Radio-Frequency Interference Estimation using Equivalent Dipole-Moment Models and Decomposition Method Based on Reciprocity


In modern electronic products, the noise from high-speed digital parts is likely to interfere with nearby receivers, causing radio-frequency interference (RFI) issues. In this paper, the equivalent dipole-moment models and a decomposition method based on reciprocity theory are proposed being used together to estimate the coupling from the noise source to the victim antennas. The dipole-moment models are extracted from the near fields of the noise source by solving the inverse problem. The tangential electromagnetic fields on a Huygens's surface, which enclose the victim antenna, can be calculated from these equivalent dipole-moment models. Then, the victim antenna only is treated as a radiator. The tangential electromagnetic fields from the radiating antenna on the same Huygens's surface can be obtained. With these two groups of the fields on the Huygens's surface, the reciprocity theory is applied to estimate the coupling from the noise source to the victim antenna. This method is validated by full-wave simulations and measurements of a simple printed circuit board. The proposed method provides convenience to estimate RFI issues in the early design stage and saves the time of RFI simulation and measurements.


Electrical and Computer Engineering

Research Center/Lab(s)

Center for High Performance Computing Research

Second Research Center/Lab

Electromagnetic Compatibility (EMC) Laboratory


This paper is based upon work supported in part by the National Science Foundation under Grant IIP-1440110

Keywords and Phrases

Antennas; Digital radio; Dipole moment; Electromagnetic fields; Frequency estimation; Partial discharges; Printed circuit boards; Printed circuits; Radio interference; Radio waves; Decomposition methods; Early design stages; Electronic product; Full-wave simulations; Radiating antennas; Radio frequency interference; Reciprocity theory; Simulations and measurements; Inverse problems; equivalent dipole-moment models

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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© 2016 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Feb 2016