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Triple-mode bandpass filters on stub-loaded resonator with novel I/O coupling scheme
Songbai Zhang; Lei Zhu
Conference Name2012 Asia Pacific Microwave Conference
Source Publication2012 Asia Pacific Microwave Conference Proceedings
Conference Date4-7 Dec. 2012
Conference PlaceKaohsiung, Taiwan

In this paper, a novel I/O stage coupling scheme is presented for exploration of a triple-mode bandpass filter with improved out-of-band performance. A triple-mode stub-loaded resonator is first formed by tap-connecting a λ/2 resonator with a pair of open-ended stubs of less than λ/4 in length at its two symmetrical positions. Thus, three resonant modes are excited to make up a three-pole passband, above which a transmission zero is produced as well. Next, these two stubs are flared apart to create an additional pair of transmission zeros in the lower stopband and the U-shaped I/O coupled lines are applied to suppress the inherent spurious response of the stub-loaded resonator. As a result, a triple-mode bandpass filter, which is self-contained with two transmission zeros at both upper and lower stopbands, is constituted. Finally, the two proposed triple-mode bandpass filters are designed and fabricated to provide an experimental validation for the predicted performances.

KeywordMulti-conductor Coupled Lines Spurious Suppression Stub-loaded Resonator And Triple-mode Resonator
Indexed BySCIE
WOS Research AreaTelecommunications
WOS SubjectTelecommunications
WOS IDWOS:000319213700177
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Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeConference paper
CollectionFaculty of Science and Technology
AffiliationElectrical & Electronic Engineering, Nanyang Technological University Nanyang Avenue, Singapore 639798
Recommended Citation
GB/T 7714
Songbai Zhang,Lei Zhu. Triple-mode bandpass filters on stub-loaded resonator with novel I/O coupling scheme[C],2012.
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