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Balanced Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line
Yang L.; Choi W.-W.; Tam K.-W.; Zhu L.
2015-07-01
Source PublicationIEEE Transactions on Microwave Theory and Techniques
ISSN00189480
Volume63Issue:7Pages:2225-2232
Abstract

This paper presents a novel balanced dual-band bandpass filter with in-band common-mode suppression via multiple transmission zeros from the doubly short-ended coupled line. Through the analysis of coupled line structures, the transmission zeros in the differential- and common-mode equivalent circuits are extensively studied. In differential-mode, the transmission zeros, produced by both short-ended coupled line and open stub, are independently controlled, and the desired two resonant frequencies of the dual-band bandpass filter are achieved by studying the characteristics of the doubly short-ended half-wavelength resonator. For the common-mode suppression, the intrinsic transmission zeros of short-ended coupled line in differential-mode structure appear in the same frequency locations due to the proposed common-mode strcuture. With proper adjustment of the impedances and electrical lengths of the terminated stepped-impedance resonators (SIRs) on the symmetric plane, additional transmission zeros are introduced and relocated at the differential-mode resonant frequencies, thus producing good in-band common-mode signal attenuation as highly expected. As the attractive advantage of proposed balanced structure, the common-mode performance is independent of differential-mode one. To verify the proposed design method, a prototype balanced dual-band filter is theoretically analyzed, simulated, and experimentally measured, good agreements between simulated and measured results are obtained. The measured balanced dual-band bandpass filter is centered at 900 MHz and 2.49 GHz, and in-band common-mode rejection for first and second passbands are presented with higher than 30 and 40 dB, respectively.

KeywordBalanced Filter Common-mode Suppression Dual-band Multiple Transmission Zeros Short-ended Coupled Line Stepped-impedance Resonator (Sir)
DOI10.1109/TMTT.2015.2431679
URLView the original
Indexed BySCI
WOS Research AreaEngineering
WOS SubjectEngineering, Electrical & Electronic
WOS IDWOS:000357622300015
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Citation statistics
Cited Times [WOS]:33   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionDEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
AffiliationUniversidade de Macau
Recommended Citation
GB/T 7714
Yang L.,Choi W.-W.,Tam K.-W.,et al. Balanced Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line[J]. IEEE Transactions on Microwave Theory and Techniques,2015,63(7):2225-2232.
APA Yang L.,Choi W.-W.,Tam K.-W.,&Zhu L..(2015).Balanced Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line.IEEE Transactions on Microwave Theory and Techniques,63(7),2225-2232.
MLA Yang L.,et al."Balanced Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line".IEEE Transactions on Microwave Theory and Techniques 63.7(2015):2225-2232.
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