Generation and Propagation of Common-Mode Currents in a Balanced Two-Conductor Line

Based on the transmission line theory, modal transformation is applied to a balanced two-conductor line connected to a signal source and a load, which yields an equivalent circuit expressed in differential and common modes. This newly developed equivalent circuit clearly shows that the common-mode c...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2012-04, Vol.54 (2), p.466-473
Main Authors: Sugiura, A., Kami, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Balancing
BPL
common mode
Computer simulation
Conversion
differential mode
Electrical engineering. Electrical power engineering
Electrical power engineering
Electromagnetic compatibility
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Equations
Equivalent circuits
Exact sciences and technology
Feeders
Focusing
Integrated circuits
Joints
LCL
Mathematical model
Miscellaneous
Moment methods
PLC
PLT
power line
Power networks and lines
Power transmission lines
Studies
Switching and signalling
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transformations
transmission line
Transmission line theory
Users connections and in door installation
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Summary:Based on the transmission line theory, modal transformation is applied to a balanced two-conductor line connected to a signal source and a load, which yields an equivalent circuit expressed in differential and common modes. This newly developed equivalent circuit clearly shows that the common-mode currents on a balance two-conductor line are generated by (1) direct injection of the common-mode current by a connected RF source; (2) multiple mode conversions by the source and load; and (3) multiple reflections of the modal currents at the source and load. The effects of branch lines connected to the feeder line are also investigated, focusing on generation of the common-mode current. It is concluded that the common-mode currents are also generated by (4) series connection of a branch line. Particularly, in the case of a switching branch line, the connection of a feeder line makes the branch line imbalanced, resulting in the common-mode current in the branch line. The aforementioned theoretical findings are compared with computer simulation using the method of moments with the numerical electromagnetic code (NEC2).
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2011.2162523