Compact wideband bandpass filter with sharp selectivity using short-ended parallel-coupled-line-stub resonator

Xiaohu Wu,Junxiang Ge

doi:10.1109/apmc.2015.7413496

Compact wideband bandpass filter with sharp selectivity using short-ended parallel-coupled-line-stub resonator

Xiaohu Wu, Junxiang Ge

https://doi.org/10.1109/apmc.2015.7413496

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Publication Date: Dec 1, 2015

Citations: 7

Affiliation: Nanjing University of Information Science and Technology

#Compact Wideband Bandpass Filter #Sharp Selectivity + Show 8 more

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Abstract

A compact wideband bandpass filter is presented in this paper. By loading the short-ended parallel-coupled-line-stub (PCLS) at the center of the uniform-impedance half-wavelength line, the tri-mode resonator is realized. Two transmission zeros, due to the PCLS, are generated at the lower and upper cut-off frequencies and sharp selectivity can be obtained. The short-ended PCLS resonator is theoretically analyzed and applied to design a bandpass filter with fractional bandwidths 45%, good in-band return loss (>12.2dB) and low insertion loss (0.9dB at the center frequency 4.0GHz).

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