Identifying the Frequency Response of Common-Mode Current on a Cable Attached to a PCB

Yoshiki KAYANO  Motoshi TANAKA  Hiroshi INOUE  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.8   pp.1268-1276
Publication Date: 2004/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on IS-EMD2003--Recent Technical Trend of Electro-Mechanical Devices)
Category: Measurement and Evaluation
common-mode current,  unbalance,  frequency response,  electromagnetic interference,  PCB,  

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Common-mode (CM) current on a feed cable attached to printed circuit board (PCB), which is one of main source of undesired electromagnetic radiation problem, is investigated by experimental and finite-difference time-domain (FDTD) modeling. In this paper, frequency responses of CM current on PCB and feed cable are modeled and analyzed as an electromagnetic interference (EMI) antenna, which depends on the configuration of PCB with a wire cable. Several different configurations are prepared to demonstrate the effect of PCB dimension on resonance frequencies of CM current. In the results, EMI antenna in the frequency band around the first resonance frequency was comprised of the ground plane and cable. In order to explain the frequency response of CM current, two EMI antenna models are proposed and demonstrated. EMI antenna is comprised of the ground plane and cable, and the other EMI antenna is comprised of the trace on the ground plane. It is suggested that the result is one of basic consideration for the ground plane with cable that have high EMI problem and resonance frequency of CM current.