Substrate-Integrated Waveguide Dual-Mode Dual-Band Bandpass Filters With Widely Controllable Bandwidth Ratios

A realization method, named the design parameters ratio technique, of substrate-integrated waveguide (SIW) dualmode dual-band bandpass filters (DM-DBBPFs) with widely controllable bandwidth ratios is presented when TE 101 and TE 201 modes in substrate-integrated rectangular cavities are exploited to...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2017-10, Vol.65 (10), p.3801-3812
Main Authors: Zhou, Kang, Zhou, Chun-Xia, Wu, Wen
Format: Article
Language:English
Subjects:
Apertures
Bandpass filters
Bandwidth
Cavity resonators
Controllable bandwidths
Coupling coefficients
Couplings
Design parameters
Dual band
dual-band bandpass filter (DBBPF)
dual-mode
Electromagnetic wave filters
external quality factors
Passband
Substrate integrated waveguides
substrate-integrated waveguide (SIW)
Substrates
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Summary:A realization method, named the design parameters ratio technique, of substrate-integrated waveguide (SIW) dualmode dual-band bandpass filters (DM-DBBPFs) with widely controllable bandwidth ratios is presented when TE 101 and TE 201 modes in substrate-integrated rectangular cavities are exploited to dominate the first and second passbands, respectively. Emphasis is placed on filters design to simultaneously realize the design parameters including the external quality factors Q e and coupling coefficients M ij required for both passbands by determining proper offset positions of the feeding ports and coupling windows, which can easily be fixed by ratios of synthesized Q e and M ij for the two bands, respectively. Consequently, the fractional bandwidths (FBWs) of the two passbands can be allocated flexibly over a wide range of ratios, typically with the FBW ratio of 0.2-1.5. Three SIW DM-DBBPFs including a thirdorder direct-coupled one operating at 12 and 16 GHz with the identical absolute bandwidths, a third-order cross-coupled one operating at 12 and 15 GHz with the same FBWs, and a fourth-order cross-coupled one operating at 12 and 17 GHz with the FBW ratio of 0.6 are designed and fabricated to demonstrate the method.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2017.2694827