Analysis and procedure to design differential wideband filters with high-selectivity and high common-mode suppression

This paper proposes a new structure to design differential wideband bandpass filters by cascading two different types of wideband bandpass filters. Detailed analysis to obtain the equations for designing differential filters with high selectivity and fractional bandwidths between 20 and 55% is prese...

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Bibliographic Details
Published in:Journal of electromagnetic waves and applications 2016-11, Vol.30 (17), p.2334-2343
Main Authors: Cruz-Pérez, Elizabeth, Olvera-Cervantes, José L., Corona-Chávez, Alonso
Format: Article
Language:English
Subjects:
Balanced filters
bandpass filter
common mode rejection
high selectivity
microstrip
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Summary:This paper proposes a new structure to design differential wideband bandpass filters by cascading two different types of wideband bandpass filters. Detailed analysis to obtain the equations for designing differential filters with high selectivity and fractional bandwidths between 20 and 55% is presented. To complement the equations a design methodology is proposed and two prototypes with different bandwidth are designed, simulated, and fabricated. The measurement results under differential mode show that the designed filters present two transmission zeros, constant insertion losses, return losses greater than  dB and a stop band of at least 2.5 . On the other hand, the common-mode signals are suppressed below  dB in the whole passband.
ISSN:0920-5071
1569-3937
DOI:10.1080/09205071.2016.1246979