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High-selectivity single-ended and balanced bandpass filters using ring resonators and coupled lines loaded with multiple stubs
Authors
QH Liu
Y Liu
Z Luo
KD Xu
Publication date
1 November 2018
Publisher
'Elsevier BV'
Doi
Cite
Abstract
© 2018 Elsevier GmbH High-selectivity single-ended and balanced bandpass filters (BPFs) using dual-mode ring resonators and coupled lines loaded with multiple stubs are proposed in this paper. With the help of the loaded short-circuited and open-circuited stubs, six deep transmission zeros (TZs) from 0 to 2f0 (f0: center frequency of the passband) can be realized in both of single-ended and balanced BPFs to improve the stopband suppressions. The functions of the loaded short/open stubs and calculated analysis of TZs’ positions have been presented. For further demonstration, two examples of single-ended BPF and balanced BPF with high common-mode suppression are designed and fabricated, whose center frequencies are both at 2.1 GHz. Their measured 3-dB fractional bandwidths are 23.7% and 24.7% (differential-mode), respectively. The simulated results and measurements of these two filters are in good agreement
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Last time updated on 18/10/2019