%0 Electronic Article
%A Amir Attar
%A Mojtaba Joodaki
%K differential fractional bandwidth
%K differential-mode excitation
%K three-unit-cell structure
%K common-mode noise suppression
%K common-mode rejection ratio
%K Rogers RO4003 substrate
%K differential input signals
%K design procedure
%K unit cell
%K short-ended stubs
%K frequency 7.0 GHz
%K differential in band insertion loss
%K open-ended stubs
%K periodically loaded stubs
%K coupled resonators
%K high common-mode suppression
%K microwave frequency bands
%K microstrip differential passband filter
%K centre frequency
%K periodic structure
%X 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.
%T Microstrip differential passband filter with high common-mode suppression using periodically loaded stubs and coupled resonators
%B The Journal of Engineering
%D April 2018
%V 2018
%N 4
%P 242-247
%I Institution of Engineering and Technology
%U https://digital-library.theiet.org/;jsessionid=1hqep2k0jgv0u.x-iet-live-01content/journals/10.1049/joe.2017.0903
%G EN