Electromagnetic Engineering

An electronic device may work normally on a test bench yet malfunction once it is installed near motors, transmitters, switching power supplies, cables, or other electromagnetic sources. An Electromagnetic Engineering Expert Witness with experience relevant to the frequency range, equipment, electromagnetic environment, and EMC methods at issue can examine field measurements, EMC test results, circuit layouts, cable routing, grounding and bonding, shielding, equipment specifications, and operating records to evaluate potential electromagnetic sources, coupling paths, and effects on the system.

The analysis may involve electromagnetic interference, susceptibility, radiated or conducted emissions, capacitive or inductive coupling, or shielding performance. The expert can trace technically plausible sources and coupling paths, compare laboratory test conditions with the documented operating environment, and assess whether electromagnetic effects are consistent with the disputed equipment behavior while accounting for alternative electrical, electronic, control-system, or communication-related explanations.

Review of Case Materials

Reviews records, documents, testimony, data, and other relevant materials and consults with counsel regarding technical issues related to the matter.

Provide Expert Analysis

Applies specialized knowledge and experience to evaluate the technical or professional issues involved.

Form Expert Opinions

Develops independent, supportable opinions based on the available evidence and relevant standards.

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Frequently Asked Questions

What is the difference between electromagnetic compatibility and electromagnetic interference?

Electromagnetic interference, or EMI, is an unwanted electromagnetic disturbance that can degrade or disrupt the performance of electrical or electronic equipment. Electromagnetic compatibility, or EMC, refers to the ability of equipment or systems to operate satisfactorily in their intended electromagnetic environment without causing unacceptable electromagnetic disturbance to other equipment. An EMC analysis may therefore examine emissions from a source, the susceptibility or immunity of affected equipment, the coupling path between them, or a combination of these factors.

How do engineers determine how electromagnetic interference reached affected equipment?

Engineers evaluate the possible coupling paths between a suspected interference source and the affected equipment. Disturbances may travel through shared power, signal, grounding, or other conductive paths; couple through electric or magnetic fields; or propagate as radiated electromagnetic energy. The significance of each mechanism depends on factors such as frequency, distance, cable and circuit geometry, grounding and bonding, shielding, source characteristics, and equipment susceptibility. Measurements, signal analysis, and controlled testing can help determine which source and coupling path are consistent with the observed behavior.

How is electromagnetic shielding effectiveness evaluated?

Electromagnetic shielding effectiveness is evaluated by measuring how much a material, enclosure, cable shield, or other barrier reduces electromagnetic fields or conducted signals under defined test conditions. Relevant factors may include frequency, shielding material, bonding, seams, apertures, connectors, penetrations, cable terminations, enclosure geometry, and the measurement method used. Because shielding performance can vary significantly with frequency and configuration, a single shielding-effectiveness value should not be assumed to represent every installation or operating condition.