Accurate RFI Prediction of 3D Non-Planar Connector with Half Magnetic Dipole Pattern


In this paper, a dipole-moment based reciprocity method is applied to a consumer electronic device. The dipole moment is then used to predict radio-frequency interference (RFI) from a high-speed connector to two nearby RF antennas. The connector has a 3D structure with data pins verticallyoriented, for which the near H field pattern around the connector shows a half magnetic dipole pattern. This is different from typical complete dipole patterns over planar printed PCB (printed circuit board) structures. To tackle this problem, a magnetic dipole is placed in full-wave simulation with a similar connector structure. Using the reference near field data from simulation an equivalent magnetic dipole moment for the measured field is obtained. Further reciprocity theorem is applied to predict RFI based on the equivalent dipole magnitude and the antenna reverse H field. The predicted RFI shows a fairly good match with the measured RFI for both victim antennas.

Meeting Name

2019 Joint International Symposium on Electromagnetic Compatibility, Sapporo and Asia-Pacific International Symposium on Electromagnetic Compatibility, EMC Sapporo/APEMC 2019 (2019: Jun. 3-7, Sapporo, Japan)


Electrical and Computer Engineering

Research Center/Lab(s)

Electromagnetic Compatibility (EMC) Laboratory


This material is based upon work supported partially by the National Science Foundation under Grant No. IIP-1440110.

Keywords and Phrases

Dipole Moment; Half Dipole Pattern; High-Speed Connector; Near-Field Scanning; Radio-Frequency Interference; Reciprocity

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2019 Institute of Electronics, Information and Communication Engineer, All rights reserved.

Publication Date

01 Jun 2019