Microstrip differential passband filter with high common-mode suppression using periodically loaded stubs and coupled resonators

Amir Attar; Mojtaba Joodaki

Microstrip differential passband filter with high common-mode suppression using periodically loaded stubs and coupled resonators

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Author(s): Amir Attar¹ and Mojtaba Joodaki¹
- Affiliations: 1: Department of Electrical Engineering , Ferdowsi University of Mashhad , Mashhad , Iran
Source: Volume 2018, Issue 4, April 2018, p. 242 – 247
DOI: 10.1049/joe.2017.0903 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)

Received 25/12/2017, Accepted 28/01/2018, Published 12/02/2018

In this study, a periodic structure as a passband filter for differential input signals is introduced that suppresses the common-mode noise with a high common-mode rejection ratio on a wide range of frequencies. The unit cell of the periodic structure consists of open-ended stubs under common-mode and short-ended stubs under differential-mode excitation. The proposed design procedure introduced in this paper can be exploited for different microwave frequency bands while the overall shape of the filter remains unchanged. To verify the design approach, the authors designed and fabricated a filter at the centre frequency of 7 GHz on a Rogers RO4003 substrate with a dielectric constant of 3.7 and a loss tangent of 0.0027. Their studies show that for a three-unit-cell structure with the overall size of 18 mm × 40 mm (0.75λ _g × 1.66λ _g), a differential fractional bandwidth of 8.6% and a rejection ratio over 55 dB are achieved while the differential in band insertion loss is around 2 dB.

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Microstrip differential passband filter with high common-mode suppression using periodically loaded stubs and coupled resonators

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