Design of wide band-pass substrate integrated waveguide (SIW) filters based on stepped impedances
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The authors gratefully acknowledge financial support from Ministerio de Economía y Competitividad of Spain, Fundación Séneca of Región de Murcia and the European Regional Development Funds for the financial support (grant no.: TEC2016-75934-C04-4-R and PRX18/00092).Publication date
2019-02Publisher
ElsevierBibliographic Citation
MÁXIMO-GUTIÉRREZ, Clara, HINOJOSA, Juan, et ALVAREZ-MELCON, Alejandro. Design of wide band-pass substrate integrated waveguide (SIW) filters based on stepped impedances. AEU-International Journal of Electronics and Communications, 2019, vol. 100, p. 1-8.Peer review
siKeywords
Band-pass filterFilter synthesis
Substrate integrated waveguide (SIW)
Abstract
A full-wave design technique of n-order Chebyshev stepped impedance band-pass filters in substrate integrated waveguide (SIW) is presented for the first time. The structure of the filter is based on including elliptic patterns etched on the SIW top surface to synthesize Chebyshev transfer functions. The band-pass response is obtained from the high-pass characteristic of the SIW line together with the behavior of the elliptic patterns, which implement the impedance inverters needed to control an upper cut-off frequency in the response of the filter. The synthesis technique is applied to the design of a sixth-order Chebyshev stepped impedance band-pass SIW filter. It is shown that the use of elliptic patterns instead of circular patterns can increase the spurious free range of the filter. In addition, when exponential microstrip-to-SIW transitions are integrated into the design process, a reduction in size and improvement in return loss are achieved, as compared to a base-line filter ...
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