PCB structures for common mode suppression on differential microstrip lines

Liu, Qian; Xu, Sheng; Pommerenke, David

doi:10.1109/isemc.2014.6899029

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…In terms of the microstrip line, [8] achieves a 740 MHz 3‐dB stopband by etching specific patterns on the ground plane below the differential lines. [26] with around 200 MHz 3‐dB stopband width employs ground via. As for stripline, [21] demonstrates around 1.8 GHz 3‐dB stopband width by etching the ground plane.…”

Section: Measurement Resultsmentioning

confidence: 99%

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An alternating high‐low impedance common‐mode filter for differential striplines

Song

Wei

Gao

2021

IET Microwaves Antenna & Prop

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The conventional quarter/half-wavelength common-mode filter (CMF) cannot work well for a differential stripline when there is no ground via. A new and effective viafree CMF design for the differential striplines is proposed in this study. An alternating high-low impedance structure is developed to increase the coupling between the stripline and the CMF, thus achieving a good filtering effect. A cascaded CMF design is further studied to enhance the stopband without deterioration of the differential signals. Both simulation and measurement results demonstrate the effectiveness of the proposed high-low impedance CMF. The significant advantage of the proposed CMF is its compactness and simplicity, which has almost no impact on the original layout of differential striplines.

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Section: Measurement Resultsmentioning

confidence: 99%

“…The grounding vias are usually required in the quarter/ half-wavelength shorted stripline CMF [26]. However, the dense and compact circuit design in practical PCBs results in little space left for such grounding vias.…”

mentioning

confidence: 99%

An alternating high‐low impedance common‐mode filter for differential striplines

Song

Wei

Gao

2021

IET Microwaves Antenna & Prop

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“…In order to suppress the noise at both odd and even harmonic frequencies, an interdigital resonator based on this CM filter was designed with dimensions shown in Fig. 2 [9]. The interdigital fingers increase the capacitance from the resonator to the ground plane; thus, decreasing the electric size of the resonator.…”

Section: Narrowband CM Suppression Filtermentioning

confidence: 99%

Common-Mode Filters With Interdigital Fingers for Harmonics Suppression and Lossy Materials for Broadband Suppression

Liu

Pommerenke

2015

IEEE Trans. Electromagn. Compat.

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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.Index Terms-Broadband filter, common-mode filter, differential signal, quarter-wavelength, narrowband filter.

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Attenuation of an ultrashort pulse in a folded meander microstrip line with two passive conductors

Malygin,

Nosov,

Kim

2024

Circuit Theory & Apps

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SummaryIn this article, we investigated a new structure of a protective meander line (ML): a meander microstrip line (MSL) with two passive conductors. The existing theory of ultra‐short pulse (USP) attenuation in MLs is presented for the first time. Based on this theory, we determined the number of decomposed pulses at the output of the MSL line with two passive conductors, and, for the first time, formulated the conditions for pulse decomposition in the line. The folding of the MSL line into non‐core turns was studied in detail. As a result of this article, we proposed a new theory that involves the utilization of additional groups of decomposed pulses for enhanced USP attenuation. These additional groups were thoroughly examined, and the delays of pulses from these groups were defined. This analysis allowed identifying the reason for their appearance. It was revealed that folding the ML into non‐core turns allows further attenuation of the USP amplitude, which increases with the increase of the number of non‐core turns. To validate the obtained simulation results, we performed experimental measurements and obtained good consistency of the results. The N‐norms analysis demonstrated that the combined use of such folding and passive conductors reduces the probability of electrical breakdown, arc discharge, and dielectric breakdown. The maximum USP attenuation at the output was 24.9 dB. As a result of useful signal integrity analysis, it is proposed to use a folded MSL together with a USB 2.0 “Full‐speed” interface with a data transfer rate of 12 Mbit/s. In addition, it is proposed to use such MSLs in DC power circuits.

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PCB structures for common mode suppression on differential microstrip lines

Cited by 10 publications

References 9 publications

An alternating high‐low impedance common‐mode filter for differential striplines

An alternating high‐low impedance common‐mode filter for differential striplines

Common-Mode Filters With Interdigital Fingers for Harmonics Suppression and Lossy Materials for Broadband Suppression

Attenuation of an ultrashort pulse in a folded meander microstrip line with two passive conductors

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