Miniaturized hybrid ring bandpass filter with a notched band and an improved upper stopband using double-sided parallel-strip lines

A wideband stepped-impedance hybrid bandpass filter with a notched band and an improved upper stopband is proposed. The double-sided parallel-strip line (DSPSL) is employed to implement the proposed filter. The stepped-impedance structure improves the upper stopband performance and reduces the size....

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Bibliographic Details
Main Authors: Jian-Yu Li, Chun-Hsiang Chi, Chi-Yang Chang
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
double-sided parallel-strip line (DSPSL)
Filtering theory
hybrid ring
Impedance
notch
offset double-sided parallelstrip line (ODSPSL)
Passband
Resonator filters
stepped-impedance
Wideband
wideband bandpass filter
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Description
Summary:A wideband stepped-impedance hybrid bandpass filter with a notched band and an improved upper stopband is proposed. The double-sided parallel-strip line (DSPSL) is employed to implement the proposed filter. The stepped-impedance structure improves the upper stopband performance and reduces the size. Besides, the open-circuited stub embedded in the stepped-impedance line of the hybrid ring is used to create a notched band. The low impedance portion of the stepped-impedance line is formed by the DSPSL while the high impedance portion of that is constructed by the offset double-sided parallel-strip line (ODSPSL). The design example is fabricated on a 20 mil RO4003 substrate. The measurement results show excellent agreements with the electromagnetic simulation.
ISSN:2165-4727
2165-4743
DOI:10.1109/APMC.2012.6421562