Common-Mode Filters with Interdigital Fingers for Harmonics Suppression and Lossy Materials for Broadband Suppression
Common-mode (CM) noise on differential microstrip lines can be suppressed by PCB-embedded filters. These filters use resonating or broadband structures such that only the field from the CM signal couples to them. Based on a quarter-wavelength resonator, a new PCB filter is designed having an electrical size of only 0.15 λ × 0.065 λ, where λ is the effective wavelength in the CM filter. Its interdigital structure is also capable of suppressing higher order harmonics of the CM signal and can be used for USB 3.0 to mitigate electromagnetic interference. Further, a novel broadband suppression structure is described that uses magnetically lossy material to suppress the CM signal from 4.6 to 20 GHz without strongly affecting the intended differential signal.
Q. Liu et al., "Common-Mode Filters with Interdigital Fingers for Harmonics Suppression and Lossy Materials for Broadband Suppression," IEEE Transactions on Electromagnetic Compatibility, vol. 57, no. 6, pp. 1740-1743, Institute of Electrical and Electronics Engineers (IEEE), Dec 2015.
The definitive version is available at http://dx.doi.org/10.1109/TEMC.2015.2443126
Electrical and Computer Engineering
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Electromagnetic pulse; Organic pollutants; Polychlorinated biphenyls; Broadband structures; Common-mode filters; Differential signal; Effective wavelength; Harmonics suppression; Higher order harmonics; Interdigital structures; Quarter wavelength resonator; Signal interference; Broadband filter; narrowband filter
International Standard Serial Number (ISSN)
Article - Journal
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