Microstrip differential passband filter with high common-mode suppression using periodically loaded stubs and coupled resonators
- Author(s): Amir Attar 1 and Mojtaba Joodaki 1
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View affiliations
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Affiliations:
1:
Department of Electrical Engineering , Ferdowsi University of Mashhad , Mashhad , Iran
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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
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.
Inspec keywords: band-pass filters; periodic structures; microwave resonators; resonator filters; interference suppression; microwave filters; microstrip lines; microstrip filters
Other keywords: periodically loaded stubs; open-ended stubs; design procedure; common-mode noise suppression; periodic structure; differential fractional bandwidth; differential input signals; microstrip differential passband filter; short-ended stubs; three-unit-cell structure; differential in band insertion loss; unit cell; common-mode rejection ratio; frequency 7.0 GHz; coupled resonators; differential-mode excitation; centre frequency; Rogers RO4003 substrate; high common-mode suppression; microwave frequency bands
Subjects: Electromagnetic compatibility and interference; Passive filters and other passive networks; Waveguide and microwave transmission line components
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