 3-dB fractional bandwidth ranging from 20.0% to 26.0% centered at 1.71 GHz and wideband suppression (17 dB from 2 to 4.4 GHz) for the differential mode, as well as common-mode suppression better than 20 dB from 0 to 4.5 GHz.
Citation
Ya-Lin Ma, Wenquan Che, Jian-Xin Chen, and Wenjie Feng, "High Selectivity Balanced Bandpass Filter with Tunable Bandwidth Using Stub-Loaded Resonator," Progress In Electromagnetics Research Letters, Vol. 55, 89-95, 2015.
doi:10.2528/PIERL15052804
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