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Most practical electromagnetic interference (EMI) sources are too complex—or even impossible—to model accurately using 3D full-wave simulation due to unknown internal structures. Electromagnetic source reconstruction offers a solution by creating a digital twin: an equivalent source that replicates the real source’s radiated near-field.
According to IEC 62433-3, an array of electromagnetic dipoles can serve as this equivalent source for EMI in IC packages. This talk explores methods for constructing such models. For near-field data with phase, least-squares and regularization algorithms are used. For phaseless data, dynamic differential evolution (DDE) and iterative techniques are applied.
The spatial distribution and types of equivalent dipoles can reveal key characteristics of the original EMI source, aiding in debugging and analysis.
These models also support:
- Field phase retrieval from phaseless near-field scans
- Prediction of near-field coupling to nearby circuits
- Coupling analysis between devices within shielded enclosures
- Noise coupling estimation using the reciprocity theorem
- Far-field prediction (e.g., 3-meter emissions) from ICs and packages
This approach enhances EMI modeling accuracy and provides valuable insights for electromagnetic compatibility (EMC) design and diagnostics.
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