Design and Synthesis of Quasi Dual-mode, Elliptic Coaxial Filter

This article introduces the design of a novel quasi dual-mode, elliptic coaxial filter. The transfer function is mapped to a generalized Chebyshev prototype with symmetrically located transmission zeros (TZs) where the coupling values are extracted. Furthermore, the miniaturization is achieved by in...

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Bibliographic Details
Published inRadioengineering Vol. 24; no. 3; pp. 795 - 799
Main Authors Cheab, Sovuthy, Wong, Peng Wen
Format Journal Article
LanguageEnglish
Published Spolecnost pro radioelektronicke inzenyrstvi 01.09.2015
Subjects
Bandpass filter
coaxial filter
elliptic
quasi dual-mode
source-load coupling
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Summary:This article introduces the design of a novel quasi dual-mode, elliptic coaxial filter. The transfer function is mapped to a generalized Chebyshev prototype with symmetrically located transmission zeros (TZs) where the coupling values are extracted. Furthermore, the miniaturization is achieved by incorporating stepped-impedance coaxial line with inductive element shunted at the center to exhibit a quasi dual-mode property. Theoretical analysis together with experimental prototype is presented. The center frequency of the filter is 2.7 GHz. The simulated and measured insertion loss/return loss are 1.2 dB/ 15 dB and 2.5 dB/11.5 dB respectively. Both theoretical and measured results show a very good agreement.
ISSN:1210-2512
DOI:10.13164/re.2015.0795