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Signal-Interference Stepped-Impedance-Line Microstrip Filters and Application to Duplexers

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3 Author(s)
Gómez-García, R. ; Dept. of Signal Theor. & Commun., Univ. of Alcala, Alcala de Henares, Spain ; Munoz-Ferreras, J. ; Sánchez-Renedo, M.

In this letter, signal-interference filtering sections shaped by two in-parallel stepped-impedance transmission lines are applied to frequency-asymmetrical microstrip filter design. When realizing single-passband filters, a different selectivity for the lower and upper stopband can be generated, making them appropriate for duplexing devices. In the case of double-passband filters, fully-asymmetrical dual bands in terms of bandwidth, cutoff slopes and class of filtering transfer function can be shaped. Examples of design curves to adjust the performances of the synthesized signal-interference section filtering profile are given, e.g., bandwidth or in-band ripple level for Chebyshev-type functions. To show practical viability, a duplexer and a spectrally-asymmetrical dual-passband filter circuit are also built and characterized.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:21 ,  Issue: 8 )

Date of Publication:

Aug. 2011

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