Electromagnetic radiation resulting from two signal traces on a printed circuit board

Yoshiki Kayano, Motoshi Tanaka, Hiroshi Inoue

    Research output: Contribution to journalArticlepeer-review


    To provide basic considerations for the realization of methods for predicting the electromagnetic (EM) radiation from a printed circuit board (PCB) with plural signal traces driven in the even-mode, the characteristics of the EM radiation resulting from two signal traces on a PCB are investigated experimentally and by numerical modeling. First, the frequency responses of common-mode (CM) current and far-electric field as electromagnetic interference (EMI) are discussed. As the two traces are moved closer to the PCB edge, CM current and far-electric field increase. The frequency responses in the two signal trace case can be identified using insights gained from the single trace case. Second, to understand the details of the increase in CM current, the distribution of the current density on the ground plane is calculated and discussed. Although crosstalk ensues, the rule for PCB design is to keep two high-speed traces on the interior of the PCB whenever possible, from the point of view of EM radiation. Finally, an empirical formula to quantify the relationship between the positions of two traces and CM current is provided and discussed by comparing four different models. Results calculated with the empirical formula and finite-difference time-domain (FDTD) modeling are in good agreement, which indicates the empirical formula may be useful for developing EMI design guidelines.

    Original languageEnglish
    Pages (from-to)1217-1223
    Number of pages7
    JournalIEICE Transactions on Electronics
    Issue number8
    Publication statusPublished - 2006 Aug


    • Common-mode
    • Differential-mode
    • Electromagnetic radiation
    • Plural signal traces
    • Printed circuit board

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering


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