A Novel Microstrip Symmetric Diagonal Cross-Coupling Quadruplet Bandpass Filter Using Even/Odd- Mode Stepped Impedance Resonators

In this paper, a novel symmetric quadruplet coupling scheme for two symmetric/asymmetric transmission zeros (TZs) is introduced, and its new symmetric microstrip filter is proposed for a bandpass filter (BPF) design having high skirt selectivity at passband and high attenuation at stopband. In conve...

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Bibliographic Details
Published in2018 IEEE/MTT-S International Microwave Symposium - IMS pp. 712 - 715
Main Authors Mikase, Ryo, Ohira, Masataka, Ma, Zhewang, Wang, Xiaolong
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2018
Subjects
Attenuation
Band-pass filters
Bandpass filters
coupling matrix
Couplings
Microstrip
quadruplet
Resonant frequency
Resonators
Transmission line matrix methods
transmission zeros
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Summary:In this paper, a novel symmetric quadruplet coupling scheme for two symmetric/asymmetric transmission zeros (TZs) is introduced, and its new symmetric microstrip filter is proposed for a bandpass filter (BPF) design having high skirt selectivity at passband and high attenuation at stopband. In conventional quadruplets such as box section, two TZs are hard to produce at arbitrary frequencies owing to their coupling schemes and physical structures. The quadruplet employed in the paper is simply realized by a symmetric microstrip structure using even/odd-mode stepped impedance resonators (SIRs) and quarter-wavelength resonators (QWRs), thereby intrinsically generating a negative coupling required for two prescribed TZs. Moreover, the combination of SIRs and QWRs leads to a wide, high attenuation stopband response due to the suppression of direct source/load coupling as well as spurious resonances. The validity of the proposed BPF is proved through design and measurement of a 2-GHz fourth-order BPF with two TZs.
ISSN:2576-7216
DOI:10.1109/MWSYM.2018.8439291